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151. Initial stages of structurization in dilute solutions of polyamic acids and polyimides

Author

N.V. Mikhailova, V.Ye. Eskin, I.A. Baranovskaya, Yu. G. Baklagina, V. V. Kudryavtsev, N.V. D'yakonova, A. V. Sidorovich, M.M. Koton, and V. P. Sklizkova

Subjects
Diffraction, Chemistry, Polymer chemistry, Intermolecular force, General Engineering, Infrared spectroscopy, Physical chemistry, Light scattering
Abstract

By means of IR spectroscopy, light scattering, and X-ray diffraction, strong intermolecular interactions have been found to exist in dilute solutions (at concentrations c ⩾ 0·5%) of polyamic acids and of soluble polyimides in amidic solvents.

Published
1986
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152. Experimental and theoretical study of the effect of medium on chemical imidization

Author

V. V. Kudryavtsev, Vladimir A. Zubkov, M.M. Koton, A. V. Yakimanskii, Tamara K. Meleshko, and N. N. Bogorad

Subjects
chemistry.chemical_compound, Acetic anhydride, Deprotonation, chemistry, Pummerer rearrangement, Amide, Polymer chemistry, Pyridine, General Engineering, Organic chemistry, Protonation, Trifluoroacetic anhydride, Imide
Abstract

Solid poly(4,4′-oxydiphenylenepyromellitamic acid) was treated in benzene by a mixture of pyridine and acetic and/or trifluoroacetic anhydride. The kinetics of transformation of polyamic acid into a copolymer containing imide and isoimide rings was studied by IR spectroscopy. Imide groups are predominantly formed in the presence of acetic anhydride whereas isoimide structures are favoured in the presence of trifluoroacetic anhydride. The effects of a different content of pyridine and of mixtures consisting of acetic and trifluoroacetic anhydride in the reaction medium on the composition of the resulting copolymers was investigated. The experimental results have been explained using quantum chemical calculations of reaction pathways in the cyclization of amic acids. The preferred formation of either imide or isoimide rings has been explained by the ability of different reaction media to favour deprotonation of the amide group or protonation of carboxyls in polyamic acids.

Published
1984
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153. Molecular weight chromatographic analysis of polyamic acids synthesized from p-phenylene diamine and 3,3′,4,4′-diphenyloxide tetracarboxylic dianhydride

Author

M.M. Koton, V. P. Sklizkova, O.I. Kurenbin, M.A. Lazareva, V. V. Kudryavtsev, and P.P. Nefedov

Subjects
chemistry.chemical_compound, Chromatography, Column chromatography, Molecular mass, Linear range, Chemistry, Phenylene, Diamine, General Engineering, Molar mass distribution
Abstract

Methods were developed for determining molecular weight distribution (MWD) of polyamic acids obtained from p-phenylenediamine and 3,3′,4,4′-diphenyloxide tetracarboxylic dianhydride by exclusion liquid chromatography. The methods involve chromatographic analysis using a system of columns with a linear range of separation for polystyrenes of 103–106 MW in a N,N-dimethylformamide/THF eluent and LiBr and H3PO4 additives, 0·03 m each, which suppress distortion of resulting MWDs, and determination of the calibration dependence of V = f(logM) for polydispersed samples according to intrinsic viscosities, average molecular weights using universal calibration. Liquid chromatography enables MWD of polyamic acids synthesized in solvents different from the eluent to be analysed.

Published
1981
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155. Chromatographic study of solutions of poly-(4,4′-oxydiphenylene) pyromellitamic acid

Author

V. V. Kudryavtsev, Tatiana B. Tennikova, L.Z. Vilenchik, N. G. Bel'nikevich, S.Ya. Frenkel, V.V. Nesterov, B.G. Belen'kii, M.M. Koton, and V. P. Sklizkova

Subjects
chemistry.chemical_compound, Chromatography, Monomer, Chemistry, General Engineering, Analytical chemistry, Projection (linear algebra), Macromolecule
Abstract

The method of liquid chromatography has given the mean molecular characteristics of solutions of poly-(4,4′-oxydiphenylene pyromellitamic acid in the MM interval 2×104−2·25 × 105. An analytical expression has been obtained relating the constants of the Mark-Kuhn-Houwinck equation to such macromolecular parameters as the length of the Kuhn statistical segment, the mass of the monomer unit and the length of its projection on the direction of the extended trans-chain.

Published
1985
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156. The effect of the nature of the amide solvent on the molecular characteristics of poly-(4,4′-oxydiphenylene) pyromellitimido-acid

Author

V. V. Kudryavtsev, O.V. Kallistov, I. G. Silinskaya, M.M. Koton, and V. P. Sklizkova

Subjects
Solvent, chemistry.chemical_compound, Molecular mass, Chemistry, Intrinsic viscosity, Amide, Polymer chemistry, General Engineering, Molar mass distribution, Physical chemistry, Light scattering, Macromolecule
Abstract

Measurements have been made of the intrinsic viscosity and weight average molecular weight (light scattering) of unprecipitated specimens of poly-(4,4′-oxydiphenylene) pyromellitimido-acid in amide-type solvents. On the basis of these data, the parameters in the Mark-Kuhn-Houwink equation have been calculated. A comparative assessment has been made of the thermodynamic quality of the solvents used and an interconnection between thermodynamic quality and the molecular mass of the specimens synthetized has been noted. In all the solvents, the unperturbed dimensions of the macromolecular coil is 1·1±0·1 A and the size of the Kuhn segment is 30±5 A.

Published
1979
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157. Chromatographic study of reaction kinetics of formation and degradation of polyamido acid

Author

Tatiana B. Tennikova, L.Z. Vilenchik, M.M. Koton, V. P. Sklizkova, N. G. Bel'nikevich, V. V. Kudryavtsev, S.Ya. Frenkel, and B.G. Belen'kii

Subjects
Chemical kinetics, Chromatography, Reaction rate constant, Chemistry, Kinetics, Degradation (geology), General Chemistry
Abstract

1. The kinetics of the formation and aging of poly(4,4′-hydroxydiphenylene)pyrromellitamido aeid were studied by chromatography. 2. The rate constants of the basic reactions comprising the process, determined from the kinetic data, agree with the values obtained by other methods.

Published
1985
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158. Investigation of the thermal cyclization of functional derivatives of poly(amido acids)

Author

Tamara K. Meleshko, V. V. Kudryavtsev, M.M. Koton, and V. P. Sklizkova

Subjects
chemistry.chemical_classification, Reaction rate, chemistry.chemical_compound, Reaction rate constant, chemistry, Chemical structure, Thermal, General Engineering, Organic chemistry, Ammonium, Polymer
Abstract

A study was made of the thermal cyclization (imidization) of functional derivatives of poly-(4-4′-hydroxyphenylene)pyromellitamic acid, namely substituted ammonium salts of the latter, the ethyl and phenyl esters, N-methyl- and N-phenylamides, and also polyisoimide. The functional derivatives were prepared by reactions in the poly(amido acid) chains. The rate constants and activation energies were calculated for imidization. Changes occurring in the deformation-strength properties of the polymers during heat treatment were determined. A relationship between reaction rates and the chemical structure of the derivatives was found as well as evidence to show that the level of the properties of the obtained polyimides is dependent on the nature of the low molecular products formed in the cyclization processes.

Published
1975
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160. Study of properties of poly-(4,4′-hydroxydiphenylene) pyromellitic amido-acid and its esters in solutions

Author

V. V. Kudryavtsev, I.A. Baranovskaya, M.M. Koton, V. P. Sklizkova, and V.Ye. Eskin

Subjects
chemistry.chemical_classification, chemistry, Intrinsic viscosity, Steric factor, Polymer chemistry, General Engineering, Viscometer, Molar mass distribution, Degradation (geology), chemistry.chemical_element, Polymer, Oxygen, Light scattering
Abstract

Light scattering and viscometry were used to examine properties of solutions of poly-(4,4′-hydroxydiphenylene)pyromellitic amido-acid (PAA PM) and methyl and ethyl esters in DMAA and DMF. Esters were obtained by reactions in PAA PM chains. It was shown that storing PAA PM solutions and esters obtained by reactions in PAA chains, the weight average molecular weight of polymers is reduced, which is evidence of the validity of the degradation mechanism of ageing PAA in solutions. For PAA PM in DMAA and mixture of DMAA: dioxane (1:2·5) equations were derived which relate intrinsic viscosity with molecularly weight. Using the Stockmayer-Fixman extrapolation method for PAA PM unperturbed dimensions of molecular spheres were determined in solution. From the value of (h02/M)13 and the steric factor σ it was concluded that there is practically no rotation around ester oxygen bridges.

Published
1976
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161. Investigation of process of polyimide formation from complexes of diester of benzophenonetetracarboxylic acid with diamines. 1. Investigation of thermal imidization by means of IR spectroscopy

Author

E. N. Kukarkin, V. V. Kudryavtsev, E. A. Smirnova, M.M. Koton, V. N. Artem'eva, N.V. Mikhailova, and G. V. Lyubimova

Subjects
chemistry.chemical_compound, chemistry, Diffusion, Kinetics, Polymer chemistry, Infrared spectroscopy, Reactivity (chemistry), General Chemistry, Activation energy, Imide, Photochemistry, Prepolymer, Polyimide
Abstract

The thermal imidization of complexes of benzophenonetetracarboxylic acid diester with diamines is greatly different from the thermal imidization of the corresponding mechanical mixtures. Preliminary complexation gives a considerably greater degree of completion of the imidization. It is concluded that diffusion processes play a decisive role in the solid-phase thermal imidization of the complexes. On the basis of similar values of the free energy of activation at identical temperatures for complexes with different diamines, it is concluded that the reactivity of the functional groups has little influence on the kinetics of solid-phase imidization of the complex. Alternative schemes are proposed for the formation of polyimides from the complexes, leading to an intermediate mixed-unit prepolymer with amido acid, amido ester, and imide units in the chain.

Published
1989
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162. Polyimides with ether-sulphone groups on the amino-component

Author

G. S. Mironov, V.Ye. Smirnova, V. V. Kudryavtsev, V.A. Ustinov, Ye.P. Aleksandrova, M.M. Koton, Valentin M. Svetlichnyi, Yu. A. Moskvichev, and T.A. Maricheva

Subjects
chemistry.chemical_classification, Acylation, chemistry.chemical_compound, Reaction rate constant, Softening point, Chemistry, Chemical structure, Polymer chemistry, General Engineering, Oxide, Reactivity (chemistry), Ether, Polymer
Abstract

The main features of the synthesis and properties of polyimides (PI) based on diamines which are the analogues of 4,4-bis-(aminophenoxy)diphenylsulphone have been studied. A feature of the chemical structure is a 4,4-diphenyl sulphone fragment linked to the aminophenoxy groups which contain an amino-radical group in 3- or 4-position relative to the oxygen atom. The efficiency of the phenoxy-radical insertion and the resulting reactivity increase of the amino groups has been assessed from the rate constants of the acylation with the 4,4,3,3-benzophenonetetracarboxylic acid dianhydride. The softening temperature and the deformation-strength characteristics have been used to discover what masking effect the diphenylsulphone (DPS) fragment has on the properties of polymers produced by using various tetracarboxylic acids. The relevant properties of the mono- and poly-compounds containing a 4,4-diphenyl oxide fragment linked with phenoxy groups have been examined for the purpose of comparisons.

Published
1980
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163. Optical heterogeneities of poly(acid)amide concentrates

Author

V. V. Kudryavtsev, M.M. Koton, V. P. Sklizkova, I. G. Silinskaya, L.M. Budanova, O.S. Karchmarchik, S.Ya. Frenkel, and Yu.V. Brestkin

Subjects
Condensation polymer, Materials science, General Engineering, Radius, Spectral line, chemistry.chemical_compound, Monomer, chemistry, Volume (thermodynamics), Chemical engineering, Amide, Polymer chemistry, Turbidity, Prepolymer
Abstract

The method of turbidity spectra has been used to determine the micron-size heterogeneities present in the prepolymer solutions used to synthesize polyimides (poly-(4,4-hydroxydiphenylene) pyromellitamides) produced by polycondensing the respective monomers in dimethyl fornamide. The proportion by volume of the heterogeneities present in the reaction solutions has been established to consist of admixtures entering with the monomers, and of polymer particles forming by secondary reactions during the polycondensation. The numbers of the heterogeneities per unit of volume and their average radius depend on the varying polycondensation conditions. The most significant and potential source of the heterogeneities is assumed to be the heterogenous distribution of the solid monomer in the space (bulk) of the reaction mixture.

Published
1981
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164. On the equilibrium flexibility of polyamic acids

Author

I.A. Baranovskaya, V. V. Kudryavtsev, V.Ye. Eskin, N.V. D'yakonova, M.M. Koton, and V. P. Sklizkova

Subjects
chemistry.chemical_classification, Intrinsic viscosity, Chemical structure, General Engineering, Viscometer, Ether, Polymer, chemistry.chemical_compound, chemistry, Phenylene, Amide, Steric factor, Polymer chemistry, Physical chemistry
Abstract

The equilibrium flexibility of polyamic acids has been investigated by means of light scattering and viscometry methods. The number, position and chemical structure of “hinge” groups in the studied polymers were varied, as well as the number of phenylene rings in the anhydride and amine parts of the chains. Experiments were conducted in thermodynamically good solvents, and in ideal ones. The relative unperturbed dimensions of the coils hθ2/M)12 were determined for all the studied polyamic acids (seven structures). It was found that the steric factor σ = (hθ2/hf2) approximates to unity for all these structures. Calculation of hf2 was carried out with an assumption that there is free rotation about ether bonds, and meta-addition of amide groups in the chain. Mark-Kuhn-Houwink equations were derived, relating the intrinsic viscosity [η] to the molecular weight Mw of the polyamic acids.

Published
1985
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165. Kinetic study of the formation of aromatic polyimides based on multinuclear bridge-containing aromatic diamines

Author

B.V. Chernitsa, N.G. Antonov, V. V. Kudryavtsev, A. I. Kol'tsov, V. M. Denisov, V. M. Svetlichnyi, and M.M. Koton

Subjects
Acylation, chemistry.chemical_compound, Aniline, chemistry, Nucleophile, Hammett equation, Kinetics, General Engineering, Substituent, Organic chemistry, Amine gas treating, Benzene, Medicinal chemistry
Abstract

A method of IR analysis was used in a kinetic study of reactions of dianhydrides of 1,3-bis-(3,4-dicarboxyphenoxy)benzene and 3,3′,4,4′-tetracarboxybenzophenone with aniline and its p-methyl-, p-phenoxy-, p-bromo-, p-nitro derivatives and tetranuclear bridge-containing diamines in N,N-dimethylacetamide (DMAA) at 298 K. A PMR study was made of the kinetics of cyclization of o-carboxyamides prepared from the dianhydride of 1,3-bis(3,3-dicarboxyphenoxy)benzene and the above-mentioned diamines in DMAA solution at 433 K. The effect of a substituent in the nucleophile (amine) on rates of acylation with tetracarboxylic dianhydrides is described by a Hammett equation with p=−3·6 and −3·4 respectively. The rate of cyclization is only slightly depend on the initial amine structure. The p value for cyclization of the model o-carboxyanilides is equal to −0·2. In the case of the studied flexible-chain polymers the rates of formation and cyclization of polyamic acids depend on factors relating to the electronic structure of the reacting functional groups.

Published
1986
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166. Effect of the thermodynamic quality of solvent on the viscosity properties of concentrated solutions of poly(4,4′-oxydiphenylene)pyromellitamic acid

Author

V. V. Kudryavtsev, N.G. Byel'nikevich, S.Ya. Frenkel, E.P. Dontsova, V.F. Blinov, M.M. Koton, V. P. Sklizkova, Z.V. Gerashchenko, and Yu.V. Zimin

Subjects
chemistry.chemical_classification, Intrinsic viscosity, Relative viscosity, General Engineering, Polymer, Toluene, Solvent, Viscosity, chemistry.chemical_compound, Rheology, chemistry, Chemical engineering, Organic chemistry, Solvent effects
Abstract

Molecular characteristics and rheological behaviour of solutions of poly(4,4′-oxydiphenyl)pyromellitamic acid in a mixture of DMFA (thermodynamically good solvent) with toluene (precipitant) were studied, at various solvent compositions up to that corresponding to a θ-solvent. It was shown that when the initial solutions are diluted by the precipitant, the viscosity of the solutions is independent of the thermodynamic quality of the solvent, and their intrinsic viscosity consequently decreases. A comparison of the rheological behaviour of polyamic acids synthesized in solvents of various thermodynamic quality has shown that the molecular mass of the formed polymer is the higher, the poorer the quality of the solvent.

Published
1988
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167. Equilibrium rigidity of macromolecules of poly(4,4′-phenylene)pyromellitamido acid

Author

M.M. Koton, V. P. Sklizkova, V. V. Kudryavtsev, T.I. Zhukova, I.A. Baranovskaya, S.Ya. Magarik, and V.Ye. Eskin

Subjects
Crystallography, Rigidity (electromagnetism), Birefringence, Materials science, Phenylene, Intrinsic viscosity, General Engineering, Hinge, Macromolecule
Abstract

From the value of the intrinsic viscosity in θ conditions and from the value of reduced dynamic birefringence the authors determine the equilibrium rigidity of non-hinge macromolecules of poly(4,4′-phenylene)pyromellitamido acid. They obtain the size of the statistical segment A=(60±10) × 10−10 which is twice the size of the segment of the macromolecules of poly(4,4′-oxydiphenylene)pyromellitamido acid similar in structure but with hinge articulation.

Published
1989
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168. The isomeric composition of poly(acid)amides according to 13C-NMR spectral data

Author

A. I. Kol'tsov, V. V. Kudryavtsev, V. M. Denisov, V.M. Svetlichnyi, Vladimir A. Zubkov, V. A. Gindin, and M.M. Koton

Subjects
chemistry.chemical_compound, Chemistry, Component (thermodynamics), Diamine, General Engineering, Organic chemistry, Composition (visual arts), Reactivity (chemistry), Carbon-13 NMR, Spectral data, Medicinal chemistry, Spectral line, Benzidine
Abstract

The complete decoding of the 13C-NMR spectra of poly-(acid)amides (PAA) produced by polycondensing some tetracarboxylic acid dianhydrides, i.e. those of pyromellitic, 3,4,3′,4′-diphenyloxy, 3, 4,3′, 4′-benzophenone, and 3,4,3′,4′-diphenyl, with p-phenylenediamine or benzidine, gave the proportions of the m- and p-isomeric chain units present in the PAA. The composition was found to be independent of the diamine present, but dependent on the dianhydride component. A correlation exists between the experimentally determined isomer proportions and the calculated quantum chemical reactivity indices.

Published
1979
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169. Quantum chemical study of cyclization mechanism in polyamic acids

Author

V. V. Kudryavtsev, Vladimir A. Zubkov, M.M. Koton, and A. V. Yakimanskii

Subjects
chemistry.chemical_compound, Deprotonation, Chemistry, Amide, Yield (chemistry), Polymer chemistry, General Engineering, Ionic bonding, Organic chemistry, Protonation, MINDO, Decomposition, Radical cyclization
Abstract

The mechanism of cyclization has been studied by the MINDO quantum-chemical method in neutral and ionic forms of model compounds: maleamic and phthalamic acids as well as para-substituted N-phenylmaleamic acids. The activation energy of cyclization is shown to be higher in the neutral than in the ionic forms of all amic acids investigated. Cyclization of amic acids deprotonated in the amide group leads primarily to imides, while those protonated in the carboxyl group yield mostly isoimides. Formation of a mixed anhydride, which precedes the cyclization in the case of amic acids in their ionic form, facilitates not only the cyclization itself, but also the decomposition of cyclic tetrahedral intermediates to the final cyclization product. The results show that thermal imidization involves the neutral while chemical imidization the ionic form of the amic acid.

Published
1986
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172. Investigation of the formation of polyamido-acids

Author

V. V. Kudryavtsev, K.K. Kalnin'sh, N.A. Adrova, A.M. Dubnova, M.M. Koton, and V.M. Svetlichnyi

Subjects
chemistry.chemical_compound, Reaction rate constant, Logarithm, chemistry, Diamine, Chemical structure, Polymer chemistry, Kinetics, General Engineering, Organic chemistry, Infrared spectroscopy
Abstract

The kinetics of the interaction of dianhydrides of tetracarboxylic acids with aromatic diamines were investigated by means of infrared spectroscopy. It is shown that the process is described by an equation for second order reactions, and that the logarithm of the rate constant is a linear function of the pKa value of the diamine. A relationship was found between the chemical structure of the dianhydrides and their acylating capacity.

Published
1974
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173. Subsonic flow of a compressible gas around a semiinfinite flat plate in a pipe

Author

V. V. Kudryavtsev and B. S. Kirnasov

Subjects
Fluid Flow and Transfer Processes, Physics, Ideal (set theory), Flow (mathematics), Generalization, Mechanical Engineering, Compressibility, General Physics and Astronomy, Mechanics, Flow pattern
Abstract

The subsonic flow of an ideal compressible gas around the rear end of a semiinfinite flat plate in a pipe is considered. The flow pattern is similar to that assumed by Efros [1, 2] with a return stream for the cavitational flows. Fal'kovich's method [3] is used to solve the problem and this makes it possible to obtain the solution to the problems of the gas streams at several typical velocities. The method is a generalization of that of Chaplygin [4] for flow problems at one typical velocity.

Published
1973
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174. Thermochemical Reactions of H Complexes.

Author

Yu. N. Sazanov, V. N. Artem'eva, G. N. Fedorova, N. V. Kukarkina, E. M. Kulikova, and V. V. Kudryavtsev

Abstract

Thermal reactions of H complexes formed by methyl and ethyl diesters of aromatic tetracarboxylic acids with diamines were studied by thermal analysis. Some kinetic parameters of formation and degradation of polyimides during thermolysis in the self-generated atmosphere were determined. [ABSTRACT FROM AUTHOR]

Published
2003

179. Synthesis of N-substituted succinamide and citraconamide

Author

V. A. Gusinskaya, V. V. Kudryavtsev, and T. V. Sheremeteva

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, Succinimide, Chemistry, Citraconimide, Aryl, Amide, Organic chemistry, General Chemistry, Ring (chemistry), Medicinal chemistry, Alkyl
Abstract

1. Succinimide and its alkyl and aryl derivatives, and also the alkyl and aryl derivatives of citraconimide, react with alkylamines in the cold with opening of the ring. 2. A method was developed for the synthesis of N,N'-dialkyl, N-alkyl-N-aryl, and N,N,N'-trialkyl dicarboxylic diamides (succinamides and citraconamides). It permits the preparation of diamides having different substituents in the amide groups. 3. Nine previously undescribed compounds were synthesized.

Published
1963
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180. Microgeometry of the surface of cold-rolled electrical sheet with a coating

Author

A. G. Petrenko, V. V. Kudryavtsev, V. L. Andreev, and V. G. Borisenko

Subjects
Heat resistant, Materials science, Magnesium, Annealing (metallurgy), Metallurgy, Metals and Alloys, chemistry.chemical_element, Surface finish, engineering.material, Condensed Matter Physics, chemistry, Coating, Mechanics of Materials, Metallic materials, engineering
Abstract

1. In manufacturing cold-rolled electrical sheet with heat resistant coatings it is advisable to improve the surface finish before application of the coating, since it has a considerable effect on the microrelief after high-temperature annealing. 2. With magnesia coatings applied before high-temperature annealing the microrelief depends on the original finish, although the grade of the finish remains unchanged. A phosphate coating has no substantial effect on the microrelief. 3. The unevenness of the microrelief on commercial cold-rolled electrical sheet with magnesia and phosphate coatings is somewhat higher than that for “Karlit” coatings.

Published
1972
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181. Action of methylamine on n,2-dimethylmaleimide

Author

V. V. Kudryavtsev and T. V. Sheremeteva

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, Double bond, chemistry, Succinimide, Methylamine, Stereochemistry, General Chemistry, Ring (chemistry), Imide, Medicinal chemistry
Abstract

1. The addition of methylamine to N,2-dimethylmaleimide can take two courses: a) with opening of the imide ring and preservation of the double bond, and b) with opening of the double bond with preservation of the imide ring. The course taken is determined by the moistness of the medium: for reaction to take the second course it is necessary for the reaction medium to be completely dry. 2. N,2-Dimethyl-2-(methylamino)succinimide and its hydrcchloride, and also N,N′,2-trimethyl-2-(methylamino)succinamide, were prepared and characterized.

Published
1966
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188. ChemInform Abstract: ABHAENGIGKEIT DER EIGENSCHAFTEN THERMISCH STABILER, ELEKTRISCH ISOLIERENDER UEBERZUEGE AUF TRANSFORMATORENSTAHL VON DEN TROCKNUNGSBEDINGUNGEN DER GRUNDSCHICHT UND DEM SCHWEFELGEHALT IM METALL

Author

I. M. Ivanova, A. G. Petrenko, V. L. Andreev, E. L. Korzina, D. K. Kuznetsov, V. P. Baryatinskii, I. I. Polyakov, V. G. Borisenko, Z. P. Ventskovich, V. V. Kudryavtsev, M. N. Sorokin, and V. M. Kakunin

Subjects
Chemistry, Polymer chemistry, General Medicine
Abstract

Dunne, elektrisch isolierende Mg-silicat/Mg-phosphatschichten werden aus wasrigen bzw. phosphorsauren MgO-Suspensionen auf Transformatorstahl erzeugt.

Published
1974
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190. Polyimide membranes formed on a metal grid matrix by the Langmuir–Blodgett method

Author

S. I. Goloudina, V. M. Pasyuta, V. V. Luchinin, M. F. Panov, V. P. Sklizkova, I. V. Gofman, and V. V. Kudryavtsev

Subjects
Matrix (mathematics), Membrane, Materials science, Physics and Astronomy (miscellaneous), Metal grid, Membrane thickness, Composite material, Grid, Langmuir–Blodgett film, Polyimide membrane, Polyimide
Abstract

An ultrathin polyimide membrane network has been formed for the first time on a metal grid matrix using the Langmuir-Blodgett method. The ratio of the membrane thickness to the grid mesh reaches 1: 1000.

191. Surface structure of semicrystalline polyimide films

Author

Alexander N. Ionov, V. V. Kudryavtsev, V. A. Zakrevskii, M. E. Vylegzhanina, D. V. Novikov, V. M. Svetlichnyi, A. A. Kutin, Tatiana Sukhanova, and A. L. Didenko

Subjects
Argon, Materials science, Polymers and Plastics, Scanning electron microscope, Annealing (metallurgy), chemistry.chemical_element, chemistry.chemical_compound, Crystallinity, chemistry, Chemical engineering, Polymer chemistry, Materials Chemistry, Cluster (physics), Thin film, Imide, Polyimide
Abstract

The surface structure of thin films based on poly[4,4′-bis(4″-N-phenoxy)diphenyl]amic acid of 1,3-bis(3′,4-dicarboxyphenoxy)benzene and the product of its thermal imidization—a semicrystalline polyimide—poly[4,4′-bis(4″-N-phenoxy)diphenyl]imide of 1,3-bis(3′,4-dicarboxyphenoxy)benzene—at various stges of thermal imidization and after melting and subsequent annealing has been studied by methods of transmission, scanning electron, and atomic force microscopies. The topological structure of the film surface has been described in terms of the discrete cluster model. Under heating to 200 and 280°C, a continuous network of the infinite cluster appears; subsequent annealing leads to disintegration of the network to discrete fragments that practically correspond to clusters in the starting poly(amic acid) film. The polyimide film heated to 280°C crystallizes in the form of needle crystals stable to the argon plasma. The surface morphology of polyimide films recrystallized from melt is of the spherulite character.

192. Structural investigation of four-centre photopolymerisation of bis-phthalamic bis-chalcone derivative in the crystalline state

Author

Galina Matveeva, V. V. Kudryavtsev, Alexander V. Yakimanski, Anatoli V. Dobrodumov, I. G. Voigt-Martin, and G. I. Nosova

Subjects
Diffraction, Molecular model, Chemistry, General Chemical Engineering, State (functional analysis), Electronic, Optical and Magnetic Materials, law.invention, Crystallography, Solid-state nuclear magnetic resonance, Electron diffraction, law, Irradiation, Electron microscope, Chalcone derivative
Abstract

By combining the results obtained from an electron diffraction tilting series with solid state NMR and powder X-ray diffraction, it was possible to determine the unit cell parameters and space group of BPABC crystals grown from DMAA solution both before and after irradiation. Subsequently semi-empirical quantum mechanical and packing energy calculations led to a model structure which agreed well with all the electron diffraction data and thus provided insight into the cross-linking mechanism. © 1997 John Wiley & Sons Ltd.

193. New photosensitive polyimide composites for optical technologies

Author

K. A. Romashkova, E. F. Galaktionova, T. A. Yurre, L. I. Rudaya, V. V. Kudryavtsev, N. V. Klimova, G. I. Nosova, and E. L. Aleksandrova

Subjects
chemistry.chemical_classification, Computational Mathematics, Materials science, Absorption spectroscopy, chemistry, Applied Mathematics, Photoconductivity, General Engineering, Polymer, Composite material, Atomic and Molecular Physics, and Optics, Polyimide

194. Relationship between acoustic emission and development of the damage zone in the interlaminar fracture of fiber composites

Author

A. M. Leksovskii, V. E. Yudin, V. V. Kudryavtsev, Boris Zaitsev, G. N. Gubanova, V. M. Svetlichnyi, and A. P. Tishkin

Subjects
chemistry.chemical_classification, Thermoplastic, Materials science, Polymers and Plastics, General Mathematics, Composite number, Thermosetting polymer, Condensed Matter Physics, Exponential function, Biomaterials, chemistry, Acoustic emission, Mechanics of Materials, Solid mechanics, Ceramics and Composites, Fracture (geology), Fiber, Composite material
Abstract

A study is made of unidirectional carbon-fiber-reinforced composites with both thermosetting and thermoplastic matrices. Experimental data on acoustic emission for unidirectional fiber composites with a crack is presented in the form of an exponential dependence of the number of AE signals on the stress-intensity factor. The increase in the size of the damage zone across the layers of the composite turns out to be linearly dependent on loading time (and, thus, on Klc), in contrast to the usual quadratic dependence along the layers.

195. Synthesis of 3-(dialkylphosphonium) amino-10-alkylphenothiazines

Author

V. V. Kudryavtsev and D. Kh. Yarmukhametova

Subjects
chemistry.chemical_compound, chemistry, Phosphorus, Phenothiazine, Side chain, chemistry.chemical_element, Organic chemistry, General Chemistry
Abstract

Twelve esters of a new class of phenothiazine, containing phosphorus in the side chain, have been synthesized.

Published
1968
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196. Synthesis of N-?- trifluoroethyl derivatives of maleic and citraconic acids

Author

V. V. Kudryavtsev, Z. V. Borisova, and T. V. Sheremeteva

Subjects
inorganic chemicals, chemistry.chemical_classification, chemistry.chemical_compound, chemistry, Group (periodic table), Halogen, Organic chemistry, General Chemistry, Citraconic acid, Alkyl
Abstract

Halogen derivatives of the N-alkylmonoamides and N-alkylimides of maleic and citraconic acid containing the strongly electronegative group CF3 in the alkyl radical, previously unreported in the literature, have been synthesized.

Published
1962
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198. Measurement of Λ_{b}^{0}, Λ_{c}^{+}, and Λ Decay Parameters Using Λ_{b}^{0}→Λ_{c}^{+}h^{-} Decays.

Author

Aaij R, Abdelmotteleb ASW, Abellan Beteta C, Abudinén F, Ackernley T, Adefisoye AA, Adeva B, Adinolfi M, Adlarson P, Agapopoulou C, Aidala CA, Ajaltouni Z, Akar S, Akiba K, Albicocco P, Albrecht J, Alessio F, Alexander M, Aliouche Z, Alvarez Cartelle P, Amalric R, Amato S, Amey JL, Amhis Y, An L, Anderlini L, Andersson M, Andreianov A, Andreola P, Andreotti M, Andreou D, Anelli A, Ao D, Archilli F, Argenton M, Arguedas Cuendis S, Artamonov A, Artuso M, Aslanides E, Ataíde Da Silva R, Atzeni M, Audurier B, Bacher D, Bachiller Perea I, Bachmann S, Bachmayer M, Back JJ, Baladron Rodriguez P, Balagura V, Baldini W, Balzani L, Bao H, Baptista de Souza Leite J, Barbero Pretel C, Barbetti M, Barbosa IR, Barlow RJ, Barnyakov M, Barsuk S, Barter W, Bartolini M, Bartz J, Basels JM, Bashir S, Bassi G, Batsukh B, Battista PB, Bay A, Beck A, Becker M, Bedeschi F, Bediaga IB, Behling NA, Belin S, Bellee V, Belous K, Belov I, Belyaev I, Benane G, Bencivenni G, Ben-Haim E, Berezhnoy A, Bernet R, Bernet Andres S, Bertolin A, Betancourt C, Betti F, Bex J, Bezshyiko I, Bhom J, Bieker MS, Biesuz NV, Billoir P, Biolchini A, Birch M, Bishop FCR, Bitadze A, Bizzeti A, Blake T, Blanc F, Blank JE, Blusk S, Bocharnikov V, Boelhauve JA, Boente Garcia O, Boettcher T, Bohare A, Boldyrev A, Bolognani CS, Bolzonella R, Bondar N, Bordelius A, Borgato F, Borghi S, Borsato M, Borsuk JT, Bouchiba SA, Bovill M, Bowcock TJV, Boyer A, Bozzi C, Brea Rodriguez A, Breer N, Brodzicka J, Brossa Gonzalo A, Brown J, Brundu D, Buchanan E, Buonaura A, Buonincontri L, Burke AT, Burr C, Butkevich A, Butter JS, Buytaert J, Byczynski W, Cadeddu S, Cai H, Caillet AC, Calabrese R, Calderon Ramirez S, Calefice L, Cali S, Calvi M, Calvo Gomez M, Camargo Magalhaes P, Cambon Bouzas JI, Campana P, Campora Perez DH, Campoverde Quezada AF, Capelli S, Capriotti L, Caravaca-Mora R, Carbone A, Carcedo Salgado L, Cardinale R, Cardini A, Carniti P, Carus L, Casais Vidal A, Caspary R, Casse G, Castro Godinez J, Cattaneo M, Cavallero G, Cavallini V, Celani S, Cervenkov D, Cesare S, Chadwick AJ, Chahrour I, Charles M, Charpentier P, Chatzianagnostou E, Chavez Barajas CA, Chefdeville M, Chen C, Chen S, Chen Z, Chernov A, Chernyshenko S, Chiotopoulos X, Chobanova V, Cholak S, Chrzaszcz M, Chubykin A, Chulikov V, Ciambrone P, Cid Vidal X, Ciezarek G, Cifra P, Clarke PEL, Clemencic M, Cliff HV, Closier J, Cocha Toapaxi C, Coco V, Cogan J, Cogneras E, Cojocariu L, Collins P, Colombo T, Colonna MC, Comerma-Montells A, Congedo L, Contu A, Cooke N, Corredoira I, Correia A, Corti G, Cottee Meldrum JJ, Couturier B, Craik DC, Cruz Torres M, Curras Rivera E, Currie R, Da Silva CL, Dadabaev S, Dai L, Dai X, Dall'Occo E, Dalseno J, D'Ambrosio C, Daniel J, Danilina A, d'Argent P, Davidson A, Davies JE, Davis A, De Aguiar Francisco O, De Angelis C, De Benedetti F, de Boer J, De Bruyn K, De Capua S, De Cian M, De Freitas Carneiro Da Graca U, De Lucia E, De Miranda JM, De Paula L, De Serio M, De Simone P, De Vellis F, de Vries JA, Debernardis F, Decamp D, Dedu V, Dekkers S, Del Buono L, Delaney B, Dembinski HP, Deng J, Denysenko V, Deschamps O, Dettori F, Dey B, Di Nezza P, Diachkov I, Didenko S, Ding S, Dittmann L, Dobishuk V, Docheva AD, Dong C, Donohoe AM, Dordei F, Dos Reis AC, Dowling AD, Duan W, Duda P, Dudek MW, Dufour L, Duk V, Durante P, Duras MM, Durham JM, Durmus OD, Dziurda A, Dzyuba A, Easo S, Eckstein E, Egede U, Egorychev A, Egorychev V, Eisenhardt S, Ejopu E, Eklund L, Elashri M, Ellbracht J, Ely S, Ene A, Epple E, Eschle J, Esen S, Evans T, Fabiano F, Falcao LN, Fan Y, Fang B, Fantini L, Faria M, Farmer K, Fazzini D, Felkowski L, Feng M, Feo M, Fernandez Casani A, Fernandez Gomez M, Fernez AD, Ferrari F, Ferreira Rodrigues F, Ferrillo M, Ferro-Luzzi M, Filippov S, Fini RA, Fiorini M, Fischer KL, Fitzgerald DS, Fitzpatrick C, Fleuret F, Fontana M, Foreman LF, Forty R, Foulds-Holt D, Franco Sevilla M, Frank M, Franzoso E, Frau G, Frei C, Friday DA, Fu J, Fuehring Q, Fujii Y, Fulghesu T, Gabriel E, Galati G, Galati MD, Gallas Torreira A, Galli D, Gambetta S, Gandelman M, Gandini P, Ganie B, Gao H, Gao R, Gao Y, Gao Y, Gao Y, Garau M, Garcia Martin LM, Garcia Moreno P, García Pardiñas J, Garg KG, Garrido L, Gaspar C, Geertsema RE, Gerken LL, Gersabeck E, Gersabeck M, Gershon T, Ghizzo SG, Ghorbanimoghaddam Z, Giambastiani L, Giasemis FI, Gibson V, Giemza HK, Gilman AL, Giovannetti M, Gioventù A, Girardey L, Gironella Gironell P, Giugliano C, Giza MA, Gkougkousis EL, Glaser FC, Gligorov VV, Göbel C, Golobardes E, Golubkov D, Golutvin A, Gomes A, Gomez Fernandez S, Goncalves Abrantes F, Goncerz M, Gong G, Gooding JA, Gorelov IV, Gotti C, Grabowski JP, Granado Cardoso LA, Graugés E, Graverini E, Grazette L, Graziani G, Grecu AT, Greeven LM, Grieser NA, Grillo L, Gromov S, Gu C, Guarise M, Guerry L, Guittiere M, Guliaeva V, Günther PA, Guseinov AK, Gushchin E, Guz Y, Gys T, Habermann K, Hadavizadeh T, Hadjivasiliou C, Haefeli G, Haen C, Haimberger J, Hajheidari M, Hallett G, Halvorsen MM, Hamilton PM, Hammerich J, Han Q, Han X, Hansmann-Menzemer S, Hao L, Harnew N, Hartmann M, Hashmi S, He J, Hemmer F, Henderson C, Henderson RDL, Hennequin AM, Hennessy K, Henry L, Herd J, Herrero Gascon P, Heuel J, Hicheur A, Hijano Mendizabal G, Hill D, Hollitt SE, Horswill J, Hou R, Hou Y, Howarth N, Hu J, Hu J, Hu W, Hu X, Huang W, Hulsbergen W, Hunter RJ, Hushchyn M, Hutchcroft D, Ilin D, Ilten P, Inglessi A, Iniukhin A, Ishteev A, Ivshin K, Jacobsson R, Jage H, Jaimes Elles SJ, Jakobsen S, Jans E, Jashal BK, Jawahery A, Jevtic V, Jiang E, Jiang X, Jiang Y, Jiang YJ, John M, John Rubesh Rajan A, Johnson D, Jones CR, Jones TP, Joshi S, Jost B, Juan Castella J, Jurik N, Juszczak I, Kaminaris D, Kandybei S, Kane M, Kang Y, Kar C, Karacson M, Karpenkov D, Kauniskangas A, Kautz JW, Keizer F, Kenzie M, Ketel T, Khanji B, Kharisova A, Kholodenko S, Khreich G, Kirn T, Kirsebom VS, Kitouni O, Klaver S, Kleijne N, Klimaszewski K, Kmiec MR, Koliiev S, Kolk L, Konoplyannikov A, Kopciewicz P, Koppenburg P, Korolev M, Kostiuk I, Kot O, Kotriakhova S, Kozachuk A, Kravchenko P, Kravchuk L, Kreps M, Krokovny P, Krupa W, Krzemien W, Kshyvanskyi OK, Kubat J, Kubis S, Kucharczyk M, Kudryavtsev V, Kulikova E, Kupsc A, Kutsenko BK, Lacarrere D, Laguarta Gonzalez P, Lai A, Lampis A, Lancierini D, Landesa Gomez C, Lane JJ, Lane R, Lanfranchi G, Langenbruch C, Langer J, Lantwin O, Latham T, Lazzari F, Lazzeroni C, Le Gac R, Lee H, Lefèvre R, Leflat A, Legotin S, Lehuraux M, Lemos Cid E, Leroy O, Lesiak T, Leverington B, Li A, Li C, Li H, Li K, Li L, Li P, Li PR, Li Q, Li S, Li T, Li T, Li Y, Li Y, Lian Z, Liang X, Libralon S, Lin C, Lin T, Lindner R, Lisovskyi V, Litvinov R, Liu FL, Liu G, Liu K, Liu S, Liu W, Liu Y, Liu Y, Liu YL, Lobo Salvia A, Loi A, Lomba Castro J, Long T, Lopes JH, Lopez Huertas A, López Soliño S, Lu Q, Lucarelli C, Lucchesi D, Lucio Martinez M, Lukashenko V, Luo Y, Lupato A, Luppi E, Lynch K, Lyu XR, Ma GM, Ma R, Maccolini S, Machefert F, Maciuc F, Mack B, Mackay I, Mackey LM, Madhan Mohan LR, Madurai MJ, Maevskiy A, Magdalinski D, Maisuzenko D, Majewski MW, Malczewski JJ, Malde S, Malentacca L, Malinin A, Maltsev T, Manca G, Mancinelli G, Mancuso C, Manera Escalero R, Manuzzi D, Marangotto D, Marchand JF, Marchevski R, Marconi U, Mariani E, Mariani S, Marin Benito C, Marks J, Marshall AM, Martel L, Martelli G, Martellotti G, Martinazzoli L, Martinelli M, Martinez Santos D, Martinez Vidal F, Massafferri A, Matev R, Mathad A, Matiunin V, Matteuzzi C, Mattioli KR, Mauri A, Maurice E, Mauricio J, Mayencourt P, Mazorra de Cos J, Mazurek M, McCann M, Mcconnell L, McGrath TH, McHugh NT, McNab A, McNulty R, Meadows B, Meier G, Melnychuk D, Meng FM, Merk M, Merli A, Meyer Garcia L, Miao D, Miao H, Mikhasenko M, Milanes DA, Minotti A, Minucci E, Miralles T, Mitreska B, Mitzel DS, Modak A, Mohammed RA, Moise RD, Mokhnenko S, Mombächer T, Monk M, Monteil S, Morcillo Gomez A, Morello G, Morello MJ, Morgenthaler MP, Morris AB, Morris AG, Mountain R, Mu H, Mu ZM, Muhammad E, Muheim F, Mulder M, Müller K, Muñoz-Rojas F, Murta R, Naik P, Nakada T, Nandakumar R, Nanut T, Nasteva I, Needham M, Neri N, Neubert S, Neufeld N, Neustroev P, Nicolini J, Nicotra D, Niel EM, Nikitin N, Nogarolli P, Nogga P, Nolte NS, Normand C, Novoa Fernandez J, Nowak G, Nunez C, Nur HN, Oblakowska-Mucha A, Obraztsov V, Oeser T, Okamura S, Okhotnikov A, Okhrimenko O, Oldeman R, Oliva F, Olocco M, Onderwater CJG, O'Neil RH, Osthues D, Otalora Goicochea JM, Owen P, Oyanguren A, Ozcelik O, Paciolla F, Padee A, Padeken KO, Pagare B, Pais PR, Pajero T, Palano A, Palutan M, Panshin G, Paolucci L, Papanestis A, Pappagallo M, Pappalardo LL, Pappenheimer C, Parkes C, Passalacqua B, Passaleva G, Passaro D, Pastore A, Patel M, Patoc J, Patrignani C, Paul A, Pawley CJ, Pellegrino A, Peng J, Pepe Altarelli M, Perazzini S, Pereima D, Pereira Da Costa H, Pereiro Castro A, Perret P, Perro A, Petridis K, Petrolini A, Pfaller JP, Pham H, Pica L, Piccini M, Pietrzyk B, Pietrzyk G, Pinci D, Pisani F, Pizzichemi M, Placinta V, Plo Casasus M, Poeschl T, Polci F, Poli Lener M, Poluektov A, Polukhina N, Polyakov I, Polycarpo E, Ponce S, Popov D, Poslavskii S, Prasanth K, Prouve C, Pugatch V, Punzi G, Qasim S, Qian QQ, Qian W, Qin N, Qu S, Quagliani R, Rabadan Trejo RI, Rademacker JH, Rama M, Ramírez García M, Ramos De Oliveira V, Ramos Pernas M, Rangel MS, Ratnikov F, Raven G, Rebollo De Miguel M, Redi F, Reich J, Reiss F, Ren Z, Resmi PK, Ribatti R, Ricart GR, Riccardi D, Ricciardi S, Richardson K, Richardson-Slipper M, Rinnert K, Robbe P, Robertson G, Rodrigues E, Rodriguez Fernandez E, Rodriguez Lopez JA, Rodriguez Rodriguez E, Roensch J, Rogachev A, Rogovskiy A, Rolf DL, Roloff P, Romanovskiy V, Romero Lamas M, Romero Vidal A, Romolini G, Ronchetti F, Rong T, Rotondo M, Roy SR, Rudolph MS, Ruiz Diaz M, Ruiz Fernandez RA, Ruiz Vidal J, Ryzhikov A, Ryzka J, Saavedra-Arias JJ, Saborido Silva JJ, Sadek R, Sagidova N, Sahoo D, Sahoo N, Saitta B, Salomoni M, Sanchez Gras C, Sanderswood I, Santacesaria R, Santamarina Rios C, Santimaria M, Santoro L, Santovetti E, Saputi A, Saranin D, Sarnatskiy A, Sarpis G, Sarpis M, Satriano C, Satta A, Saur M, Savrina D, Sazak H, Sborzacchi F, Scantlebury Smead LG, Scarabotto A, Schael S, Scherl S, Schiller M, Schindler H, Schmelling M, Schmidt B, Schmitt S, Schmitz H, Schneider O, Schopper A, Schulte N, Schulte S, Schune MH, Schwemmer R, Schwering G, Sciascia B, Sciuccati A, Sellam S, Semennikov A, Senger T, Senghi Soares M, Sergi A, Serra N, Sestini L, Seuthe A, Shang Y, Shangase DM, Shapkin M, Sharma RS, Shchemerov I, Shchutska L, Shears T, Shekhtman L, Shen Z, Sheng S, Shevchenko V, Shi B, Shi Q, Shimizu Y, Shmanin E, Shorkin R, Shupperd JD, Silva Coutinho R, Simi G, Simone S, Skidmore N, Skwarnicki T, Slater MW, Smallwood JC, Smith E, Smith K, Smith M, Snoch A, Soares Lavra L, Sokoloff MD, Soler FJP, Solomin A, Solovev A, Solovyev I, Song R, Song Y, Song Y, Song YS, Souza De Almeida FL, Souza De Paula B, Spadaro Norella E, Spedicato E, Speer JG, Spiridenkov E, Spradlin P, Sriskaran V, Stagni F, Stahl M, Stahl S, Stanislaus S, Stein EN, Steinkamp O, Stenyakin O, Stevens H, Strekalina D, Su Y, Suljik F, Sun J, Sun L, Sun Y, Sundfeld D, Sutcliffe W, Swallow PN, Swystun F, Szabelski A, Szumlak T, Tan Y, Tat MD, Terentev A, Terzuoli F, Teubert F, Thomas E, Thompson DJD, Tilquin H, Tisserand V, T'Jampens S, Tobin M, Tomassetti L, Tonani G, Tong X, Torres Machado D, Toscano L, Tou DY, Trippl C, Tuci G, Tuning N, Uecker LH, Ukleja A, Unverzagt DJ, Ursov E, Usachov A, Ustyuzhanin A, Uwer U, Vagnoni V, Valenti G, Valls Canudas N, Van Hecke H, van Herwijnen E, Van Hulse CB, Van Laak R, van Veghel M, Vasquez G, Vazquez Gomez R, Vazquez Regueiro P, Vázquez Sierra C, Vecchi S, Velthuis JJ, Veltri M, Venkateswaran A, Vesterinen M, Vico Benet D, Vieites Diaz M, Vilasis-Cardona X, Vilella Figueras E, Villa A, Vincent P, Volle FC, Vom Bruch D, Voropaev N, Vos K, Vouters G, Vrahas C, Wagner J, Walsh J, Walton EJ, Wan G, Wang C, Wang G, Wang J, Wang J, Wang J, Wang J, Wang M, Wang NW, Wang R, Wang X, Wang X, Wang XW, Wang Y, Wang Z, Wang Z, Wang Z, Ward JA, Waterlaat M, Watson NK, Websdale D, Wei Y, Wendel J, Westhenry BDC, White C, Whitehead M, Whiter E, Wiederhold AR, Wiedner D, Wilkinson G, Wilkinson MK, Williams M, Williams MRJ, Williams R, Williams Z, Wilson FF, Wislicki W, Witek M, Witola L, Wong CP, Wormser G, Wotton SA, Wu H, Wu J, Wu Y, Wu Z, Wyllie K, Xian S, Xiang Z, Xie Y, Xu A, Xu J, Xu L, Xu L, Xu M, Xu Z, Xu Z, Xu Z, Yang D, Yang K, Yang S, Yang X, Yang Y, Yang Z, Yang Z, Yeroshenko V, Yeung H, Yin H, Yu CY, Yu J, Yuan X, Yuan Y, Zaffaroni E, Zavertyaev M, Zdybal M, Zenesini F, Zeng C, Zeng M, Zhang C, Zhang D, Zhang J, Zhang L, Zhang S, Zhang S, Zhang Y, Zhang YZ, Zhao Y, Zharkova A, Zhelezov A, Zheng SZ, Zheng XZ, Zheng Y, Zhou T, Zhou X, Zhou Y, Zhovkovska V, Zhu LZ, Zhu X, Zhu X, Zhukov V, Zhuo J, Zou Q, Zuliani D, and Zunica G

Abstract

A comprehensive study of the angular distributions in the bottom-baryon decays Λ_{b}^{0}→Λ_{c}^{+}h^{-}(h=π,K), followed by Λ_{c}^{+}→Λh^{+} with Λ→pπ^{-} or Λ_{c}^{+}→pK_{S}^{0} decays, is performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 9  fb^{-1} collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The decay parameters and the associated charge-parity (CP) asymmetries are measured, with no significant CP violation observed. For the first time, the Λ_{b}^{0}→Λ_{c}^{+}h^{-} decay parameters are measured. The most precise measurements of the decay parameters α, β, and γ are obtained for Λ_{c}^{+} decays and an independent measurement of the decay parameters for the strange-baryon Λ decay is provided. The results deepen our understanding of weak decay dynamics in baryon decays.

Published
2024
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199. Measurement of CP Violation Observables in D^{+}→K^{-}K^{+}π^{+} Decays.

Author

Aaij R, Abdelmotteleb ASW, Abellan Beteta C, Abudinén F, Ackernley T, Adefisoye AA, Adeva B, Adinolfi M, Adlarson P, Agapopoulou C, Aidala CA, Ajaltouni Z, Akar S, Akiba K, Albicocco P, Albrecht J, Alessio F, Alexander M, Aliouche Z, Alvarez Cartelle P, Amalric R, Amato S, Amey JL, Amhis Y, An L, Anderlini L, Andersson M, Andreianov A, Andreola P, Andreotti M, Andreou D, Anelli A, Ao D, Archilli F, Argenton M, Arguedas Cuendis S, Artamonov A, Artuso M, Aslanides E, Ataíde Da Silva R, Atzeni M, Audurier B, Bacher D, Bachiller Perea I, Bachmann S, Bachmayer M, Back JJ, Baladron Rodriguez P, Balagura V, Baldini W, Balzani L, Bao H, Baptista de Souza Leite J, Barbero Pretel C, Barbetti M, Barbosa IR, Barlow RJ, Barnyakov M, Barsuk S, Barter W, Bartolini M, Bartz J, Basels JM, Bashir S, Bassi G, Batsukh B, Battista PB, Bay A, Beck A, Becker M, Bedeschi F, Bediaga IB, Behling NB, Belin S, Bellee V, Belous K, Belov I, Belyaev I, Benane G, Bencivenni G, Ben-Haim E, Berezhnoy A, Bernet R, Bernet Andres S, Bertolin A, Betancourt C, Betti F, Bex J, Bezshyiko I, Bhom J, Bieker MS, Biesuz NV, Billoir P, Biolchini A, Birch M, Bishop FCR, Bitadze A, Bizzeti A, Blake T, Blanc F, Blank JE, Blusk S, Bocharnikov V, Boelhauve JA, Boente Garcia O, Boettcher T, Bohare A, Boldyrev A, Bolognani CS, Bolzonella R, Bondar N, Bordelius A, Borgato F, Borghi S, Borsato M, Borsuk JT, Bouchiba SA, Bovill M, Bowcock TJV, Boyer A, Bozzi C, Brea Rodriguez A, Breer N, Brodzicka J, Brossa Gonzalo A, Brown J, Brundu D, Buchanan E, Buonaura A, Buonincontri L, Burke AT, Burr C, Butkevich A, Butter JS, Buytaert J, Byczynski W, Cadeddu S, Cai H, Caillet AC, Calabrese R, Calderon Ramirez S, Calefice L, Cali S, Calvi M, Calvo Gomez M, Camargo Magalhaes P, Cambon Bouzas JI, Campana P, Campora Perez DH, Campos AC, Campoverde Quezada AF, Capelli S, Capriotti L, Caravaca-Mora R, Carbone A, Carcedo Salgado L, Cardinale R, Cardini A, Carniti P, Carus L, Casais Vidal A, Caspary R, Casse G, Castro Godinez J, Cattaneo M, Cavallero G, Cavallini V, Celani S, Cervenkov D, Cesare S, Chadwick AJ, Chahrour I, Charles M, Charpentier P, Chatzianagnostou E, Chavez Barajas CA, Chefdeville M, Chen C, Chen S, Chen Z, Chernov A, Chernyshenko S, Chiotopoulos X, Chobanova V, Cholak S, Chrzaszcz M, Chubykin A, Chulikov V, Ciambrone P, Cid Vidal X, Ciezarek G, Cifra P, Clarke PEL, Clemencic M, Cliff HV, Closier J, Cocha Toapaxi C, Coco V, Cogan J, Cogneras E, Cojocariu L, Collins P, Colombo T, Colonna MC, Comerma-Montells A, Congedo L, Contu A, Cooke N, Corredoira I, Correia A, Corti G, Cottee Meldrum JJ, Couturier B, Craik DC, Cruz Torres M, Curras Rivera E, Currie R, Da Silva CL, Dadabaev S, Dai L, Dai X, Dall'Occo E, Dalseno J, D'Ambrosio C, Daniel J, Danilina A, d'Argent P, Davidson A, Davies JE, Davis A, De Aguiar Francisco O, De Angelis C, De Benedetti F, de Boer J, De Bruyn K, De Capua S, De Cian M, De Freitas Carneiro Da Graca U, De Lucia E, De Miranda JM, De Paula L, De Serio M, De Simone P, De Vellis F, de Vries JA, Debernardis F, Decamp D, Dedu V, Dekkers S, Del Buono L, Delaney B, Dembinski HP, Deng J, Denysenko V, Deschamps O, Dettori F, Dey B, Di Nezza P, Diachkov I, Didenko S, Ding S, Dittmann L, Dobishuk V, Docheva AD, Dong C, Donohoe AM, Dordei F, Dos Reis AC, Dowling AD, Duan W, Duda P, Dudek MW, Dufour L, Duk V, Durante P, Duras MM, Durham JM, Durmus OD, Dziurda A, Dzyuba A, Easo S, Eckstein E, Egede U, Egorychev A, Egorychev V, Eisenhardt S, Ejopu E, Eklund L, Elashri M, Ellbracht J, Ely S, Ene A, Epple E, Eschle J, Esen S, Evans T, Fabiano F, Falcao LN, Fan Y, Fang B, Fantini L, Faria M, Farmer K, Fazzini D, Felkowski L, Feng M, Feo M, Fernandez Casani A, Fernandez Gomez M, Fernez AD, Ferrari F, Ferreira Rodrigues F, Ferrillo M, Ferro-Luzzi M, Filippov S, Fini RA, Fiorini M, Fischer KL, Fitzgerald DS, Fitzpatrick C, Fleuret F, Fontana M, Foreman LF, Forty R, Foulds-Holt D, Franco Sevilla M, Frank M, Franzoso E, Frau G, Frei C, Friday DA, Fu J, Fuehring Q, Fujii Y, 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Zhukov V, Zhuo J, Zou Q, Zuliani D, and Zunica G

Abstract

A search for violation of the charge-parity (CP) symmetry in the D^{+}→K^{-}K^{+}π^{+} decay is presented, with proton-proton collision data corresponding to an integrated luminosity of 5.4  fb^{-1}, collected at a center-of-mass energy of 13 TeV with the LHCb detector. A novel model-independent technique is used to compare the D^{+} and D^{-} phase-space distributions, with instrumental asymmetries subtracted using the D_{s}^{+}→K^{-}K^{+}π^{+} decay as a control channel. The p value for the hypothesis of CP conservation is 8.1%. The CP asymmetry observables A_{CP|S}^{ϕπ^{+}}=(0.95±0.43_{stat}±0.26_{syst})×10^{-3} and A_{CP|S}^{K[over ¯]^{*0}K^{+}}=(-0.26±0.56_{stat}±0.18_{syst})×10^{-3} are also measured. These results show no evidence of CP violation and represent the most sensitive search performed through the phase space of a multibody decay.

Published
2024
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200. Observation of New Charmonium or Charmoniumlike States in B^{+}→D^{*±}D^{∓}K^{+} Decays.

Author

Aaij R, Abdelmotteleb ASW, Abellan Beteta C, Abudinén F, Ackernley T, Adefisoye AA, Adeva B, Adinolfi M, Adlarson P, Agapopoulou C, Aidala CA, Ajaltouni Z, Akar S, Akiba K, Albicocco P, Albrecht J, Alessio F, Alexander M, Aliouche Z, Alvarez Cartelle P, Amalric R, Amato S, Amey JL, Amhis Y, An L, Anderlini L, Andersson M, Andreianov A, Andreola P, Andreotti M, Andreou D, Anelli A, Ao D, Archilli F, Argenton M, Arguedas Cuendis S, Artamonov A, Artuso M, Aslanides E, Atzeni M, Audurier B, Bacher D, Bachiller Perea I, Bachmann S, Bachmayer M, Back JJ, Baladron Rodriguez P, Balagura V, Baldini W, Baptista de Souza Leite J, Barbetti M, Barbosa IR, Barlow RJ, Barsuk S, Barter W, Bartolini M, Bartz J, Baryshnikov F, Basels JM, Bassi G, Batsukh B, Battig A, Bay A, Beck A, Becker M, Bedeschi F, Bediaga IB, Beiter A, Belin S, Bellee V, Belous K, Belov I, Belyaev I, Benane G, Bencivenni G, Ben-Haim E, Berezhnoy A, Bernet R, Bernet Andres S, Bertella C, Bertolin A, Betancourt C, Betti F, Bex J, 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Abstract

A study of resonant structures in B^{+}→D^{*+}D^{-}K^{+} and B^{+}→D^{*-}D^{+}K^{+} decays is performed, using proton-proton collision data at center-of-mass energies of sqrt[s]=7, 8, and 13 TeV recorded by the LHCb experiment, corresponding to an integrated luminosity of 9  fb^{-1}. A simultaneous amplitude fit is performed to the two channels with contributions from resonances decaying to D^{*-}D^{+} and D^{*+}D^{-} states linked by C parity. This procedure allows the C parities of resonances in the D^{*±}D^{∓} mass spectra to be determined. Four charmonium or charmoniumlike states are observed decaying into D^{*±}D^{∓}: η_{c}(3945), h_{c}(4000), χ_{c1}(4010), and h_{c}(4300), with quantum numbers J^{PC} equal to 0^{-+}, 1^{+-}, 1^{++}, and 1^{+-}, respectively. At least three of these states have not been observed previously. In addition, the existence of the T_{c[over ¯]s[over ¯]0}^{*}(2870)^{0} and T_{c[over ¯]s[over ¯]1}^{*}(2900)^{0} resonances in the D^{-}K^{+} mass spectrum, already observed in the B^{+}→D^{+}D^{-}K^{+} decay, is confirmed in a different production channel.

Published
2024
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