Search

A polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) exhibiting a well-defined structure was prepared combining anionic polymerization and mercaptan/e-caprolactam living polymerization. To evaluate how this block copolymer affected the crystallization of polylactide (PLA), 0.5 wt % thiol-terminated PS homopolymer (PSSH), PMMA, and PS-b-PMMA was melt-blended with PLA. The calorimetric characterization of the nonisothermal and isothermal crystallization behavior was analyzed according to Avrami's theory, indicating that PS-b-PMMA more effectively increased the crystallization kinetics of the PLA matrix than did PSSH or PMMA. The results revealed that the synergistic effect of the PS and PMMA blocks appeared only when they were simultaneously presented in the PLA matrix. The PS block increased the number of nucleation sites and decreased the spherulite size, whereas the PMMA block facilitated the excellent dispersion of PS-b-PMMA in the PLA matrix as shown in polarizing optical microscope experiments. Incorporating PS-b-PMMA improved the PLA crystallization rate by promoting heterogeneous nucleation. In addition, incorporating 0.5 wt % PS-b-PMMA increased the relative crystallinity of PLA to 43.5%, and decreased the crystallization half-time to 2.4 min when the blend was isothermal at 105 °C. The PLA crystal structure was unchanged by the presence of PS-b-PMMA; however, the crystallization rate was enhanced as probed by SEM and X-ray diffraction. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014, 52, 823–832

Through using modified masterbatch method which comprised the wet kneading and intercalated modifiers process, the fully exfoliated nylon clay hybrids (NCHs) were achieved. In the wet kneading procedure, the organoclay plates were easily wetting by the intercalated modifiers. Then the shearing force could completely exfoliate the organoclay with nylon 6 matrix even which only had lower molecular weight during the extrusion process. NCEs and NCAs, two series of NCHs, were prepared from the intercalated modifiers, alkylamide and polyamide, respectively. The XRD and TEM examinations show that the fully exfoliated NCHs can easily be made. The NCEs show a faster crystallization rate because alkylamide with the lower molecular length and the melting temperature act as a soft segment to make crystallization more easily and more regularly. The tensile test shows that the NCEs have higher values of modulus and yield strength and the NCAs can keep better elongation properties. Furthermore, the tensile specimen shows a cone-like fracture, which is considered more perfectly exfoliated and arranged because of the good interaction between the silicate plates and nylon 6. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

A series of anatase TiO2-based nanocomposite incorporated with plasma-modified multi-walled carbon nanotubes (MWNTs) was prepared by physical blending and shows its capability for efficient electron transport when used as photoanode in dye-sensitized solar cells (DSSCs). These MWNTs characterized with good dispersal performance were obtained by functionalization technique via in situ plasma treatment and subsequent grafting with maleic anhydride (MA) onto the external walls reported previously. Compared with the conventional DSSCs, the TiO2 film with 1D carbon nanotubes possesses more outstanding ability to transport electrons injected from the excited dye within the device under illumination. As a result, at an optimum addition of 0.3 wt% MWNTs-MA in TiO2 matrix, the photocurrent–voltage (J–V) characteristics showed a significant increase in the short-circuit photocurrent (Jsc) of 50%, leading to an increase in overall solar conversion efficiency by a factor of 1.5. Electrochemical impedance spectroscopy analyses reveal that the MWNTs-MA/TiO2 incur smaller resistances at the photoanode in assembled DSSCs when compared with those in the anatase titania DSSCs. These features suggest that the conducting properties of the MWNTs-MA within the anodes are crucial for achieving a higher transport rate for photo-induced electrons in TiO2 layer by exhibiting lower resistance in the porous network and hence retard charge recombination that could result in poor conversion efficiency. Copyright © 2012 John Wiley & Sons, Ltd.

A series of poly(N-isopropylacrylamide)-co-poly(Ne-benzyloxycarbonyl-L-lysine) graft copolymers (PNIPAm-co-PZLLys) with different side chains (degree of polymerization, DP = 5∼40) and unit ratios (from 30 to 70 mol %) were prepared via free radical polymerization, followed by cleaving benzyloxycarbonyl groups (Z groups) to obtain the double hydrophilic graft copolymer, poly(N-isopropylacrylamide)-co-poly(L-lysine) (PNIPAm-co-PLLys). The pH- and temperature-response properties of the graft copolymers in aqueous solution were studied. The experimental results indicate L15-N30 and L15N-70, that is, the PNIPAm-co-PLLys having the poly(L-lysine) of DP = 15 as side chains as well as 30 and 70 mol %, respectively, of PNIPAm as backbone, have coil-to-helix transitions from pH 6 to pH 12 at room temperature and form uniform nanoscale micelle-like dispersions in aqueous solution at pH 12. The graft copolymers also could form uniform and nanoscale micelle-like structures at 50 °C in pH 6 buffer solution due to slightly polymer aggregation. With temperature and pH increased, both the deprotonated PLLys side chains and PNIPAm backbone become hydrophobic, leading to polymer precipitation. These results illustrate that a double tunable hydrophilic graft copolymer had been successfully synthesized via a simple radical polymerization, and could form micelles without serious polymer aggregation at a lower pH and a higher temperature. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011

This study applied the macromonomers and glycidyl methacrylate (GMA) to synthesize a series of the graft copolymers, poly(GMA)-graft-poly(Z-L-lysine), and investigated the conformation of the graft copolymer. The graft copolymers were synthesized with different GMA monomer ratios (28 to 89%) and different degrees of polymerization (DP) (8 to 15) of the poly(Z-L-lysine) side chain to analyze secondary structure relationships. Atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), and both wide angle and small angle X-ray scattering spectroscopy (WAXS, SAXS) were used to investigate the relationship between the microstructure and conformation of the graft copolymers and the different monomer ratios and side chain DP. In AFM images, n8-G89 (the graft copolymer containing 89% GMA units and the macromonomer DP is 8) showed tiny and uniform rod-like structures, and n14-G43 (the graft copolymer containing 43% GMA units and the macromonomer DP is 14) showed uniform rod-like structures. FTIR spectra of the graft copolymers showed that the variations of α-helix and β-sheet secondary structures in the graft copolymers relate to the monomer ratios of the graft copolymers. However, the X-ray scattering patterns indicated that the graft copolymer conformations were mainly dependent on the poly(Z-L-lysine) side chain length, and these results were completely in accordance with the AFM images.

A series of the acrylic chelating polymer, poly(butyl acrylates-co-glycidyl methacrylate-co-2-methylacrylic acid 3-(bis-carboxymethylamino)-2-hydroxy-propyl ester) was prepared to act as the additive in the preparation of yttrium iron garnet (YIG) nanoparticle precursor (ACP). The ACPs and YIG nanocrystal were identified by using Fourier transfer infrared spectrophotometry (FT-IR), inductively coupled plasma (ICP), X-ray diffraction (XRD) spectra, and transmission electron microscope (TEM) micrograph, respectively. Compared to the traditional YIG preparation, the well-formed YIG nanocrystal could be obtained by using this ACP precursor at a low calcination temperature of 600°C. In addition, the more amount of the chelating group was added, the higher purity of the YIG nanocrystal was obtained. Furthermore, the YIG nanocrystal obtained by using the ACP precursor had a nearly superparamagnetic behavior and their saturated magnetic property was around 5.7–41.9 emu/g after the vibrating sample magnetometer (VSM) examination. In summary, the chelating polymer additive improves not only the crystallinity of the YIG nanocrystal but also magnificently decreases the sintering temperature of the YIG nanocrystal. Copyright © 2009 John Wiley & Sons, Ltd.

Highly photoluminescent hybrid Zn(II)-doped CdS nanocluster/copolymer nanocomposites latex were prepared by using the chelating copolymer, poly(methyl methacrylate-co-methyl acrylate-co-2-methyl acrylic acid 3-(bis-carboxymethyl amino)-2-hydroxyl-propyl ester), with in-situ chemical precipitation method. The morphology and photoluminescence property of the hybrid Zn(II)-doped CdS nanocluster/copolymer nanocomposites latex was examined by TEM and photoluminescence analyzer (PL), respectively. The photoluminescent intensity of the hybrid CdS nanocluster/copolymer nanocomposites could be enhanced by Zn(II) doped treatment from the PL measurement. Furthermore, these hybrid nanocomposite latex could be easily manufactured into the transparent nanocomposite membrane without losing their photoluminescence property as they were cured at 60 °C. Interestingly, the photoluminescence property of the hybrid Zn(II)-doped CdS nanocluster/copolymer nanocomposite membranes would be influenced by amino compounds due to the surface passivation effect. When the secondary amine compounds were used as the surface passivation materials, the photoluminescent intensity of the hybrid nanocomposite membrane would be enhanced. On the contrary, the hybrid nanocomposite membranes would descend their photoluminescent intensity as the primary amine compounds were used as surface passivation materials.

Highly luminescent hybrid CdS (diameter = 3–6 nm)/copolymer nanocomposites are prepared by using the soap-free emulsion polymerization with chemical precipitation methods in this investigation. The core/shell type of ZnS/CdS nanoparticle on the shell layer of the copolymer microsphere can be obtained via the ion-exchange method. The luminescent intensity and energy of the hybrid CdS/copolymer nanocomposite not only can be improved by increasing the pH value due to the surface passivated by the iminodiacetic acid sodium salt of the polymer side chain, but also can be enhanced by the higher band gap inorganic materials ZnS shell layer. In addition, the CdS nanoparticle passivated by inorganic shell ZnS is more robust than when organically passivation. Furthermore, these hybrid nanoparticles are easily employed to manufacture the transparent copolymer membrane at the film formation temperature (60°C), and they still keep their high luminescent property. Copyright © 2006 John Wiley & Sons, Ltd.

Cumene peroxide is an important oxidant in the chemistry industry; however, the conversion and selectivity of cumene peroxide are still not desirable in the practical preparation process because there are some side reactions occurring in the high conversion. Hence, the reaction mechanism is investigated by many researchers. Fortunately, the high catalysis performance polymeric catalyst for cumene peroxidation was successfully synthesized in a previous study, thus, the reaction mechanism is to be investigated in this study. Except for cumene peroxide, three by-products, including acetophenone, 2-phenyl-2-propanol, 1-methylethenyl benzene of cumene peroxidation are identified from the results of high performance liquid chromatography (HPLC), gas chromatography mass spectroscopy (GC-MS), H1-NMR analysis. Furthermore, the mechanism of cumene peroxidation catalyzed by cobalt(II)-chelated copolymer is also proposed herein. The initiation rate equation represents ri = k[cumene]1.0[polymer-Co(II) complex]0.5 according to the kinetic study of cumene peroxidation catalyzed by metal-chelated copolymer. Meanwhile, the activation energy of cumene peroxidation by metal-chelated copolymer catalyst is 10.7 kcal/mol, which is located in the range of radical reactions. Copyright © 2006 John Wiley & Sons, Ltd.

Strong-field ligands (amino moieties) are introduced into a hydrogel resin to obtain a chelating resin via inversion suspension polymerization. The characteristics of chelating copolymers are measured by using Fourier transform IR spectroscopy (FTIR), elemental analysis (EA), and scanning electron microscopy (SEM). After chelating copolymers adsorb cupric ions, the absorption peak of stretch NH is shifted to higher frequency because of a coordination reaction from the FTIR spectra. Furthermore, the mechanism of metal complex adsorption on the chelating copolymer is that the strong-field chelating ligand decomposes the bonding of the metal complexes and recoordinates the cupric ion to a chelating polymer, which is examined via FTIR, SEM with EA, and ionic chromatography analysis. The maximum adsorption capacity of cupric ions is 1.08 mmol/g and the adsorption capacity increases with the increase of the pH of the solution. The stability constant of the Cu chelating copolymer is 1018.72, and it can have competition adsorption with EDTA in aqueous solution. These amino chelating copolymers can be used not only to recover metal ions but also to move anion pollution in wastewater. It is interesting that parts of the cupric ions adsorbed on the chelating copolymer are reduced into cupreous ions and/or copper atoms after electron spectroscopy for chemical analysis measurement. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 2457–2468, 2005

Polyurea, which was synthesized from 4,4'-diphenylmethane diisocyanate, Jeffamine-ED2001 (weight-average molecular weight: 2000), and 3,5-diaminobanzoic acid (DABA) were doped with lithium perchlorate (LiClO 4 ) as the polyelectrolyte. Differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, and 7 Li magic-angle spinning (MAS) solid-state NMR were used to monitor changes in the morphology of polyurea electrolytes corresponding to the concentration of LiClO 4 dopants. DSC showed the glass-transition temperature of the hard and soft segments increases with salt concentration. FTIR indicated the carboxylic group of DABA coordinates with the Li + ion, and the ordered hydrogen-bonded urea carbonyl groups are destroyed when the salt concentration exceeds 0.5 mmole of LiClO 4 (gPU-rea) -1 . The 7 Li MAS solid-state NMR investigation of the polyurea electrolytes revealed the presence of two Li + environments at lower temperature. Impedance spectroscopy measurements showed that the conductivity behavior followed the Arrhenius equation, and the maximum conductivity occurred when the crystalline structure of polyurea was disrupted.

Hydrolysis and condensation proceeded to generate 3-aminopropyl polysilsesquioxane-like (APPSSQ-like) particles from 3-aminopropyl triethoxysilane. An APPSSQ-like particle includes two domains: crosslinking SiOSi networks inside and 3-aminopropyl groups outside the particle. The APPSSQ-like/polyimide (APPSSQ-like/PI) hybrid composites were prepared from a solution of poly(amic acid) (PAA, polyimide precursor) and APPSSQ-like particles using N,N-dimethylacetamide as a solvent. Scanning electron microscopy (SEM) showed that the APPSSQ particle sizes were about 100 nm, and there was no obvious phase separation between the APPSSQ-like particles and the PI matrix in the fracture surfaces of the hybrid films. Owing to the highly crosslinked SiOSi networks inside the APPSSQ-like particles, the APPSSQ-like/PI hybrid composites possessed desired properties such as improved thermal resistance and reduced coefficients of thermal expansion (CTE). The presence of covalent bonds between the APPSSQ-like particles and the PI molecules improved the compatibility between these two components. Thus, the tensile strength increased with the APPSSQ-like content, and the elongation at break also slightly increased with the APPSSQ-like content. The initial tensile and storage moduli of the APPSSQ-like/PI hybrid composites increased with the APPSSQ-like content, which indicates that the mechanical properties of these hybrid composites were enhanced by the incorporation of the APPSSQ-like content in the PI matrix. Furthermore, the glass transition temperatures of these composites increased with the APPSSQ-like content because the adhesion between the APPSSQ-like particles and the PI molecules restricts the PI chains' mobility. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2865–2874, 2003

A triangular phase diagram of the polystyrene /styrene / ethylene-vinyl - acetate (PS/SM/EVA) system is established to account for the phase change during polymerization of SM. The phase behaviors for EVA and PS domains in the SM polymerization system are also studied by an optical microscope (OM) and a photometer. Both EVA and PS dissolve in SM quite easily, but PS and EVA are immiscible. Hence, the exclusion of PS from the EVA phase domain results during the polymerization. That is, the polymer solution will be phase-separated at the initial stage of polymerization. Additionally, EVA phase inversion occurs as the conversion of SM increases to 15%, at which the volume ratio of EVA/PS is approximately unity. Monitoring the light transmittance level of EVA/PS/SM solution during polymerization, the EVA phase proves to have been completely inverted to the dispersed phase when the SM conversion reaches 20%.

This study examined ethylene–vinyl acetate (EVA)-toughened polystyrene (PS). EVA is well-known to be incompatible with PS; thus, the PS graft to the EVA backbone (EVA-g-PS) was used as a compatibilizer and provided good adhesion at the interface of PS and EVA. In addition, the mechanical properties and impact resistance of the PS matrix were obviously improved by EVA-g-PS and by EVA itself. Meanwhile, differential scanning calorimetry results showed that the grafted PS chain influenced the crystallization of EVA; for example, the melting temperature, the crystallization temperature, and the percentage crystallinity related to EVA were reduced. Moreover, the addition of 10% EVA increased the impact strength by a factor of five but reduced the modulus by the same factor. Additionally, a lower number-average molecular weight EVA delayed phase inversion and resulted in poor mechanical properties. A fracture surface photograph revealed that the major mechanism of EVA-toughened PS was craze and local matrix deformation. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 699–705, 2003

A cobalt(II)-chelated copolymer was prepared through copolymerization of styrene, acrylonitrile (AN), and divinyl benzene with glycidyl methacrylate (GMA)-iminodiacetic acid (IDA) chelating monomers. Based on the experimental results of FTIR and EA, iminodiacetic acid was grafted on to the side chain of copolymer support. IDA contained in these copolymers was 22.67 wt%. BET was employed to measure the 0.7136 m2/g surface area, which provided the reaction sites for the reactants and active groups of the polymeric support. Additionally, the peroxidation of benzaldhyde with cobalt(II)-chelated copolymer was investigated. After 3 h, the perbenzoic acid yield increased to 82%. As well, the high yield and perbenzoic acid selectivity were 68.9% and 69%, respectively. More cobalt(II)-chelated copolymer used to catalyse peroxidation of benzaldehyde, the reaction rate was higher but the selectivity was decreased slightly in high conversion. Lower reaction temperature could moderate the characteristics of peroxidation for high conversion combined with low selectivity of perbenzoic acid. The perbenzoic acid content would decrease slightly owing to the presence of highly hydrophilic cobalt(II)-chelated copolymer, prepared when the oxidation reaction reached high conversion. Furthermore, the perbenzoic acid product was stable and not decomposed by this cobalt(II)-chelated copolymer. A moderate amount of water had a co-activing effect on the cobalt(II)-chelated copolymer. Copyright © 2003 John Wiley & Sons, Ltd.

Solid-state nuclear magnetic resonance (S-NMR) can reveal much useful information, including conformations, stereoregularity, defect structures, and comonomer sequence. S-NMR is especially useful for revealing microstructural differences that can alter local polymer chains. A series of bifunctional chelating/ion-exchange resins, containing differing ratios of iminodiacetic acid to acetic acid, were synthesized. Cross-polarization magic-angle spinning (CP/MAS) 13C-NMR was employed to measure conformation changes both before and after the bonding of ligands and lead ion adsorbed on bifunctional chelated/ion-exchange resins in this investigation. From the 13C-NMR spectra, as the lead ion was adsorbed by the iminodiacetic acid chelating group, the motion of molecular chain would be inhibited and the resonance peaks of the carboxylate anion at 170 ppm would shift downfield. Compared to the FTIR results, the downfield shift of the resonance peaks indicated that the bonding of carboxylate anion and lead ion adsorbed displayed an ionic trend. Furthermore, the bonding of the carboxylic group and lead ion adsorbed changed from ionic to covalent as the chelating group in bifunctional/ion-exchange resins decreased. The linear relationship between the areas of those resonance peaks and the amount of lead ion adsorbed was obtained from the spectra fitting. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 919–928, 2002

The chelating resins have high potential applications for the selective removal and recovery of metal ions from industrial waste solutions. The hydrophilic acrylate monomer with the iminodiacetic acid chelating group was prepared from glycidyl methacrylate and iminodiacetic acid at 60°C. The microbeads, prepared from acrylate monomer with the iminodiacetic acid chelating group, were employed by inversion suspension polymerization. In the pH range of 2–6, a reasonably good equilibrium sorption capacity is maintained for Cr3+ (ca. 2.7 mmol/g) and Cu2+ (ca. 1.8 mmol/g) in the chelating resins. The adsorption of Cd2+ and Pb2+ on microbeads is clearly affected by the pH of the solution, such that these ions' adsorption capacity increased with the pH of the aqueous solution. The adsorption of Cd2+ (ca. 1.25–1.87 mmol/g) and Pb2+ (ca. 0.99–1.89 mmol/g) showed a maximum at approximately pH = 5 and 6, respectively. The adsorption isotherms of Cr3+ and Cu2+ adsorbed on microbeads were following the Langmuir isotherm, but the adsorption behavior of Cd2+ and Pb2+ were not. The concentration of alkaline earth–metal cations on the range of 0–200 ppm had no influence on metal ions adsorbed capacity of chelating resins. Additionally, NTA (nitrilotriacetic acid) had no significant influence on metal ion adsorption by chelating resins. Furthermore, phenol pollutant can be adsorbed effectively by metal ions chelated microbeads; therefore, the microbeads were useful not only in recovering metal ions but also in the treating phenol pollutants in wastewater. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1353–1362, 2002; DOI 10.1002/app.10243

Ion-exchange resin has been considered as a suitable material for the recovery of heavy metals in water treatment. The chelating group, iminodiacetic acid (-R-N(CH 2 COOH) 2 ), was introduced into the weak-acid type (-R-(COOH) - ) -n ) ion-exchange resin to obtain bifunctional ion-exchange resins. Chromic, cupric, cadmium and lead ions were employed for adsorption experiments in this study. In isothermal experiments, the order of heavy metal ion adsorption decreased with increasing diameter of the heavy metal ion when the chelating group content was less than half. On the contrary, the adsorbed amount of lead ion would be higher than that of cadmic ion as the quantity of chelating group content was more than half owing to the stability constant difference (K s [ Pb2+ ] = 10 17.5 > K s[Cd2+] = 10 5.71 in iminodiacetic acid). The adsorption efficiency of bifunctional ion-exchange resins, especially for lead ions, would increase with rising chelating group content (from 0.08 mmol/mmol COOH to 0.31 mmol/mmol COOH). Meanwhile, the working pH range for metal ion adsorption in bifunctional ion-exchange resings was extended from 2.5 down to 0.5. Addition of chelating groups to weak acid ion-exchange resins could increase the adsorption efficiency for metal ions owing to the increased free volume of polymer structure.

Polymer-immobilized cobalt-EDTA complex was prepared by grafted copolymerization of methacrylic acid (MAA) and acrylonitrile (AN initiated by redox initiation of EDTA-2Na (Ethylenediamine tetraacetic acid disodium salt) with ceric ion (Ce2+)). High yield and selectivity for peroxidation of benzaldehyde were obtained when using the polymer-immobilized cobalt-EDTA complex as a catalyst. With the concentration of benzaldehyde increasing, the concentration of perbenzoic acid was increased from 0.38M to 0.98M, but yield of perbenzoic acid decreased from 0.76M to 0.65M. With the amount of the polymer support increased, the yield of perbenzoic acid increased from 70% to 82%. The selectivity remained about 82% in the various amounts of the polymer support. The activation energy of peroxidation of benzaldehyde was 43.4 KJ/mole. The expression of the reaction rate was: ri= k[RCHO][polymer support]0.5. A mechanism for peroxidation of benzaldhyde catalysed by polymer-immobilized cobalt-EDTA complex was proposed in this investigation. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 3248–3257, 2001

Miniemulsion polymerization is usually conducted by a two-stage process, miniemulsion and polymerization, where the reactants are first processed using a high shearing machine, then transferred to a reactor to polymerize with magnetic stirring. However, the particles size distributions obtained usually are broad and skewed to small sizes owing to micelle and homogeneous nucleation in the aqueous solution. In this study, a saw-toothed blade mixer was successfully used for miniemulsion polymerization with a rotating rate over 500 rpm. The addition sequence of the components also affected the miniemulsion process in this system. The best result was obtained when the surfactant and cetyl alcohol were first dissolved in water and then the styrene was mixed in. Furthermore, a fast dissociated redox initiator system (cumene hydroperoxide/Fe2+/ethylenediaminetetraacetic acid-disodium salt/sodium formaldehyde sulfoxylate) was used to prepare miniemulsion polymer and monodisperse polystyrene. © 1996 John Wiley & Sons, Inc.

Hydroxymethane sulfinate (sodium formaldehyde sulfoxylate, SFS) along with sodium lauryl sulfate (SLS) was used to induce the aqueous polymerization of n-butyl acrylate (n-BA). The reaction rate, molecular weights and latex stability with those two compounds were found to be promising. However, the polymerization involved a significantly limited conversion and broad dispersity in molecular weights and particle sizes. The polymerization behavior, depending on factors such as the concentrations of SFS, SLS and n-BA was different from that of traditional emulsion polymerizations. The rate dependence on the reaction temperature was described well by the Arrhenius equation, and the overall activation energy of polymerization thus obtained was 43 kJ/mol, which is close to that of redox-induced polymerizations. Hydroxymethansulfinat (SFS) wurde zusammen mit Laurylsulfat (SLS) zur Initiierung der Polymerisation von n-Butylacrylat (n-BA) in Wasser verwendet. Die Reaktionsgeschwindigkeiten, Molekulargewichte und Latexstabilitaten erwiesen sich als vielversprechend. Die Polymerisationen verliefen jedoch nur bis zu einem bestimmten Grenzumsatz mit breiten Molekulargewichts- und Teilchengrosenverteilungen. Das u. a. von den Konzentrationen an n-BA, SFS und SLS abhangende Polymerisationsverhalten unterscheidet sich von dem herkommlicher Emulsionpolymerisationen. Die Abhangigkeit der Polymerisationsgeschwindigkeit von der Temperatur last sich mit der Arrhenius-Gleichung beschreiben; die Gesamt-Aktivierungsenergie betragt 43 kJ/mol, was annahernd dem Wert von mit Redox-Initiatoren initiierten Polymerisationen entspricht.