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8 results on '"Miguel Rosales-Guzmán"'

4. Kinetic investigations on homo- and co-polymerizations of pentafluorophenyl (meth)acrylates

Author

Christine Weber, Carlos Guerrero-Sanchez, Julien Alex, Jens Ulbrich, Ulrich S. Schubert, and Miguel Rosales-Guzmán

Subjects
Molar mass, Polymers and Plastics, Organic Chemistry, Dispersity, General Physics and Astronomy, Chain transfer, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Methacrylate, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, Monomer, chemistry, Polymerization, Polymer chemistry, Materials Chemistry, Copolymer, Methyl methacrylate, 0210 nano-technology
Abstract

Pentafluorophenyl methacrylate (PFPMA) and pentafluorophenyl acrylate (PFPA) are frequently used monomers to produce advanced materials for biomedical applications via (co)polymerization reactions. This contribution reports kinetic investigations of the reversible addition fragmentation chain transfer (RAFT) copolymerization of PFPMA and methyl methacrylate (MMA) mediated by a dithiobenzoate chain transfer agent (CTA) at 70 °C in dimethyl formamide (DMF). Control with respect to the molar mass of the copolymers was observed for initial PFPMA monomer feeds ≤40 mol%. The rate of PFPMA incorporation decreased with increasing initial PFPMA feed ratios. Reactivity ratios were estimated with a nonlinear regression that utilizes a visualization of the sum of squares space method (rPFPMA = 1.06 and rMMA = 0.44). The slight preference for MMA-type radicals to add PFPMA monomers increased the rate of consumption of PFPMA especially in low initial PFPMA monomer feeds. In addition, kinetic investigations of the RAFT homopolymerization of PFPA revealed an induction period and poor control on the polymer molar mass in the polar solvents acetonitrile and DMF using a dithiobenzoate CTA. A better control using the same CTA was observed in 1,4-dioxane. Polymerizations carried out in the presence of a trithiocarbonate CTA were less affected by the solvent polarity and a good control on the polymer molar mass was achieved in acetonitrile and 1,4-dioxane even at high monomer conversion (>95%, dispersity value (Ð) ≤ 1.19).

Published
2021

5. Quasi-block copolymer design of quaternized derivatives of poly(2-(dimethylamino)ethyl methacrylate): Investigations on thermo-induced self-assembly

Author

Oscar E. Vega-Becerra, Victor D. Lechuga-Islas, Miguel Rosales-Guzmán, Carlos Guerrero-Sanchez, Grit Festag, Ulrich S. Schubert, and Ramiro Guerrero-Santos

Subjects
Molar mass, Materials science, Polymers and Plastics, Organic Chemistry, Cationic polymerization, General Physics and Astronomy, Chemical modification, Chain transfer, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Methacrylate, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, Monomer, chemistry, Dynamic light scattering, Polymer chemistry, Materials Chemistry, Copolymer, 0210 nano-technology
Abstract

We describe the sequential incorporation of the quaternized monomer N-(2-(Methacryloyloxy)ethyl)-N,N-dimethylheptan-1-ammonium (QDM) (from 1 up to 5 mol %) into 2-((dimethylamino)ethyl methacrylate) polymer chains (PDMAEMA), via reversible addition-fragmentation chain transfer (RAFT) technique, to yield quasi-block copolymers (PDMAEMA-qb-P(DMAEMA-co-QDM)) with modified hydrophilic nature and thermo-induced self-assembly properties in aqueous solutions. This chemical modification promotes the formation of metastable nanostructures in aqueous medium. The morphological transitions were investigated by means of atomic force microscopy (AFM), dynamic light scattering (DLS), rheology and turbidimetry. The results indicated that the obtained nanostructures were stabilized by associative and cationic interactions conveyed by the quaternized moieties within the polymer chains. The size of these nanostructures could be modified as a function of molar mass, copolymer composition and temperature. The method described denotes an interesting alternative to modify the thermo-induced self-assembly behavior of PDMAEMA based copolymers employing low amounts of quaternized moieties.

Published
2020

6. Strain state of poly(N -isopropylacrylamide) in polystyrene-b -poly(N -isopropylacrylamide) block copolymers and binary blends with polystyrene

Author

Miguel Rosales-Guzmán, Roberto Alexander-Katz, Patricia Castillo-Ocampo, Alejandro Vega-Rios, and Angel Licea-Claverie

Subjects
Materials science, Morphology (linguistics), Polymers and Plastics, Chain transfer, Raft, Condensed Matter Physics, chemistry.chemical_compound, Chemical engineering, chemistry, Polymer chemistry, Materials Chemistry, Copolymer, Poly(N-isopropylacrylamide), Lamellar structure, Polystyrene, Self-assembly, Physical and Theoretical Chemistry
Abstract

Three diblock copolymers of polystyrene-b-poly(N-isopropylacrylamide) (PS-b-PNIPAM) were prepared by reversible addition-fragmentation chain transfer technique (RAFT) with compositions fPS = 0.84, fPS = 0.29, and fPS = 0.33. Block copolymers rich in PNIPAM were blended with polystyrene and its morphological effects were studied. The morphology of thin films was induced by acetone vapor and determined in the dried state by means of TEM. Copolymers with fPS = 0.84 and fPS = 0.29 form hexagonally packed cylinder (HPC) morphologies while that with fPS = 0.33 corresponds to a lamellar structure. In almost all cases where PNIPAM constitutes the continuous phase, a contraction of the PNIPAM blocks with respect to their average unperturbed dimension was observed, contrary to what one expects from the physics of self-assembly of block copolymers. In contrast, for HPC morphology where PNIPAM is confined in a PS matrix, both blocks are highly extended. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2013, 51, 1368–1376

Published
2013

7. Macromol. Chem. Phys. 14/2018

Author

Román Torres-Lubián, Carlos Guerrero-Sanchez, Odilia Pérez-Camacho, Simon Harrisson, Enrique Saldívar-Guerra, Ulrich S. Schubert, and Miguel Rosales-Guzmán

Subjects
chemistry.chemical_compound, Glycidyl methacrylate, Olefin fiber, Materials science, Polymers and Plastics, chemistry, Organic Chemistry, Polymer chemistry, Materials Chemistry, Physical and Theoretical Chemistry, Condensed Matter Physics, 1-Octene
Published
2018

8. Kinetic and Copolymer Composition Investigations of the Free Radical Copolymerization of 1-Octene with Glycidyl Methacrylate

Author

Miguel Rosales-Guzmán, Simon Harrisson, Odilia Pérez-Camacho, Román Torres-Lubián, Carlos Guerrero-Sanchez, Ulrich S. Schubert, Enrique Saldívar-Guerra, Interactions moléculaires et réactivité chimique et photochimique (IMRCP), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Department of Chemical Engineering and Chemistry [Eindhoven], Eindhoven University of Technology [Eindhoven] (TU/e), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), P3R - Polymères de Précision par Procédés Radicalaires (P3R), and Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT)

Subjects
Olefin fiber, Glycidyl methacrylate, Copolymer composition, Materials science, Polymers and Plastics, Organic Chemistry, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Kinetic energy, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, chemistry, Polymer chemistry, Materials Chemistry, Copolymer, [CHIM]Chemical Sciences, Physical and Theoretical Chemistry, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, 1-Octene
Abstract

International audience

Published
2018

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