The Experts below are selected from a list of 225 Experts worldwide ranked by ideXlab platform

Helmut Ritter - One of the best experts on this subject based on the ideXlab platform.

  • microwave assisted synthesis of thiol modified Polymethacrylic Acid and its cross linking with allyl modified Polymethacrylic Acid via thiol ene click reaction
    Macromolecular Chemistry and Physics, 2010
    Co-Authors: Mareike Bardts, Helmut Ritter
    Abstract:

    In this paper, we describe the thiol-ene "click" reaction with modified poly methacrylic Acid in water. The thiol group was implemented by a polymer analogous condensation reaction of Polymethacrylic Acid (1) and cysteamine (2), which was carried out in bulk by use of microwave. The allyl modified Polymethacrylic Acid (5) was obtained by DCC-coupling of the allyl amine onto the Polymethacrylic Acid backbone. By combination of cysteamine (3) and allyl modified Polymethacrylic Acid (5) the thiol-ene click reaction could be started with a redox initiator in aqueous solution at room temperature. The kinetics of this reaction were determined by 1 H NMR spectroscopy and the resulting hydrogels were analyzed by rheological measurements and differential scanning calorimetry (DSC).

  • Microwave Assisted Synthesis of Thiol Modified Polymethacrylic Acid and Its Cross‐Linking with Allyl Modified Polymethacrylic Acid via Thiol‐ene “Click” Reaction
    Macromolecular Chemistry and Physics, 2010
    Co-Authors: Mareike Bardts, Helmut Ritter
    Abstract:

    In this paper, we describe the thiol-ene "click" reaction with modified poly methacrylic Acid in water. The thiol group was implemented by a polymer analogous condensation reaction of Polymethacrylic Acid (1) and cysteamine (2), which was carried out in bulk by use of microwave. The allyl modified Polymethacrylic Acid (5) was obtained by DCC-coupling of the allyl amine onto the Polymethacrylic Acid backbone. By combination of cysteamine (3) and allyl modified Polymethacrylic Acid (5) the thiol-ene click reaction could be started with a redox initiator in aqueous solution at room temperature. The kinetics of this reaction were determined by 1 H NMR spectroscopy and the resulting hydrogels were analyzed by rheological measurements and differential scanning calorimetry (DSC).

Mareike Bardts - One of the best experts on this subject based on the ideXlab platform.

  • microwave assisted synthesis of thiol modified Polymethacrylic Acid and its cross linking with allyl modified Polymethacrylic Acid via thiol ene click reaction
    Macromolecular Chemistry and Physics, 2010
    Co-Authors: Mareike Bardts, Helmut Ritter
    Abstract:

    In this paper, we describe the thiol-ene "click" reaction with modified poly methacrylic Acid in water. The thiol group was implemented by a polymer analogous condensation reaction of Polymethacrylic Acid (1) and cysteamine (2), which was carried out in bulk by use of microwave. The allyl modified Polymethacrylic Acid (5) was obtained by DCC-coupling of the allyl amine onto the Polymethacrylic Acid backbone. By combination of cysteamine (3) and allyl modified Polymethacrylic Acid (5) the thiol-ene click reaction could be started with a redox initiator in aqueous solution at room temperature. The kinetics of this reaction were determined by 1 H NMR spectroscopy and the resulting hydrogels were analyzed by rheological measurements and differential scanning calorimetry (DSC).

  • Microwave Assisted Synthesis of Thiol Modified Polymethacrylic Acid and Its Cross‐Linking with Allyl Modified Polymethacrylic Acid via Thiol‐ene “Click” Reaction
    Macromolecular Chemistry and Physics, 2010
    Co-Authors: Mareike Bardts, Helmut Ritter
    Abstract:

    In this paper, we describe the thiol-ene "click" reaction with modified poly methacrylic Acid in water. The thiol group was implemented by a polymer analogous condensation reaction of Polymethacrylic Acid (1) and cysteamine (2), which was carried out in bulk by use of microwave. The allyl modified Polymethacrylic Acid (5) was obtained by DCC-coupling of the allyl amine onto the Polymethacrylic Acid backbone. By combination of cysteamine (3) and allyl modified Polymethacrylic Acid (5) the thiol-ene click reaction could be started with a redox initiator in aqueous solution at room temperature. The kinetics of this reaction were determined by 1 H NMR spectroscopy and the resulting hydrogels were analyzed by rheological measurements and differential scanning calorimetry (DSC).

Wei-kuo Chin - One of the best experts on this subject based on the ideXlab platform.

  • Thermal degradation of Polymethacrylic Acid
    Journal of Polymer Science Part A: Polymer Chemistry, 1992
    Co-Authors: Yu-der Lee, Wei-kuo Chin
    Abstract:

    The thermal degradation of Polymethacrylic Acid was found to have two separate decomposition regions. The first decomposition region, due to anhydride formation primarily, was caused by the conversion of Polymethacrylic Acid to Polymethacrylic anhydride. This reaction followed first-order kinetics and had an activation energy of 40.5 kcal/mol. The second decomposition region was the thermal degradation for the corresponding Polymethacrylic anhydride. In this region, the fragmentation of anhydride rings structure in Polymethacrylic anhydride constitutes the major decomposition reaction with an activation energy of 37.4 kcal/mol

Yu-der Lee - One of the best experts on this subject based on the ideXlab platform.

  • Thermal degradation of Polymethacrylic Acid
    Journal of Polymer Science Part A: Polymer Chemistry, 1992
    Co-Authors: Yu-der Lee, Wei-kuo Chin
    Abstract:

    The thermal degradation of Polymethacrylic Acid was found to have two separate decomposition regions. The first decomposition region, due to anhydride formation primarily, was caused by the conversion of Polymethacrylic Acid to Polymethacrylic anhydride. This reaction followed first-order kinetics and had an activation energy of 40.5 kcal/mol. The second decomposition region was the thermal degradation for the corresponding Polymethacrylic anhydride. In this region, the fragmentation of anhydride rings structure in Polymethacrylic anhydride constitutes the major decomposition reaction with an activation energy of 37.4 kcal/mol

S. Candau - One of the best experts on this subject based on the ideXlab platform.

  • Structure of polyacrylic Acid and Polymethacrylic Acid solutions : a small angle neutron scattering study
    Journal de Physique II, 1993
    Co-Authors: A. Moussaid, F. Schosseler, J. Munch, S. Candau
    Abstract:

    The intensity scattered from polyacrylic Acid and Polymethacrylic Acid solutions has been measured by small angle neutron scattering experiemnts. The influence of polymer concentration, ionization degree, temperature and salt content has been investigated. Results are in qualitative agreement with a model which predicts the existence of microphases in the unstable region of the phase diagram. Quantitative comparison with the theory is performed by fitting the theoretical structure factor to the experimental data. For a narrow range of ionizaiton degrees nearly quantitative agreement with the theory is found for the polyacrylic Acide system.

  • Structure of polyacrylic Acid and Polymethacrylic Acid solutions : a small angle neutron scattering study
    Journal de Physique II, 1993
    Co-Authors: A. Moussaid, F. Schosseler, J. P. Munch, S. Candau
    Abstract:

    The intensity scattered from polyacrylic Acid and Polymethacrylic Acid solutions has been measured by small angle neutron scattering experiments. The influence of polymer concentration, ionization degree, temperature and salt content has been investigated. Results are in qualitative agreement with a model which predicts the existence of microphases in the unstable region of the phase diagram. Quantitative comparison with the theory is performed by fitting the theoretical structure factor to the experimental data. For a narrow range of ionization degrees nearly quantitative agreement with the theory is found for the polyacrylic Acid system