The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform

Hiroshi Takiyama - One of the best experts on this subject based on the ideXlab platform.

  • solid liquid equilibrium data for the binary system Methacrylic Acid methanol in the high Methacrylic Acid concentration range
    Fluid Phase Equilibria, 2011
    Co-Authors: Tomomichi Hino, Shinpei Kato, Yugo Mizokoshi, Hiroshi Takiyama
    Abstract:

    Abstract Experimental solid–liquid equilibrium (SLE) data for the binary system Methacrylic Acid–methanol in the high concentration range of Methacrylic Acid were obtained and correlated using several methods. The heat of solution of Methacrylic Acid was obtained from the results. Several methods of determination of SLE categorized into two kinds of activity coefficient treatments were also studied. The former methods were the modified UNIFAC (Dortmund) model and the calculation from solubility parameters under regular solution assumption using predicted activity coefficients. The later were the NRTL equation and the λh equation estimating the heat of solution and activity coefficients directly by fitting the experimental SLE data. Based on the results, the recommended method of determination for this system was discussed.

  • Solid–liquid equilibrium data for the binary system Methacrylic Acid + methanol in the high Methacrylic Acid concentration range
    Fluid Phase Equilibria, 2011
    Co-Authors: Tomomichi Hino, Shinpei Kato, Yugo Mizokoshi, Hiroshi Takiyama
    Abstract:

    Abstract Experimental solid–liquid equilibrium (SLE) data for the binary system Methacrylic Acid–methanol in the high concentration range of Methacrylic Acid were obtained and correlated using several methods. The heat of solution of Methacrylic Acid was obtained from the results. Several methods of determination of SLE categorized into two kinds of activity coefficient treatments were also studied. The former methods were the modified UNIFAC (Dortmund) model and the calculation from solubility parameters under regular solution assumption using predicted activity coefficients. The later were the NRTL equation and the λh equation estimating the heat of solution and activity coefficients directly by fitting the experimental SLE data. Based on the results, the recommended method of determination for this system was discussed.

Reiko Saito - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis of syndiotactic poly(Methacrylic Acid) by free‐radical polymerization of the pseudo‐divinyl monomer formed with Methacrylic Acid and catechol
    Journal of Applied Polymer Science, 2012
    Co-Authors: Yoichi Saito, Reiko Saito
    Abstract:

    Syndiotactic poly(Methacrylic Acid) (Syn-PMAA, r diad = 91 mol %) was synthesized by free radical polymerization of Methacrylic Acid (MAA) with catechol. The pseudo-divinyl monomer was formed with one catechol and two MAA molecules by the hydrogen bonding between OH groups of catechol and COOH group of MAA. When the free radical polymerization of the pseudo-divinyl monomer was carried out, intra- and intermolecular addition proceeded with racemic addition. The hydrogen bonding was the driving force to control tacticity. We discussed the effects of solvent, temperature, and the concentrations of MAA and catechol on the pseudo-divinyl monomer formation. The highly syndiotactic PMAA was successfully obtained. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

  • Interaction between Methylene Blue and Cyclic Methacrylic Acid Oligomer
    Macromolecules, 2007
    Co-Authors: Reiko Saito, Kazutaka Yamaguchi, Tomoko Hara, Chihiro Saegusa
    Abstract:

    pKa values of linear and cyclic Methacrylic Acid oligomers with 14 of degree of polymerization were measured in aqueous solution by pH titration and compared with that of poly(Methacrylic Acid), PMAA, prepared by radical polymerization. pKa of cyclic Methacrylic Acid oligomer, 4.83, was between those of linear Methacrylic Acid oligomer and PMAA, 4.69 and 5.05, respectively, suggesting that the hydrophobic field was formed with methyl groups in cyclic Methacrylic Acid oligomer in aqueous solution. In order to investigate the inclusion ability of cyclic Methacrylic Acid oligomer in aqueous solution, methylene blue was added to the solution of cyclic Methacrylic Acid oligomer. Interaction between methylene blue and cyclic Methacrylic Acid oligomer was investigated by UV−vis spectrometry at pH = 7.2 and 2D-NMR with nuclear Overhauser enhancement spectroscopy. Cyclic Methacrylic Acid oligomer enhanced the dimer formation of methylene blue. The size of hydrophobic field in cyclic Methacrylic Acid oligomer was e...

  • Synthesis of poly(Methacrylic Acid) core/polystyrene shell type polymer microspheres
    Polymer, 1997
    Co-Authors: Reiko Saito, Shoutaro Tanaka, Koji Ishizu
    Abstract:

    Abstract Poly(styrene-b-Methacrylic Acid) block copolymers were synthesized by hydrolysis of poly(stryene-b-tert-butyl methacrylate) block copolymers. The microphase separated structures of these block copolymers were poly(Methacrylic Acid) spheres in polystyrene matrices. Upon crosslinking the poly(Methacrylic Acid) spheres with hexanediisocyanate in the solid film, the poly(Methacrylic Acid) core/polystyrene shell type polymer microspheres were obtained. The packing structures of the microspheres were hexagonal and face centred cubic in two and three dimensions, respectively.

Tomomichi Hino - One of the best experts on this subject based on the ideXlab platform.

  • solid liquid equilibrium data for the binary system Methacrylic Acid methanol in the high Methacrylic Acid concentration range
    Fluid Phase Equilibria, 2011
    Co-Authors: Tomomichi Hino, Shinpei Kato, Yugo Mizokoshi, Hiroshi Takiyama
    Abstract:

    Abstract Experimental solid–liquid equilibrium (SLE) data for the binary system Methacrylic Acid–methanol in the high concentration range of Methacrylic Acid were obtained and correlated using several methods. The heat of solution of Methacrylic Acid was obtained from the results. Several methods of determination of SLE categorized into two kinds of activity coefficient treatments were also studied. The former methods were the modified UNIFAC (Dortmund) model and the calculation from solubility parameters under regular solution assumption using predicted activity coefficients. The later were the NRTL equation and the λh equation estimating the heat of solution and activity coefficients directly by fitting the experimental SLE data. Based on the results, the recommended method of determination for this system was discussed.

  • Solid–liquid equilibrium data for the binary system Methacrylic Acid + methanol in the high Methacrylic Acid concentration range
    Fluid Phase Equilibria, 2011
    Co-Authors: Tomomichi Hino, Shinpei Kato, Yugo Mizokoshi, Hiroshi Takiyama
    Abstract:

    Abstract Experimental solid–liquid equilibrium (SLE) data for the binary system Methacrylic Acid–methanol in the high concentration range of Methacrylic Acid were obtained and correlated using several methods. The heat of solution of Methacrylic Acid was obtained from the results. Several methods of determination of SLE categorized into two kinds of activity coefficient treatments were also studied. The former methods were the modified UNIFAC (Dortmund) model and the calculation from solubility parameters under regular solution assumption using predicted activity coefficients. The later were the NRTL equation and the λh equation estimating the heat of solution and activity coefficients directly by fitting the experimental SLE data. Based on the results, the recommended method of determination for this system was discussed.

John J. Liggat - One of the best experts on this subject based on the ideXlab platform.

  • Thermal degradation of styrene-Methacrylic Acid copolymers
    Polymer Degradation and Stability, 1992
    Co-Authors: Ian C. Mcneill, John J. Liggat
    Abstract:

    Abstract Copolymers of styrene and Methacrylic Acid (MAA) with widely differing compositions have been studied by thermal volatilisation analysis (TVA) and thermogravimetry. The condensable volatile degradation products have been identified after separation by subambient TVA. The cold ring fraction (tar/wax products) and the structural changes in the residue in the course of degradation have also been examined. The copolymers are intermediate in stability between polystyrene (PS) and poly(Methacrylic Acid) (PMAA). The degradation products are mainly those expected by comparison with those obtained from the homopolymers, but Methacrylic Acid is formed in greater amount in the copolymer degradation and the distribution of MAA units leads to less intramolecular dehydration. Anhydride rings formed, however, reduce the zip length of depolymerisation to monomers, and both rings and isolated MAA units reduce the possibilities for transfer by polystyryl radicals.

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