Characterization of Syndiotactic Polystyrene Physical Gels Formed in Toluene/Chloroform Mixed Solvents

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  • WADA Risei
    Department of Applied Bioscience, Kanagawa Institute of Technology
  • YOSHIDA Ryoichi
    Department of Applied Chemistry and Bioscience, Graduate School of Engineering, Kanagawa Institute of Technology
  • SUZUKI Kazumasa
    Department of Applied Bioscience, Kanagawa Institute of Technology
  • SHIMIZU Hidenobu
    Department of Applied Bioscience, Kanagawa Institute of Technology Department of Applied Chemistry and Bioscience, Graduate School of Engineering, Kanagawa Institute of Technology
  • OKABE Masaru
    Department of Applied Bioscience, Kanagawa Institute of Technology Department of Applied Chemistry and Bioscience, Graduate School of Engineering, Kanagawa Institute of Technology

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Other Title
  • シンジオタクチックポリスチレンの混合溶媒中でのゲル化とゲルの性質
  • シンジオタクチックポリスチレン ノ コンゴウ ヨウバイ チュウ デ ノ ゲルカ ト ゲル ノ セイシツ

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Abstract

<p>A syndiotactic-rich polystyrene (sPS) in a mixed solvent of toluene and chloroform converted to a thermoreversible gel from its semi-dilute solution. According to measurements of gel-melting temperatures, toluene behaved as a relatively poor solvent for sPS, while chloroform was a relatively good solvent. The critical gelation concentration C*, i.e., the minimum concentration for gel formation became higher with increasing the volume fraction of chloroform Xchloro. In order to characterize the sPS physical gel formed in a mixed solvent, the junction length ζ and ρ sequence were estimated as a function of the volume fraction Xchloro using the thermodynamic theory derived by Tanaka and Stockmayer. The theory suggested that the junction size S (ζ × ρ) was ca. 320–450 for sPS/toluene gel, 150–200 for sPS/chloroform gel, and the junction size S decreased with increasing Xchloro. In other words, the junction size S became larger when a gel was formed in a poor solvent. FT-IR spectral data suggest that sPS chain adopted the T2G2 conformation in the mixed solvents of toluene and chloroform, and then gelation occurred. FE-SEM images show a fibrillar morphology of the sPS gel.</p>

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 76 (4), 267-275, 2019-07-25

    The Society of Polymer Science, Japan

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