Sol-Gel Transition Curve of Poly(vinylidene fluoride) in Organic Solvents

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  • WADA Risei
    Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology; Shimo-ogino, Atsugi-shi 243-0292 Japan
  • AIHARA Kiyotaka
    Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology; Shimo-ogino, Atsugi-shi 243-0292 Japan
  • NOMOTO Hiroshi
    Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology; Shimo-ogino, Atsugi-shi 243-0292 Japan
  • TAZAKI Michiko
    Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology; Shimo-ogino, Atsugi-shi 243-0292 Japan
  • OKABE Masaru
    Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology; Shimo-ogino, Atsugi-shi 243-0292 Japan

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Other Title
  • ポリ(フッ化ビニリデン)の有機溶媒中でのゾル-ゲル転移曲線
  • ポリ フッカ ビニリデン ノ ユウキ ヨウバイ チュウ デ ノ ゾル ゲル テンイ キョクセン

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Description

It is well known that poly(1, 1-difluoroethylene)(hereafter named poly(vinylidene fluoride)(PVdF)) dissolved in some ketones or lactones at high temperature forms a thermoreversible gel in the vicinity of room temperature. In this study, the interaction parameter(x12) between PVdF and solvent was estimated as a function of temperature by an inverse gas chromatography(IGC) method. The correlation between gelation of PVdF solution and the magnitude of x12 value was discussed. The solvents used were hexane, cyclohexanone, γ-butyrolactone, and N, N-dimethylformamide. Moreover, sol-gel transition curve was determined for four samples with different molecular weights.<BR>The interaction parameter x12 obtained for each PVdF/solvent system increased slowly with decreasing temperature. The gelation of PVdF occurred with decreasing temperature for the following two systems: one was the system where the parameter x12 increased passing through 0.5 such as the system PVdF/cyclohexanone; the other was the system where x12 approached 0.5 such as the system PVdF/γ-butyrolactone. The sol-gel transition curve shifted to lower concentration with increasing molecular weight.

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