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Showing 1–2 of 2 results
Advanced filters: Author: Yukari Hosokawa Clear advanced filters

  • Control of the crystalline structure of poly(vinilydene fluoride) (PVDF) in a PVDF/poly(methylmethacrylate) (PMMA) blend were analyzed by varying the polymer blend ratio (PVDF/PMMA=60/40, 70/30 and 80/20 wt%) and the heat-treatment temperature (160–210 °C) just after the polymer melt. PVDF (form I) was limitedly obtained by heat treatment at 185 and 190 °C after blending PVDF/PMMA 70/30 wt%. The samples produced under other conditions indicated PVDF (form II). We assumed that PVDF crystalline structure became PVDF (form I) according to decrease of the crystallization rate by the highest compatibility between PVDF and PMMA.

    • Hideo Horibe
    • Yukari Hosokawa
    • Tetsuya Danno
    Research
    Polymer Journal
    Volume: 45, P: 1195-1201

  • The solvent evaporation rate in the production of three types of poly(vinylidene fluoride) (PVDF) crystalline structures by using the solvent casting method was quantified. The PVDF crystalline structures were predominantly determined by solvent evaporation rate. PVDF (form I) was obtained when the solvent evaporation rate was <0.0001 g min−1, PVDF (form II) was obtained when the solvent evaporation rate >0.2 g min−1 and PVDF (form III) was obtained when the solvent evaporation rate was from 0.03 to 0.00058 g min−1.

    • Hideo Horibe
    • Yasutaka Sasaki
    • Takashi Nishiyama
    Research
    Polymer Journal
    Volume: 46, P: 104-110