Alcoholysis of Polycarbonate with Benzophenone Derivatives in Twin Screw Extruder.

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  • MAKIMURA Yoichiro
    Department of Polymer Science and Engineering, Kyoto Institute of Technology
  • YOSHIDA Eri
    Department of Polymer Science and Engineering, Kyoto Institute of Technology
  • KITAO Toshio
    Department of Polymer Science and Engineering, Kyoto Institute of Technology

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Other Title
  • 二軸押出機内におけるポリカーボネートとベンゾフェノン誘導体とのアルコリシス
  • 2ジク オシダシキナイ ニ オケル ポリカーボネート ト ベンゾフェノン ユウ

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Abstract

Modification of polycarbonate (PC) with 2, 4-dihydroxybenzophenone (DHBP) was performed in the presence of FeCl3 as a catalyst in a twin screw extruder. The quantity of DHBP which had reacted with the end of PC in the reaction product was determined from the characteristic UV absorbance at 326nm which may be keto-enol tautomerization between the carbonyl and hydroxy group at 2 position of 2, 4-dihydroxyphenyl. The conversion of DHBP was almost linear with respect to both screw driving speed and reaction time. For example, the conversion increased monotonically with time and reached 100% after 23min, when PC involving 10-2eq. of DHBP and 5.0×10-4, eq. of FeCl3 to one carbonate bond was fed in the twin screw extruder and operated at 60 rpm of screw revolution rate at 255°C. The test piece prepared from the reaction product was subjected to an accelerated weathering test for evaluating the changes in its tensile and izod impact strengths, and compared with those of the test pieces made from raw PC and PC merely mixed with DHBP and FeCl3. After 144 h, no change was found in both strengths of the test piece prepared from reaction product, whereas significant decreases were recognized in tensile and izod strengths for the test pieces made from the latter two.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 54 (2), 79-86, 1997

    The Society of Polymer Science, Japan

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