Heat Degradation of Poly(styrene) in Extruding Cycles 2Effects of Molecular Weight

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  • KITAMURA Mitsunobu
    Department of Materials Science, School of Engineering, The University of Shiga Prefecture
  • TAKEUCHI Shota
    Department of Materials Science, School of Engineering, The University of Shiga Prefecture
  • MIYAGAWA Eiichi
    North Eastern Industrial Research Center of Shiga Prefecture
  • TOKUMITSU Katsuhisa
    Department of Materials Science, School of Engineering, The University of Shiga Prefecture
  • TANAKA Akira
    Department of Materials Science, School of Engineering, The University of Shiga Prefecture

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Other Title
  • ポリスチレンのマテリアルリサイクルにおける熱劣化２．分子量による影響
  • ポリスチレン ノ マテリアルリサイクル ニ オケル ネツ レッカ 2 ブンシリョウ ニ ヨル エイキョウ

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Abstract

Poly(styrene) samples (MW1C and G100C) were reprocessed in multiple cycles by a single-screw extruder. The reprocessed heat degraded samples were characterized by dynamic viscoelasticity and stress-strain measurement.<br> When the temperatures of heat degradation and the volume velocity of extrusion were particularly selected, the molecular weight (Mη) for the heat degradation samples was expressed by the time (t) required in extrusion without depending on original molecular weight. In blend system, the decrease in Mη was expressed by similar relationship for homo-system, suggesting that the synergy effect of blend on the heat degradation was neglected. Young's modulus (E) obtained from stress-strain curves did not change for both the virgin and the heat degraded samples. It is important to reprocess at temperature (T) as low as possible in order to increase the cycles number (n)<br>

Journal

  • Resources Processing

    Resources Processing 54 (3), 145-151, 2007

    The Resources Processing Society of Japan

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