Mechanical Properties of Poly(ethylene terephthalate) Bottle Flakes with Polyhydric Phenol Agents.

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  • 改質多価フェノール添加ポリエチレンテレフタレートボトル樹脂の機械的物性
  • カイシツ タカ フェノール テンカ ポリエチレンテレフタレートボトル ジュシ ノ キカイテキ ブッセイ

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Description

The number of the used poly (ethylene terephthalate) bottles (PET-bottles) for drinks which are collected has been increasing, while only a limited number of them can be reutilized by injection molding process. Here we investigated the thermal stability and recyclability of PET-bottle flakes (Re-PET) to which modified polyhydric phenol agent was added. The properties of the PET resin were evaluated after 3 repeated moldings. For the PET resin containing 0.02 wt% modified polyhydric phenol, the melt flow rate (MFR) increased from 41g/10 min to 52g/10min after 3 injection molding cycles, while the unfilled Re-PET resin control increased to 108g/10min. These results suggest that the Re-PET molecule depolymerized during the injection molding process due to the thermal energy and stress. On the other hand, we found that the modified polyhydric phenol reduced the crystallinity of the Re-PET resin to approximately 20% of that for the Re-PET at a mold surface temperature 40±3 (°C). These findings suggest that the addition of modified polyhydric phenol in Re-PET improved the stability of Re-PET. This implies that modified polyhydric phenol may be an effective method in the recycling process of PET-bottle flakes.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 59 (1), 29-34, 2002

    The Society of Polymer Science, Japan

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