In-situ Observation of Accelerating Behavior in Hydrolysis at Interface of Green Composites Using Model Specimens

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  • TANAKA Mototsugu
    Department of Mechanical Engineering, Kanazawa Institute of Technology
  • OTA Kazuki
    Graduate Student, Kanazawa Institute of Technology
  • MINAMIDE Yuya
    Undergraduate Student, Kanazawa Institute of Technology
  • SAITO Hiroshi
    Research Laboratory for Integrated Technological Systems, Kanazawa Institute of Technology
  • KIMPARA Isao
    Research Laboratory for Integrated Technological Systems, Kanazawa Institute of Technology

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Other Title
  • モデル試験片を用いたグリーンコンポジット界面での加水分解促進挙動のその場観察
  • モデル シケンヘン オ モチイタ グリーンコンポジット カイメン デ ノ カスイブンカイ ソクシン キョドウ ノ ソノ バ カンサツ

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Description

Recently, green composites (GC) using natural fibers and biodegradable resin have been developed and investigated, aiming at contribution to preservation and improvement of the global environment. However, in composites using biodegradable resin as matrix, it is considered that the degradation by hydrolysis might be selectively accelerated at the interface. In the present study, we aim to clarify the local hydrolysis behavior at interface in fiber reinforced plastics using biodegradable resin as matrix. Here, we prepared a new type of GC model specimen, where the inside interfacial debonding can be observed directly, using a glass rod (GR) as fiber and polybutylene succinate adipate (PBSA) as matrix. In-situ observation of the internal interfacial debonding behavior was carried out during tensile tests of GC model specimens after immersion into water within the range of 3 weeks of immersion time, where the tensile strength of PBSA matrix itself was not degraded. In addition, experimental results were discussed combined with a simple finite element analysis. As a result, it was demonstrated that the hydrolytic degradation speed of interface was much higher than that of matrix resin. It was considered that water molecules diffused in the free volume of resin and locally accumulated at the interface between fibers and resin, resulting in the acceleration of hydrolysis at the interface.

Journal

  • Materials System

    Materials System 31 (0), 31-36, 2013

    Materials System Research Laboratory, Kanazawa Institute of Technology

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