Temperature dependence of the interfacial shear strength in glass–fibre polypropylene composites

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The present work focuses on further investigation of the hypothesis that a significant fraction of the level of apparent IFSS in glass fibre-reinforced thermoplastic composites can be attributed to a combination of thermal residual stress and static friction at the fibre-polymer interface. In order to obtain information on the temperature dependence of glass fibre – polypropylene IFSS a thermo-mechanical analyser has been adapted to enable interfacial microbond testing to be carried out in a well controlled temperature environment. Test results obtained by TMA-microbond testing showed excellent comparability with those obtained by normal microbond testing. The temperature dependence of IFSS of glass fibre – polypropylene was measured in the range from -40°C up to 100°C. The IFSS showed a highly significant inverse dependence on testing temperature with a major increase in the glass transition region of the PP matrix. It is shown that approximately 70% of the apparent room temperature IFSS in this system can be attributed to residual radial compressive stress at the fibre-matrix interface.
Original languageEnglish
Pages (from-to)1600-1605
Number of pages6
JournalComposites Science and Technology
Issue number13
Early online date22 Jul 2011
Publication statusPublished - 9 Sept 2011


  • glass fibres
  • fibre/matrix bond
  • interfacial strength
  • residual stress
  • thermoplastic composites


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