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Effects of crystallinity and supermolecular formations on the interfacial shear strength and adhesion in GF/PP composites

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Abstract

Aim of this study was to screen the morphological effects on the interfacial shear strength (τi) in glass fibre (GF) reinforced isotactic polypropylene (iPP) model composites. τi was determined by a modified single fibre pull-out technique. It was established that the relation between τi (5–6 MPa) and the yield stress of the iPP (σy≈30 MPa) is at about 1:6 and that the τi values were not influenced by the mophological superstructure set under isothermal crystallization conditions. Increased τi was only observed when specimens were produced non-isothermally, by quenching (τi≈9 MPa). This improvement could not be related to thermal shrinkage stresses. The enhancement in τi was attributed to better wetting and improved adhesion due to the enlarged amorphous PP (aPP)-phase. A schematic adhesion model considering the wetting behaviour of aPP and iPP was proposed.

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Authors and Affiliations

  1. Institut für Verbundwerkstoffe GmbH, Universität Kaiserslautern, Postfach 3049, D-67653, Kaiserslautern, Germany

    F. Hoecker & J. Karger-Kocsis

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  1. F. Hoecker
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  2. J. Karger-Kocsis
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Hoecker, F., Karger-Kocsis, J. Effects of crystallinity and supermolecular formations on the interfacial shear strength and adhesion in GF/PP composites. Polymer Bulletin 31, 707–714 (1993). https://doi.org/10.1007/BF00300131

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