Effects of crystallinity and supermolecular formations on the interfacial shear strength and adhesion in GF/PP composites |
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Authors: | F Hoecker J Karger-Kocsis |
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Affiliation: | (1) Institut für Verbundwerkstoffe GmbH, Universität Kaiserslautern, Postfach 3049, D-67653 Kaiserslautern, Germany |
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Abstract: | Aim of this study was to screen the morphological effects on the interfacial shear strength ( i) in glass fibre (GF) reinforced isotactic polypropylene (iPP) model composites. i was determined by a modified single fibre pull-out technique. It was established that the relation between i (5–6 MPa) and the yield stress of the iPP ( y 30 MPa) is at about 1:6 and that the i values were not influenced by the mophological superstructure set under isothermal crystallization conditions. Increased i was only observed when specimens were produced non-isothermally, by quenching ( i 9 MPa). This improvement could not be related to thermal shrinkage stresses. The enhancement in i 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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