The objective of this work is the implementation of a free radical process which enables a grafting and crosslinking possibility in the polypropylene (PP) glass fibre (GF) interphase. For this purpose hydroperoxides were generated along the polymer backbone of the used PP film former, by an electron beam treatment. During a subsequently thermal treatment these peroxides decay to radicals which initiate a grafting and/or cross-linking reaction. To demonstrate the effect of cross-linking in the interphase on the composite strength, transverse tensile tests on unidirectional GF/PP composites and rheology test were applied.
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