Curing agent-dependent localization of carbon black in thermoplastic vulcanizates
Résumé
PP/EPDM Thermoplastic Vulcanizate (TPV) filled with carbon black (CB) has been prepared and the localization of the filler in the blend was depending on the crosslinking chemistry: in the rubber phase when the EPDM was crosslinked with phenolic resin (resol) and at the interface when the EPDM was crosslinked with dicumyl peroxide (DCP). It was proved, based on model reactions that mimicked what could happen during the process at high temperature, that DCP led to polymer chains grafting at the surface of the CB. This phenomenon was additional to the classical EPDM crosslinking and PP β-scission reactions. These reactions involved a modification of the interfacial tensions within this ternary blend, and explained preferentially the carbon black localization at the interface between the PP and the EPDM.
Domaines
Chimie
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