Composition-dependent fracture toughness of ROMP-based Dilulin/dicyclopentadiene copolymers

摘要

The fracture toughness of a series of ringopening metathesis polymerization-based Dilulin/dicyclopentadiene (DCPD) copolymers was evaluated by utilizing the essential work of fracture method and the structurefracture property relationship was thoroughly analyzed. Both dynamic mechanical analyzer and scanning electron microscope demonstrated a reaction-induced phase separation in the copolymers. The copolymers’ compositiondependent morphologies showed a significant effect on their fracture behavior. The maximum value for the essential work of fracture was found with Dil30DCPD70, which may be explained by their less heterogeneous structure and high cross-link density. The highest nonessential work of fracture was observed with samples made from Dil40DCPD60, which is possibly a consequence of the formation of a rigid DCPD-phase.