Abstract
Core-shell composite particles were prepared by a heterocoagulation and annealing process, in which control of the number of chemical linkages in the interfacial zone without changing other properties was possible using five kinds of small size shell particles (SP) with different carboxyl charge density and one large size core particle (LP) with an epoxy functional group. These functional groups were capable of associating with one another through chemical reaction by thermal treatment. With increase of surface functionality of SP, the toughness was found to be higher. This indicated that a higher number of interfacial linkages between core and shell materials resulted in an increase in the critical stress intensity factor KIc of the modified poly(methyl methacrylate) (PMMA) composite. The interfacial properties between core and shell phase therefore play an important role in the impact behaviour of composite materials. ©1997 SCI
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