EFFECT OF STRUCTURE OF EPOXY NETWORK ON INTERFACIAL SHEAR-STRENGTH INGLASS EPOXY COMPOSITES - II

The effect of the structure of an epoxy network on the interfacial she ar strength of glass epoxy composites is described. Diglycidyl ether o f bisphenol-A (DGEBA) cured by using stoichiometric amounts of aromati c diamines [i.e., 1,3-bis(4-aminophenoxy)benzene, 1,4-bis(4-aminopheno xy)benzene, 2,2'-bis [4-(4-aminophenoxy) phenyl] propane, 4,4'-bis(ami nophenoxy) benzophenone, bis[4-(4-aminophenoxy)phenyl]sulfone, and 4,4 '-diaminodiphenyl methane] was used as the matrix. Interfacial shear s trength, determined by using the fragmentation technique, was found to depend on the polarity of the epoxy network and was highest when DGEB A cured with bis [4-(4-aminophenoxy)phenyl] sulfone was used as the ma trix. (C) 1998 John Wi ley & Sons, Inc.