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Rubber‐Modified epoxies. IV. Influence of morphology on mechanical properties
Author(s) -
Verchere D.,
Pascault J. P.,
Sautereau H.,
Moschiar S. M.,
Riccardi C. C.,
Williams R. J. J.
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070430208
Subject(s) - materials science , composite material , epoxy , volume fraction , natural rubber , toughness , nitrile rubber , fracture toughness , modulus
The mechanical properties of a system consisting of a bisphenol A diglycidylether (DGEBA) expoxy, cured with a cycloaliphatic diamine (4,4′‐diamino‐3,3 dimethyldicyclohexyl‐methane, 3DCM), in the presence of an epoxy‐terminated butadiene‐acrylonitrile random copolymer (ETBN), was studied as a function of the cure schedule and the initial rubber concentration. Fracture toughness ( K Ic ) and fracture energy ( G Ic ) were increased, while Young's modulus and yield strength decreased slightly with increasing volume fraction of the dispersed phase. We show that there is no significant influence of the precure schedule and of the various observed particle diameters on the mechanical properties for a constant rubber volume fraction. In our case, the main deformation process in the rubber‐modified epoxy networks is shear yielding while cavitation is negligible.