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Abstract
Poly(methyl methacrylate)-grafted-natural rubber (Heveaplus MG) has been studied as a novel toughening agent for epoxy resin systems based on diglycidyl ether of bisphenol A (Shell Epikote 828), both in bulk and as an adhesive. Secondary and tertiary phase distributions were shown to be a function of the solubility parameter of the epoxy, and optimum bulk fracture toughness and adhesive joint failure strengths were thus achieved by controlling the resin solubility parameter. Adhesive joint strenghts were measured at −35, 20 and 50°C for formulations containing up to 7 parts per hundred of resin (pph) of MG rubber and 15 pph of carboxyl-terminated butadiene-acrylonitrile rubber, and were compared with that of a proprietary epoxy-based structural adhesive film under the same conditions.
Published Version
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