Abstract
Abstract Anhydride-terminated polyurethaneimide (AnTPU) prepolymers synthesized from polyether (PTMG)- or polyester (PBA)-diol, 4,4′-diphenylmethane diisocyanate (MDI), and benzophenonetetracarboxylic dianhydride (BTDA), were used to modify the toughness of bisphenol-A diglycidyl ether epoxy resin cured with diaminodiphenyl sulfone. From the experimental results, it was shown that these modified networks displayed a significantly improved fracture toughness. A dynamic differential scanning calorimetry (DSC) scan for an exothermic reaction of curing indicated that the presence of AnTPU prepolymer could slow down the reaction of DGEBA with the curing agent. The toughening mechanism is discussed based on the morphological and dynamical mechanical behavior of the modified epoxy network. Scanning electron microscopy showed that PTMG-based ATPU-modified epoxy had a two-phase structure. In contrast, the PBA-based ATPU-modified epoxy network showed a homogeneous morphology and consequently less effect on toughening.
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