Structure-properties relationships for densely crosslinked epoxide-amine systems based on epoxide or amine mixtures

Four series of samples based on epoxide mixtures crosslinked by aromatic diamines or single epoxides crosslinked by amine mixtures were studied by dynamic thermomechanical analysis, differential scanning calorimetry and heat deflection temperature measurements. The glass transition temperature (T _g) was found to increase with the crosslink density in each series, but was independent of the cohesive energy or hydrogen bonding densities. A previously established method ofT _g prediction was shown to be applicable to these systems. In one series, (diglycidyl ether or bisphenol A/triglycidyl derivative ofp-amino phenol/diamino diphenyl methane), a phase separation occurred during the sample preparation. TheT _g-structure relationships were used to determine the phase composition.