Abstract
Diglycidyl ester of phthalic and terephthalic acids, and diglycidyl ether of bisphenol A were cured with aliphatic α, ω diamines with different chain length in the presence of salicylic acid as an accelerator.
For all the three systems, the concentration of network chains, glass transition temperature, tensile strength, and tensile shear strength decreased, and the fatigue strength, impact tensile strength, elongation, and damping increased with the increasing number of methylene units of the curing agents. These behaviours were explained by the change of the energy dissipationability of the cured resins.
The phthalate type epoxide resin and bisphenol- A -type resin showed about the same fatigue strength. However, the fatigue strength of the terephthalate resin was two times larger. These results were explained from the mobility and the energy dissipationability of the network chains.
