Mechanical Strength and Tribological Properties of Diglycidyl Ether of Bisphenol-A Cured by Poly(Amide-Amidic Acid) and 4,4'-Diaminodiphenylsulfone

摘要

Diglycidyl ether of bisphenol-A (DGEBA) was cured by poly(amide-amidic acid) (PAA) and a commonly used curing agent, 4,4'-diaminodiphenylsulfone (DDS), in different molar ratios. It was found that the flexural strength, tensile strength, tribological properties, and thermal stability strongly depended on the molar ratios of PAA and DDS in the mixed curing agents. The highest flexural strength was obtained when DGEBA was cured with PAA individually. The tensile strength increased with the increase of PAA content in the mixed curing agents. The DGEBA cured with PAA containing curing agents possessed lower friction coefficient than that cured with DDS individually. The wear rate greatly decreased with the PAA content increasing in the mixed curing agent. Tribological behaviors and wear mechanisms were discussed by observing the morphology of wear debris and worn surfaces of the tested samples using scanning electron microscopy (SEM).