Study On The Curing Process And Thermal Property Of Poly (Ethyleneglycol)-based Amino-terminated Polyurethanes/Epoxy Resin

Poly (ethylene glycol)-based amino-terminated polyurethane (ATPU) is a novel kind of flexible curing agent of epoxy resin, containing both flexible chains and rigid groups. This novel curing agent can increase the strength and toughness of epoxy resin. The dissertation mainly studied the curing processing characteristics, curing reaction mechanism and curing reaction kinetic of ATPU/E-44 adhesive, while the thermal decomposition kinetics and the dynamic mechanical behavior of cured adhesive were also studied.In this paper, Based on the synthesis of the novel curing agent ATPU the influence of the type and the amount of curing agent ATPU on the curing reaction processing and curing reaction kinetic were studied by DSC method. The results showed that the amount of ATPU curing agent have an obvious influence on the curing reaction heat and curing degree. With increasing the amount of the curing agent ATPU, the curing reaction heat and curing degree increases. The curing reaction active energy of the ATPU-2/E-44 adhesive is lower than that of ATPU-1.5/E-44 adhesive, which indicates that the curing agent ATPU-2 have better curing reactivity.The FTIR spectra were used to characteristic the cured epoxy resin. The results showed that the curing time and curing temperature have great effects on the curing processing and curing reaction mechanism; the higher curing temperature would increase the curing degree.The TG-DTA results showed that the decomposition temperature of the cured adhesive of ATPU-2/E-44 system is higher than that of the cured adhesive of ATPU-1.5/E-44 system, which indicates that the cured adhesive of ATPU-2/E-44 system have better heat resistance. The DMA study showed that the cured adhesive of ATPU-2/E-44 system has higher glass transition temperature and dynamic modulus.