Studies On UV-photocrosslinking Of Polymers

In this paper, the mixture of Polyamide1010(PA1010), benzo phenone (BP) and triallyl isocyanurate (TAIC) was prepared through melt blending, which was UV-photocrosslinked and a series of samples of different degree of crosslinking were obtained. The effect of irradiation time on gel content, mechanical properties, insulation resistance, water resistance, heat resistance, Crystallization and melting behavior was studied. The results showed that, with increasing the irradiation time, the gel content increased gradually. The tensile strength of PA1010increased first and then decreased, and it was the highest when the irradiation time was3s. The elongation at break decreased gradually. The Vicat softening temperature increased first and then decreased. Insulation resistance and water resistance increased significantly. Moreover, melting point, crystallization temperature and the degree of perfection of crystals decreased.Polyolefin elastomer (POE) was UV-photocrosslinked with BP as photo-initiator and TAIC as crosslinker. The effect of irradiation time on gel content and properties was studied. The results of gel content, mechanical properties, insulation resistance, Vicat softening temperature, thermogravimetric analysis (TGA) and Dynamic mechanical thermal analysis (DMTA) measurements showed that the gel content increased with increasing photocrosslinking time. The tensile strength and tensile fracture energy increased first and then decreased, and they reached the maximum while photocrosslinking time was2s. The elongation at break decreased gradually. The hardness, Vicat softening point, thermal decomposition temperature of POE increased first and then decreased, while the insulation resistance increased significantly. The storage modulus and glass transition temperature (Tg) of POE increased first and then decreased.Acrylonitrile-butadiene-styrene (ABS) samples with different degree of crosslinking were prepared by UV-photocrosslinking with2,2-dimethoxy-2-phenylacetophenone (BDK) as photo-initiator and TAIC as crosslinker. The effect of photocrosslinking time on gel content and properties was studied. The results showed that the gel content and insulation resistance of ABS increased with increasing photocrosslinking time. The tensile strength increased first and then decreased, it reached the maximum while photocrosslinking time was3s. The elongation at break decreased. Vicat softening point increased first and then decreased. Thermal decomposition temperature and hardness rose gradually, while electrical insulation resistance and water resistance increased significantly.