抗紫外老化聚对苯撑苯并二噁唑(PBO)纤维的制备与表征

Preparation and Characterization of Poly(p-phenylene benzobisoxazole)(PBO) Fiber with Anti-ultraviolet Aging

通过化学添加2,5-二羟基对苯二甲酸(DHTA)共聚,以及添加金红石型纳米TiO2物理共混的方法,制备了聚对苯撑苯并二噁唑(PBO)的抗紫外改性纤维.考察了纤维的力学性能、特性粘度及表面形貌在紫外老化过程中的变化,并结合PBO纤维紫外加速老化后的红外分析,对PBO纤维的光老化机理进行了初步研究.结果表明,本实验所制备的DHPBO纤维以及DHPBO/n-TiO2纤维的抗紫外老化能力明显高于PBO纤维,并且金红石型纳米TiO2对PBO的抗紫外改性效果要优于有机紫外吸收剂(2,2'-(1,2-乙烷二基)双(4,1-亚苯基)双苯并噁唑).

The modified poly（p-phenylene benzobisoxazole）（PBO） fibers,which exhibit anti-ultraviolet properties,were prepared by chemical copolymerization and physical blend methods.Mechanical property,intrinsic viscosity,SEM and ATR-FTIR techniques were used to characterize the fiber change before and after UV accelerated aging.Based on ATR-FTIR of PBO fibers before and after UV exposure,the UV aging degradation mechanism of PBO fiber was proposed.The results indicate that the DHPBO and DHPBO/n-TiO2 fibers show significantly improved UV resistance compared with the PBO fiber.In addition,the UV resistance of nano-rutile-TiO2 was obviously better than that of 2,2＇-[ethylenedi（p-phenylene）]bisbenzoxazole.