高性能PBO纤维表面改性及抗紫外光性能研究

摘要

采用多聚磷酸(PPA)的乙酸溶液和PPA的乙醇溶液对对苯撑苯并二噁唑纤维(PBO纤维)进行表面改性,研究了PPA对PBO纤维表面改性的影响;采用添加紫外光吸收剂的脂环族环氧树脂涂料对PPA表面改性后的PBO纤维进行涂覆处理,采用环境扫描电镜(SEM)以及力学性能测试等表征手段探讨紫外光吸收剂对PBO纤维抗紫外性能的影响.研究结果表明,PPA溶液对PBO纤维表面的溶胀与刻蚀作用随着溶液中PPA质量分数增加而增加,PBO纤维的拉伸强度随PPA质量分数增加不断减小.PBO纤维经含有紫外光吸收剂UV-328的脂环族环氧树脂的涂料涂覆处理后,UV-328和脂环族环氧树脂的协同作用使PBO纤维的抗紫外光性能有显著的提高,PBO纤维拉伸强度的下降速度随着涂料中UV-328的质量分数的增加而减慢.当脂环族环氧树脂的涂料中UV-328的质量分数为5％时,PBO纤维在400 h的加速老化后其拉伸强度保留率可提高至60.3％.%Poly-p-phenylene benzobisthiazole fiber(PBO fiber)surface modification was carried out by using poly-acetic acid (PPA)acetic acid solution and PPA ethanol solution.The effect of PPA on the surface modification of PBO fiber was studied.PBO fiber surface modified by PPA were coated with an alicyclic epoxy resin coating with UV absorber.The effects of UV absorbers on the UV resistance of PBO fibers were investigated by means of scanning electron microscopy (SEM)and mechanical properties.The results show that swelling and etching effect of PPA solution on the surface of PBO fiber increased with the increase of the mass fraction of PPA in the solution,and the tensile strength of PBO fiber decreased with the increase of PPA mass fraction.After PBO fi-bers were coated with a coating alicyclic epoxy resin containing UV-328,the UV resistance of PBO was signifi-cantly increased by the synergistic effect of UV-328 and alicyclic epoxy resins.The decrease rate of tensile strength of PBO fiber decreased with the increase of the mass fraction of UV-328 in the coating.When the mass fraction of UV-328 in the coating of alicyclic epoxy resin is 5％,the retention rate of PBO fiber could increase to 60.3％ after 400 h accelerated aging.