【摘要】 聚对苯撑苯并二噁唑(PBO)纤维在应用过程中老化现象严重,研究其老化机理与防老化措施具有十分重要的意义。对国内外PBO纤维老化的最新研究进展进行了综述,PBO纤维的老化主要是光老化、原子氧老化以及湿热老化,并提出了相应的老化机理及防护措施。建议今后PBO纤维的防老化研究应着重在PBO的合成过程中增加其立构规整性,使PBO的相对分子质量分布变窄,同时,改进PBO的聚合、纺丝及后处理工艺,另外,还需进一步探索高模量PBO纤维的老化机理及防护措施。更多还原

【Abstract】 Poly( p-phenylene benzobisoxazole)( PBO) fiber has serious aging phenomenon during the application. It is significantly important to study the aging mechanism and anti-aging measures. The latest research progress on the aging of PBO fiber was reviewed in China and abroad. The aging of PBO fiber mainly comprises photoaging,atomic oxygen aging and damp-heat aging. The corresponding aging mechanism and protection measures were put forward. It was suggested that the anti-aging research of PBO fiber should be focused on the isotacticity enhancement of PBO during the synthesis process in order to narrow down the relative molecular mass distribution of PBO and the innovation of polymerization,spinning and after-treatment processes of PBO as well; moreover,the aging mechanism and the anti-aging measures of high-modulus PBO fiber should be further explored.更多还原