PBO纤维自然老化与加速老化的相关性研究  

Correlation between accelerated aging and natural aging of PBO fiber

作　　者：应灵慧[1] 汪益龙[1] 刘小云[1] 庄启昕[1] 韩哲文[1] 

机构地区：[1]华东理工大学特种功能高分子材料及相关技术教育部重点实验室,上海200237

出　　处：《固体火箭技术》2013年第1期107-112,共6页Journal of Solid Rocket Technology

基　　金：国家自然科学基金(50703010;50973028)

摘　　要：研究了PBO纤维在户外自然暴晒实验中纤维强度和分子量的变化规律,发现PBO纤维在暴晒初期纤维强度下降较快,但随着老化时间的延长,纤维强度下降趋势逐渐变缓。此外,文章还对比研究了人工加速老化过程中纤维强度的下降规律,并以强度保持率为参照标准,分别从老化时间和总辐照能量两方面比较了2种老化实验的相关性和加速因子。研究发现,基于老化时间作为参照时,在老化的不同阶段,加速因子的变化较大;而基于总辐照能量作为参照时,在纤维强度降低到原始强度的64%之前,可较好地利用人工加速老化实验结果来预测其在户外环境下的老化失效行为。The change law of tensile strength and intrinsic viscosity of PB0 fiber during natural exposure was studied. The re- suits show that the strength of PBO fiber declines fast in the beginning of exposure, and then the trend of decline becomes slow. The correlation between natural exposure and accelerated aging for PB0 fiber was also investigated in terms of aging time and irradiation accumulation using strength of fiber as reference standard. It is found that the accelerating factor based on aging time changed great- ly at different stages of aging, while the accelerating factor based on irradiance accumulation almost unchanged till the strength of PBO fiber decline to the 64% of its originally strength. So,this method can be used to predict the failure behavior of PBO fiber in the natural environment.

关 键 词：PBO纤维 光降解 自然老化 相关性 

分 类 号：V258.3[一般工业技术—材料科学与工程]