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首页> 外文期刊>Journal of Applied Polymer Science >Study on photoaging of poly(p-phenylene benzobisoxazole) fiber
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Study on photoaging of poly(p-phenylene benzobisoxazole) fiber

机译：聚对苯撑苯并二恶唑纤维的光老化研究

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摘要

As a kind of rig-rod-like polymer, poly(p-phenylene benzobisoxazole) (PBO) has received great interest because of its excellent mechanical properties and good thermal stability. The use of PBO fibers, however, is limited due to its low sunlight stability. In this work, the photoaging of PBO fibers, as well as the effects of oxygen and moisture on their photoaging, is investigated by tensile strength measurements, infrared spectroscopy, molecular mass determination, and scanning electron microscopy. It is first time to find that the photoaging of PBO fibers includes two development stages. The physical aging is the dominate factor at the first stage of photoaging relative to the second stage, in which the chemical aging is the dominate factor. In the first degradation stage, long defects appear and develop parallel to the fiber axis. Little chemical change occurs in this stage. In the second degradation stage, the molecular mass of PBO decreases and chemical degradation occurs. Oxygen accelerates the occurrence of chemical degradation. It is also found PBO fibers are more stable for photoaging when moisture and oxygen are isolated.
机译：聚（对亚苯基苯并双恶唑）（PBO）作为一种钻杆状聚合物，因其优异的机械性能和良好的热稳定性而备受关注。然而，由于其低的日光稳定性，限制了PBO纤维的使用。在这项工作中，通过拉伸强度测量，红外光谱，分子量测定和扫描电子显微镜研究了PBO纤维的光老化以及氧和水分对其光老化的影响。首次发现PBO纤维的光老化包括两个发展阶段。相对于第二阶段，物理老化是光老化第一阶段的主要因素，在第二阶段中，化学老化是主要因素。在第一个降解阶段，会出现长缺陷并平行于纤维轴发展。在这一阶段几乎没有化学变化发生。在第二降解阶段，PBO的分子量下降，发生化学降解。氧气会加速化学降解的发生。还发现隔离水分和氧气时，PBO纤维对光老化更稳定。

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