While polyester fiber is subject to different draw ratio and heating temperature during high speed spinning, its original molecular orientation and crystallinity of polyester fiber are changed.
聚酯在高速纺丝过程中，施以不同的拉伸倍数与温度，会造成纤维结晶度与取向度的变化，从而影响纤维的物理性能。
The requirement of the orientation of PPTA chains during the polycondensation for high molecular weight of PPTA was explained by the polycondensated mode of PPTA molecules.
利用PPTA刚性分子发生逐步缩聚反应的缩聚模型，解释了在缩聚反应过程中，分子链的取向是提高PPTA相对分子质量的必要条件。
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