Fiber structure development of poly(ethylene terephthalate-co-isophthalate) copolymer
Fiber structure development of poly(ethylene terephthalate-co-isophthalate) copolymer
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DOI：
10.1016/j.polymer.2022.124708
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发表时间：
2022-03-07
期刊：
影响因子：
4.6
通讯作者：
Funatsu, Yoshitsugu
中科院分区：
文献类型：
--
作者：
Tomisawa, Ren;Okazaki, Mako;Funatsu, Yoshitsugu
间苯二甲酸共聚是控制聚对苯二甲酸乙二酯纤维性能的常用方法。为了探讨控制机制，共聚取向诱导结晶行为和近晶相形成后颈缩的影响进行了分析，通过获取连续拉伸过程中的X射线衍射图像。间苯二甲酸共聚抑制取向诱导结晶过程中的纺丝和拉伸过程。它还降低了近晶相的d-间距和表观厚度，而近晶相的积分强度和长度不受影响。拉伸后纤维的熔点和结晶度降低，热收缩率增加，而双折射率和拉伸强度基本不变。分子取向和微纤丝长度几乎没有变化，这可能导致纤维强度被保留。
Isophthalic acid copolymerization is generally used to control the properties of polyethylene terephthalate fiber. To investigate the controlling mechanism, the effects of copolymerization on orientation-induced crystallization behavior and smectic phase formation after necking were analyzed by acquiring X-ray diffraction images during the continuous drawing process. Isophthalic acid copolymerization suppressed orientation-induced crystallization during the spinning and drawing processes. It also decreased the d-spacing and apparent thickness of the smectic phase, while the integrated intensity and length of the smectic phase were not affected. Furthermore, the melting point and crystallinity decreased, and the thermal shrinkage of drawn fibers increased, while the birefringence and tensile strength were unchanged. Almost no change in the molecular orientation and microfibril length presumably resulted in the fiber strength being retained.