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首页> 外文期刊>Journal of Applied Polymer Science >EXTRUSION, FIBER FORMATION, AND CHARACTERIZATION OF THERMOTROPIC LIQUID CRYSTALLINE COPOLYESTERS
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EXTRUSION, FIBER FORMATION, AND CHARACTERIZATION OF THERMOTROPIC LIQUID CRYSTALLINE COPOLYESTERS

机译：热液液晶共聚酯的挤出，纤维形成和表征

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The flow behavior and the effect of the spinning conditions on the fiber properties and structure of the copolyesters, i.e., samples of copoly(p-hydroxybenzoate-bisphenol A terephthalate), were investigated. The experimental results indicated that the apparent viscosity was affected significantly by shear rate, melt temperature, and p-hydroxybenzoate unit content; and the copolyester melts exhibit highly shear thinning behavior. The fiber modulus increase with the increase in extrusion temperature and draw-down ratio, and the tensile properties could be improved when a high spin draw ratio was used. High birefringence, indicating the presence of mesophase, was observed on a hot-stage polarizing microscope. Scanning electron microscopy revealed that the fibers spun at relatively high temperature had a well-developed, highly oriented fibrillar structure. The fibers spun at low temperatures, however, were poorly oriented and nonfibrillar in character. (C) 1997 John Wiley & Sons, Inc. [References: 18]
机译：研究了共聚酯（对羟基苯甲酸酯-双酚A对苯二甲酸酯）样品的流动行为以及纺丝条件对共聚酯纤维性能和结构的影响。实验结果表明，表观粘度受剪切速率，熔融温度和对羟基苯甲酸酯单元含量的影响很大。共聚酯熔体表现出高剪切稀化行为。纤维模量随着挤出温度和拉伸比的增加而增加，并且当使用高旋转拉伸比时，可以改善拉伸性能。在热台偏振显微镜上观察到高双折射，表明存在中间相。扫描电子显微镜显示，在较高温度下纺丝的纤维具有发达的，高度取向的原纤维结构。然而，在低温下纺丝的纤维取向差且无原纤维特性。 （C）1997 John Wiley＆Sons，Inc. [参考：18]

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