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首页> 外文期刊>Journal of Applied Polymer Science >Effect of initial take-up speed on properties and structure of as-spun and drawn/heat-set poly(ethylene terephthalate) filaments
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Effect of initial take-up speed on properties and structure of as-spun and drawn/heat-set poly(ethylene terephthalate) filaments

机译：初始卷绕速度对初纺和拉伸/热定型聚对苯二甲酸乙二醇酯长丝性能和结构的影响

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摘要

The effect of initial take-up speed on the properties and structure of both as-spun and drawn/heat-set poly(ethylene terephthalate) filaments was characterized through measurements of birefringence, percent crystallinity, tensile properties, high temperature shrinkage, loss tangent temperature dependence, DSC melting behavior, and wide-angle (WAXS) and small-angle X-ray scattering (SAXS). While a steady trend toward improved as-spun filament orientation and tensile properties occurred with increasing initial take-up speed, the reduced drawability of these more structured precursor filaments resulted in corresponding drawn/heat-set filaments that were of relatively lower overall orientation and tensile strength. The observed trends in tenacity, initial modulus, and high temperature shrinkage of the drawn/heat-set filaments appeared to be well correlated with the extent and distribution of amorphous phase rigidity as perceived through inferences made from the loss tangent temperature dependence. The WAXS patterns of the drawn/heat-set samples indicated that these filaments all possess a well-developed and highly oriented crystalline structure. Application of a simple two phase model allowed the determination of an amorphous orientation factor, which for the drawn/heat-set filaments was generally found to decrease as the draw ratio imposed in order to achieve comparable levels of elongation to break decreased. The SAXS patterns of the drawn/heat-set filaments indicated that comparable long period spacings exist in all cases and that a transition from a four-point pattern to a two-point bar-shaped pattern occurred when the precursor filament possessed some significant amount of as-spun crystallinity. (C) 1998 John Wiley & Sons, Inc. [References: 38]
机译：通过测量双折射，百分结晶度，拉伸性能，高温收缩率，损耗角正切温度，表征了初始卷绕速度对初生和拉伸/热定型聚对苯二甲酸乙二醇酯长丝的性能和结构的影响。依赖性，DSC熔化行为以及广角（WAXS）和小角X射线散射（SAXS）。随着初始卷绕速度的提高，出现了改善初生长丝取向和拉伸性能的稳定趋势，但这些结构化程度更高的前体长丝的拉伸性降低，导致相应的拉伸/热定形长丝的总体取向和拉伸性相对较低强度。拉伸/热定形丝的强度，初始模量和高温收缩率的观察趋势似乎与非晶相刚度的程度和分布密切相关，这是根据损耗正切温度依赖性得出的推论得出的。拉伸/热定形样品的WAXS模式表明，这些长丝均具有发达的且高度取向的晶体结构。简单的两相模型的应用可以确定无定形取向因数，对于拉伸/热定形长丝，通常发现该因数会随着施加的拉伸比的降低而降低，以实现相当的断裂伸长率。拉伸/热定形细丝的SAXS图案表明，在所有情况下均存在相当长的间隔，并且当前体细丝具有大量的碳纳米管时，会发生从四点图案到两点条形图案的过渡。初晶。 （C）1998 John Wiley＆Sons，Inc. [参考：38]

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