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首页> 外文期刊>Journal of Applied Polymer Science >CHARACTERIZATION OF THE PHYSICAL AND MOLECULAR STRUCTURE OF THERMALLY ELONGATING POLY(ETHYLENE TEREPHTHALATE) FIBERS
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CHARACTERIZATION OF THE PHYSICAL AND MOLECULAR STRUCTURE OF THERMALLY ELONGATING POLY(ETHYLENE TEREPHTHALATE) FIBERS

机译：热延伸聚对苯二甲酸乙二酯纤维的物理和分子结构的表征

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摘要

The mechanism of thermally induced elongation in poly(ethylene terephthalate) fiber spun at 3500 m min(-1) has been examined. This partially oriented fiber has a crystalline content of about 25% and a high degree of orientation. The effect of time and tension during heat treatment was examined, and it was found that yarns that were allowed to relax during an initial brief heat treatment at 130 degrees C subsequently elongated by up to 5% during a long heat treatment at the same temperature. Yarns that were not allowed to relax during the brief heat treatment did not elongate on subsequent heating. The morphological and mechanical changes associated with these processes have been studied using differential scanning calorimetry, X-ray diffraction (XRD), birefringence measurement, microscopy, and tensile testing. A large increase in crystallinity was observed during the brief heat treatment, but a much smaller increase took place during the long heat treatment. XRD indicated that substantial crystal reorganization occurred during both heat treatments, but c-axis growth was most significant in those materials that elongated during long heat treatment. It is proposed that it is this c-axis growth, in conjunction with conversion of disordered amorphous material into oriented crystalline material, that is responsible for the observed elongation. (C) 1997 John Wiley & Sons, Inc. [References: 11]
机译：已经研究了在3500 m min（-1）旋转的聚对苯二甲酸乙二酯纤维中热诱导伸长的机理。这种部分取向的纤维具有约25％的晶体含量和高取向度。研究了热处理期间的时间和张力的影响，发现在最初的短暂的130℃热处理期间松弛的纱线随后在相同温度下的长时间热处理期间伸长了5％。在短暂的热处理期间不允许松弛的纱线在随后的加热中不会伸长。已使用差示扫描量热法，X射线衍射（XRD），双折射测量，显微镜和拉伸试验研究了与这些过程相关的形态和机械变化。在短暂的热处理过程中观察到结晶度大幅度增加，但在长时间的热处理过程中发生了小得多的增加。 XRD表明两种热处理过程中均发生了明显的晶体重组，但在长时间热处理后伸长的那些材料中，c轴生长最为明显。有人提出，正是这种c轴增长与无序非晶态材料向定向结晶态材料的转化相结合，才是观察到的伸长率的原因。 （C）1997 John Wiley＆Sons，Inc. [参考：11]

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