涤纶高速纺预取向丝的动态力学性质研究

本文对1500—5000米/分纺速的PET预取向丝进行动态力学试验,其α内耗峰表现为三种情况:α_1、α_2单峰及介于这两者之间的α_1、α_2峰的速加峰。这反映了随纺速增加,预取向丝非晶态结构从自由非晶态-双重非晶态-网络间非晶态的结构变化。 为了把预取向丝的分子运动与纤维成形、结构与力学性质联系起来,我们引入了分子运动参数ψ,并定义ψ=H_(max)~?W~(-b)T_(max)~(-c)。实验结果表明,分子运动参数甲与其结构参数、力学性质有很好的相关性。

STUDY OF DYNAMIC MECHANICAL PROPERTIES OF PREORIENTED PET YARNS IN HIGH SPEED SPINNING

In this paper the dynamic mechanical preperties of POY spun at 1500-5000 m/min have been studied. Three peaks of a loss tangent have been shown: α1, α2 and the superposition of α1, α2. It reflects that as the spinning speed increases the amorphous regions of POY change from liberal to double and finally to a network.In order to correlate the molecular motion, the fibre formation and structure with the mechanical properties of POY, we introduce a molecular motion parameter which can be defined as. Experimental results show that there is a good relationship among , structure parameter and mechanical properties.