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用声频共振法在 100—430°K温度范围内研究了结晶及拉伸取向对 PET纤维分子运动的影响。在研究的温度范围内PET出现两个转变,243°K(β_c),354—383°K(α_a)。拉 伸使α_a转变显著移向高温,而β_c转变基本上不随拉伸比改变,这说明PET纤维的拉伸主要改变了非晶区分子链间的相互作用。 根据高柳的力学模型及建议的方法从α_a及β_c转变的损耗模量峯值计算了PET的“结晶度”,说明用密度法测得的结晶度反映了晶区与晶区缺陷部分的总和。
The influence of crystallization and orientation on the molecular motion of PET fibers was investigated by the acoustic resonance method in the temperature range of 100-430 ° K. There were two transitions of PET at the studied temperature range of 243 ° K (β_c) and 354-383 ° K (α_a). The stretching causes the α_a transformation to shift to a high temperature remarkably, while the β_c transformation basically does not change with the stretching ratio, which indicates that the stretching of the PET fiber mainly changes the interaction between the molecular chains in the amorphous region. The “crystallinity” of PET was calculated from the loss modulus peaks of α_a and β_c according to the mechanics model of high willow and the proposed method. The crystallinity measured by density method reflects the sum of the defects of crystal region and crystal region.