ポリエチレンテレフタレート繊維の自己伸長について

抄録

Through the measurements of dimensional change and birefringence, density and small-and wide-angle X-ray diffraction of drawn poly(ethylene terephthalate) (PET) fibers after the heat treatment under various conditions, relations between the fine structure and characteristics of spontaneous elongation was investigated. It was concluded that in the PET fibers which show spontaneous elongation: 1) Crystallites are oriented to a certain direction with respect to the fiber axis, while molecular chains in the amorphous region are in the unoriented state. 2) Crystalline region is composed of folded chain crystals. 3) Crystalline regions are contacted with each other at a particular angle. It was also considered that irreversible spontaneous elongation of PET fiber is associated with the growth of crystallites, and therefore the elongation ratio increases with an increase in the heat-treatment temperature.