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本文用DSC、X-射线衍射分峰、红外光谱研究高、低速卷线PET纤维的固态结晶行为,探讨在玻璃化温度(Tg)和冷结晶温度(Tc)之间的温度结晶对冷结晶峰的影响。实试结果表明,高速的Tc随结晶时间和结晶温度而增加,低速的Tc随结晶时间和结晶温度而降低。说明在结晶过程中低速的无定形大分子通过滑移重排逐步有序,而高速的无定形大分子的局部取向逐步耗散。若以结晶前、后冷结晶热焓之差表示结晶量,则结晶时间和温度之间存在变换关系,该关系作者已用多元线性回归技术求得。此外,还发现高速的在各个特征温度结晶后的反式指数(Itrans)与冷结晶热焓(△HTc)之间的函数关系,恰好与原纤维的冷结晶峰上各点所表征的结晶速率相对应。从而说明在不同温度下PET结构单元中乙二醇的构象变化是影响结晶速率的因素。
In this paper, the solid-state crystallization behavior of high and low speed coiled PET fibers was studied by DSC, X-ray diffraction and infrared spectroscopy. The effects of temperature crystallization between glass transition temperature (Tg) and cold crystallization temperature (Tc) Impact. The experimental results show that the high-speed Tc increases with the crystallization time and crystallization temperature, while the low-speed Tc decreases with the crystallization time and crystallization temperature. It shows that the low-speed amorphous macromolecules are gradually ordered by slip rearrangement during the crystallization process, while the high-speed amorphous macromolecules are gradually dissipated in the local orientation. If the crystal before and after crystallization enthalpy difference crystallization volume, there is a relationship between the crystallization time and temperature conversion, the relationship between the authors have been using multiple linear regression technique. In addition, it was also found that the high-speed trans-index (Itrans) after crystallization at each characteristic temperature as a function of the cold crystallization enthalpy (ΔHTc) coincided with the crystallization rate characterized by the various points on the cold crystallization peak of fibrils Corresponding. Thus, the conformational changes of ethylene glycol in PET structural units at different temperatures are the factors affecting the crystallization rate.