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对差示扫描量热(DSC)测得的聚对苯二甲酸乙二酯(PET)双冷结晶峰。现用红外光谱、吸水动力学和X-光衍射等手段,对其本质作进一步探讨。结果表明,PET在潮湿环境放置过程中,其分子链构象未观察到变化,从而提出了PET在玻璃化温度(T_g)以下超分子结构仍进行有序化的不同看法并对双冷结晶峰的本质作了初步解释。 1.从高温的冷结昌向低温的冷结昌转化过程的表征
Double cold crystallization peak of polyethylene terephthalate (PET) as measured by differential scanning calorimetry (DSC). Now using infrared spectroscopy, water absorption kinetics and X-ray diffraction and other means to further explore its nature. The results show that there is no change in the molecular chain conformation of PET during the wetting process. The different viewpoints that the supramolecular structure of PET is still under the glass transition temperature (T_g) Essential made a preliminary explanation. 1. Characterization of the process of transformation from cold to warm at low temperature