Some thermal studies on poly(ethylene terephthalate)

摘要

AbstractDifferential thermal analysis (DTA) and thermogravimetric analysis (TGA) of poly(ethylene terephthalate) has been carried out on samples of amorphous, cold‐drawn, heat‐crystallized, and acetone‐crystallized polymer. From DTA it appears that for amorphous material a prolonged “secondary” crystallization process follows a primary process in the region of 140°C. For cold‐drawn polymer, heat treatment does not reflect differences observed in previous x‐ray diffraction studies. The TGA gives evidence that a high temperature endothermic peak observed in DTA may not be directly associated with depolymerization. With acetone‐crystallized material a high degree of acetone reten