回收瓶片聚酯POY与普通聚酯POY结构性能比较

为了确定合理的后加工工艺，要充分考虑POY的各种性能指标，保证最终DTY的优良性能。文章采用差示扫描量热仪（DSc）、X射线衍射仪（XRD）、声速取向测量仪、单纱强力仪等对回收瓶片聚酯POY与普通聚酯POY的结构性能进行表征和比较。结果表明，回收瓶片聚酯POY与普通聚酯POY存在一定的差异：与普通聚酯POY相比，回收瓶片聚酯POY的结晶结构较差，玻璃化温度、冷结晶温度、熔点、结晶度较低；取向度较大；断裂强度、断裂伸长率较高；沸水收缩率较高，尺寸稳定性差。

Structure and Properties Comparison of Recycling Bottle Flakes POY and Ordinary POY

Differential scanning calorimeter （DSC）, X-ray diffraction （XRD）, sound velocimeter and single fiber tensile testers are used to analyze the structure and properties of recycling bottle {lakes POY and ordinary POY. The results show that there are differences between recycling bottle flakes POY and ordinary POYt compared with ordinary POY, the crystal structure of recycling bottle flakes POY is worse, and Tg, T,, Tm and crystallinity are lower; the orientation is higher; the breaking strength, break- ing elongation are greater; the boiling water shrinkage rate are greater, and the dimensional stability is worse. While determining the post processing, various performance indicators and technological parame- ters of POY should be taken into consideration, so as to guarantee the ultimate good performance of DTY.