超临界二氧化碳处理对聚酯纤维结构及其性能的影响

用DSC、扫描电镜、X射线衍射、萨那蒙法对超临界二氧化碳处理聚酯纤维的熔点、表面形态结构、聚集态结构进行测定，并对处理后织物的收缩性能进行了分析探讨。实验结果表明：随着超临界二氧化碳处理温度、压力的提高，聚酯纤维的熔点、熔融热略有增加，纤维表面的低聚物增多，纤维的结晶度增加，取向度略有下降，同时聚酯织物的收缩率增加。预定型处理有助于提高聚酯纤维的热稳定性，降低二氧化碳处理对聚酯织物收缩率的影响。

Effect of Supercritical CO2 Treatment on the Structure and Properties of PET Fibers

Melting point, morphology and structure of aggregating state of PET fibers were investigated through DSC, SEM, WAXS and orientation analysis before and after supercritical CO_2 dyeing. Shrinkage has been also studied. The results of the experiments indicate that higher temperature and pressure induce higher melting point and melting enthalpy and higher crystallinity, more oligomer migrate from the inner part of the fiber to the surface. However, orientation of PET fiber decreases slightly after supercritical CO_2 treatment. The shrinkage percent increases with increasing temperature and pressure. Pre-heat setting before dyeing helps to improve thermo-stability and diminish the influence of supercritical CO_2 dyeing on shrinkage of the polyester fabrics.