自卷曲复合长丝PET/PTT纺丝工艺及性能

根据PET、PTT聚合物的特点，介绍了PET/PTT复合长丝的纺丝成形工艺，测试分析了PET/PTT长丝的截面与纵向形态、卷曲形态、热收缩率及其拉伸力学性能。实验结果表明：制得的PET/PTT长丝是以PET和PTT平行并列的双侧结构构成的复合长丝；该长丝经热处理后形成了永久性三维卷曲形态及结构；沸水处理后PET/PTT复合长丝的初始模量、断裂强度有所降低，断裂伸长增大；该复合长丝中PET与PTT的比例对其卷曲性能、弹性回复率、拉伸力学性能、沸水收缩率等都有较大的影响。

Spinning and properties of PET/PTT self-crimp composite filament yarns

This paper introduces the spinning process of PET/PTT self-crimp composite filament yarns according to the properties of PET and PTT polymers. The cross and longitudinal sections, crimp morphology, hot shrinkage, and tensile properties of PET/PTT self-crimp composite filament yarns were tested. The results showed that the side-by-side structure makes the composite filament yarns with a permanent three-dimensional curl after heat treatment. The initial modulus and breaking strength of the yarns after boiling water treatment decrease while breaking elongation increases. Blend ratio has great influences on the physical properties of the yarns such as crimp property, elastic recovery, tensile properties, and boiling water shrinkage.