PET/PTT并列复合纤维制备工艺对其结构与性能的影响

以PET和PTT为原料通过熔融纺丝制备了具有自卷曲性能的并列复合纤维,研究了复合纤维制备工艺,探索并明确了两组分配比、牵伸倍率、热定形温度等参数对纤维断面形貌、力学性能、卷曲回弹性能的影响。试验结果表明:随着复合纤维中PTT组分从40%逐渐增加至60%,纤维断面保持8字形,且两相界面的熔接痕始终保持PTT相凸向PET相的形貌,同时纤维的弹性模量逐渐降低;牵伸倍率的增大能够显著提升纤维的强度、模量以及卷曲收缩率,但纤维的断裂伸长率及卷曲稳定度变差;在144~168℃范围内,热定形温度为156℃时,纤维的弹性模量、强度及卷曲收缩率较高,这主要是结晶度提高导致的。

Effect of Preparation Technology on Structure and Properties of PET/PTT Composite Fiber

A series of parallel composite fibers with self-crimping properties were prepared via melt spinning with PET and PTT as raw materials. The influence of preparation technology of the composite fiber includes the ratio of two components, drafting ratio, heat setting temperature on the cross-section morphology,mechanical properties and crimp resilience were investigated. The results show that with the increase of PTT content from 40% to 60%, the cross section of the composite fiber keeps figure 8, and the fusion mark of the two-phase interface always keeps the shape in which PTT phase protruding to PET phase, while the elastic modulus of the composite fiber decreases gradually. The strength, modulus and crimp recovery of the fiber are significantly increased with the increase of drafting ratio, but the elongation at break and crimp stability of the fiber become weak. In the heat setting temperature range in 144~168 ℃, the elastic modulus,strength and crimp recovery rate of the fiber are higher at 156 ℃, which is mainly caused by the increase of crystallinity.