高卷曲聚醚酯/聚酯并列复合纤维的制备及其性能

针对聚对苯二甲酸丁二醇酯/聚对苯二甲酸乙二醇酯(PBT/PET)并列复合纤维存在的卷曲弹性不足、服用舒适性差等问题，选用四氢呋喃均聚醚(PTMG)改性的PBT和常规PET作为原料，通过复合纺丝制备了PTMG-PBT/PET并列复合纤维，研究了PTMG质量分数对聚醚酯和复合纤维性能的影响，以及热处理工艺对复合纤维卷曲性能的影响。结果表明：随着PTMG质量分数的增加，聚醚酯的吸水率和吸湿率可达到4.10%和1.62%,接触角可达63.81°,复合纤维的卷曲性能也明显提高，卷曲率可达到48%;热处理可进一步提升复合纤维的卷曲性能，其中湿热处理效果比干热处理效果好，湿热处理后复合纤维的卷曲率和卷曲回复率可分别达到70%和55%;PTMG也可以提高复合纤维的常压上染率，最高可达到93.25%,比PBT/PET并列复合纤维高12%。

Preparation and properties of tetrahydrofuran homopolyether-polybutyleneterephthalate/polyethylene terephthalate parallel composite fiber

In view of insufficient crimp elasticity and poor wearing comfort of polybutylene terephthalate/polyethylene terephthalate (PBT/PET) parallel composite fibers, tetrahydrofuran homopolyether (PTMG) was selected to modify PBT and conventional PET were used as raw materials to prepare PTMG-PBT/PET parallel composite fibers by composite spinning. The effect of PTMG mass fraction on the properties of polyether ester and composite fibers, and the crimp properties of composite fibers by heat treatment process were studied. The results show that with the increase of the mass fraction of PTMG, the water absorption and moisture absorption rate of polyether ester can reach 4.10% and 1.62% respectively, the contact angle can reach 63.81°, and the crimping performance of the composite fiber is also significantly improved, reaching a crimp ratio of 48%. Heat treatment can further improve the crimp properties of composite fibers and the effect of wet heat treatment is shown to be better than that of dry heat treatment. After wet heat treatment, the crimp ratio and crimp recovery of the composite fibers reach 70% and 55%, respectively. PTMG can also improve the normal pressure dye uptake rate of composite fibers, which reaches as high as 93.25%, and is 12% higher than that of PBT/PET parallel composite fibers.