聚醚酯/聚对苯二甲酸丁二醇酯并列复合纤维的制备及其性能

Properties of polyether-ester/polybutylene terephthalate composite fibers prepared by side by side bicomponent melt spinning

为得到弹性优良、手感柔软的复合纤维,采用热塑性弹性体聚醚酯(TPEE)与聚对苯二甲酸丁二醇酯(PBT)进行并列复合纺丝,研究了双组分熔体的流变性能、组分配比对并列复合纤维成形稳定性的影响,并分析了复合纤维卷曲形成的机制。结果表明:TPEE组分的加入可降低复合纤维的弹性模量,增加复合纤维的柔软性,但不利于复合纤维断裂强度的提高;当TPEE与PBT的体积比为5∶5时,复合纤维的断裂强度为1.4 cN/dtex,弹性模量为13 cN/dtex,卷曲率高达80%;复合纤维中TPEE组分的热收缩性远高于PBT组分,致使TPEE组分在收缩过程中易受PBT组分的阻碍,形成了TPEE/PBT并列复合纤维的卷曲机制。

In order to fabricate the composite fibers with excellent elastic and soft touch,the polyether-ester(TPEE)and polybutylene terephthalate(PBT)were used to fabricate the side by side bicomponent fibers.The effect of the rheological behavior and composition ratio of the TPEE and PBT component on the spinnability was studied.Meanwhile,the mechanism of crimp formation within the composite fibers was analyzed.The results show that the addition of TPEE can reduce the elastic modulus of the composite fiber,and which is contribute to the flexibility of the composite fibers,but it is unfavorable for the improvement to the breaking strength of the fibers.When the volume ratio of TPEE and PBT component is 5∶5,the breaking strength and elastic modulus of the composite fibers is 1.4 and 13 cN/dtex,respectively,and the curl ratio is as high as 80%.The crimp mechanism of TPEE/PBT composite fibers can be explained that the thermal shrinkage of TPEE component is much lager than that of PBT component,so that the shrinkage of TPEE component is easily hindered by the PBT component during the fiber forming process and the crimp forms.