PTT/PET自卷曲长丝的拉伸和弹性回复性能  

Stretching and Elastic Recovery of PTT/PET Self-crimping Filament

作　　者：王慷[1] 罗锦[1] 徐广标[1] 王府梅[1] 

机构地区：[1]东华大学纺织学院,上海201620

出　　处：《合成纤维》2009年第5期15-19,共5页Synthetic Fiber in China

摘　　要：对相同细度的3种聚对苯二甲酸丙二醇酯(PTT)/聚对苯二甲酸乙二醇酯(PET)自卷曲长丝进行拉伸性能和定伸长回复性能测试。测试结果表明:PTT/PET自卷曲长丝拉伸曲线具有典型的两个阶段和两个屈服点的特征,预加张力的大小对于伸长率的测试结果影响很大;卷曲伸长对该类长丝较高的伸长率有较大贡献,经过湿热处理后的长丝卷曲伸长和断裂伸长明显增加,但是不同的PTT/PET自卷曲长丝的伸长能力有一定差异;PTT/PET自卷曲长丝的弹性回复性能低于纯PTT长丝,而高于PET长丝,弹性回复性主要来源于具有优异弹性回复性的PTT大分子链结构;热处理的PTT/PET长丝在高定伸长率下有着较好的弹性回复性,在定长为30%时的弹性回复率接近100%。Stretching and elastic recovery properties based on elongation of three kinds of PTT （Polytrimethylene terephthalate）/PET （Polyethylene terephthalate） self-crimping filaments with same linear density were tested. The testing results showed that there were typical two steps and two yield points in the force-elongation curve of PTT/PET filaments. It was noted that the pretension used in the testing greatly influenced the value of elongation of these filaments. The crimp elongation enormously contributed to the high elongation of PTT/PET filament, especially for the wet-heat treated filaments. Both the crimp and breaking elongations of the treated filaments rose significantly, however, the elongation abilities were different among the three filaments. The elastic recovery of original PTT/PET, which resulted from helical conformation of PTT molecular chain, laid between in that of pure PTT and pure PET filaments. Relative to original filaments, the wet-heat treated filaments owned much excellent elastic recovery based on elongation, which was as high as 100 % in 30 % elongation and arose from the helical crimp configuration.

关 键 词：FFF/PET自卷曲长丝 卷曲仲长 拉伸曲线 预加张力 弹性回复率 

分 类 号：TQ342.95[化学工程—化纤工业]