并列型PTT/PET复合纤维的卷缩特性及力学性能的研究

研究了不同线密度PTT/PET复合纤维经过热湿处理前后的形态结构,卷缩特性,卷曲回弹性和拉伸性能变化。结果显示:经过热水热处理后,纤维的卷曲半径明显减小,半径收缩率增大;温度越高,纤维卷曲半径越小,半径收缩率越大。纤维的卷曲收缩率和卷曲模量随着线密度的增加而减小,卷曲稳定度随线密度增加有最大值。纤维的弹性恢复率随线密度的增大而增大,纤维的紧缩伸长率在167 dtex附近有最大值。复合纤维的初始模量随线密度的增加而减小,热处理后的初始模量变小;断裂伸长率随线密度的增加而增大,经热处理后数值增大;断裂强度在热处理前后与线密度关系不大,热处理后断裂强度略有减小。

The unbalanced characteristics and mechanical properties of side-by-side PTT/PET composite fiber

This essy discusses the morphological structure, unbalanced characteristics, curly recovery and tensile properties change of different linear density IYIT/PET composite fiber before and after hot wet process. Results indi- cates that fiber curly radius evidently decreases and radius shrinkage rate increases after the heat treatment by hot water; the higher the temperature is, the smaller the fiber curly radius is, the greater the radius shrinkage rate is. The fiber curly shrinkage and curly modulus decreases with the increase of linear density, and curly stability will reach the maximum with linear density increasing. Elastic recovery rate of fiber increases with the increase of linear density,and tightening elongation has the maximum nearby 167 dtex. Composite fiber＇s initial modulus decreases with linear density increasing, and also decreases after heat treatment; elongation at break increases with the in- crease of linear density,and increases after heat treatment ;breaking strength doesnt have obvious relationship with linear density pre-and post-heat treatment,having a little decrease.