张力对PET／PTT长丝结构和性能的影响

Impact of tension on the structure and properties of PET/PTT filaments

讨论外加张力对PET/PTT双组分长丝结构、卷曲状态和力学性能的影响。随着张力的增加,PET/PTT双组分长丝的声速取向因子增加、初始模量增加;卷曲伸长率和收缩率呈一阶指数的形式下降。完全松弛条件下的热湿处理可使PET/PTT双组分长丝得到显著的卷曲,但拉伸初始模量大大降低,适当的小张力有利于兼顾长丝模量和卷曲弹性。

The paper discusses the properties and structure of the PET/PTT filaments under various tension conditions. As the tension increases, the sonic orientation factor of PET/PTT fiber increases and the Yang＇s modulus also increases; the crimp shrinkage rate and the curve elongation rate of PET/PTT fiber decrease exponentially. Moisture thermal treatment of PET/PTT filament under fully relaxed state can impart it the most prominent crimp, but the Yang＇s modulus of the fiber will decrease significantly; appropriate small tension is beneficial for both the crimp and the Yang＇s modulus.