改变纺程参数制取高模量低收缩PET纤维

介绍在高速熔融纺丝线经过的空气介质中设置液体等温槽以改变纺程参数，制取高性能聚对苯二甲酸乙二醇酯（ＰＥＴ）纤维的一种新工艺，制得的初生纤维具有优异的力学性能。分析了此法制得的纤维的结构和力学性能的变化以及工艺条件的影响，指出其性能的提高是由纤维结构中取向非晶态含量大大增加所引起。对制得的初生纤维进一步拉伸热处理后，其性能优于一般高模量低收缩ＰＥＴ纤维。

HIGH MODULUS LOW SHRINKAGE PET FIBER PREPARED WITH THREADLINE MODIFICATION PROCESS

A new process of preparing high performance PET fiber was introduced. The melt spinning process of PET fiber at high speed was modified through the introduction of a liquid isothermal bath(LIB) in the spinline. With this modification, as spun fiber with high performance can be obtained by one step process. The structure and mechanical properties of the as spun fibers were characterized. Experimental results showed that the improvement of mechanical properties is caused primarily by the increasing content of oriented noncrystalline phase. With the further hot drawing, the properties of PET fiber are superior to those of the normal HMLS fiber.