涤纶短纤维在纺程中的取向与性能研究

应用ＷＡＸＤ法、声速法、双折射法等研究了涤纶在纺丝与后加工过程中取向的形成变化及和性能的关系，以及工艺条件对纤维结构和性能的影响。结果表明，纤维非晶区取向和结晶度与纤维的刚性和柔韧性密切相关，但决定纤维力学性能的主要的结构因素是纤维的非晶区有序化程度的高低。一次拉伸主要是非晶区链段沿张力方向进行有序排列的过程，伴随生成大量晶核，导致应变结晶；热定型时结晶产生于高度取向的非晶区域，是应变结晶（取向诱导结晶）和热结晶共同作用的结果；高温机械卷曲是在机械挤压条件下的热力学控制的非晶区解取向过程

STUDY ON THE ORIENTATION AND PROPERTY OF PET FIBER DURING SPINNING PROCESS

We discussed the relation between orientation and property, the effect of process parameter on the structure and property of fiber during spinning process by WAXD, sonic velocity method and double refraction method. The results indicate that the amrophous orientation and crystalinity related to the stiffness and flexibility, but main structure factor that decided the mechanical properties of fiber was the amrophous orientation. The amorphous segment made ordering along tension direction and crystal nucleus grew at the same time in the first drawing, that created strain crystallization. Crystallization produced in amorphouss region of height ordering during heat setting, it was the result that strain crystallization and thermal crystallization acted. High temperature mechanical crimp was the course of amorphous region disorientation under thermodynamics command.