凝固浴温度对超高相对分子质量聚酰胺6冻胶纺纤维结构和性能的影响

Influence of Coagulation Bath Temperature on Structure and Properties of UHMW PA6 Fiber Prepared by Gel Spinning

以氯化钙为络合剂，采用冻胶纺丝技术制备超高相对分子质量（UHMW）聚酰胺（PA）6纤维，重点研究凝固浴温度对UHMWPA6冻胶纺纤维结构和性能的影响，以期获得高强高模PA6纤维。试验结果表明：在较低凝固浴温度（4～8℃）下得到的纤维表面较为光滑；凝固浴温度越低，分子间排列越规整，取向度越好，成品丝条的双折射率越高，越易形成a晶型，结晶度越高，所得纤维的强度和模量也较大。综合考虑力学性能测试结果和室温的影响，凝固浴温度选为8℃。

In order to get high strength and high modulus PA6 fibers,by using CaC12 as complexing agent,the ultra-high molecular weight PA6 fiber（UHMW PA6）was prepared by gel spinning techno- logy,and the effect of coagulation bath temperature on the structure and properties of UHMW PA6 fi- ber was studied. The experimental results showed that, when the coagulation bath temperature was low,the PA6 molecules were in better orientation,the birefringence of fiber was higher, the content of a-crystal was higher,and the strength and modulus of fiber were better. It was found that the surface of the fiber was smooth when the coagulation bath temperature was in the temperature range of 4-8 ℃. In order to achieve high mechanical properties of fiber and minimize the influence of ambient room temperature on the process,the optimum coagulation bath temperature was 8 ℃.