LiCl改性聚酰胺6纤维的制备与性能

通过高速共混包覆法和熔融纺丝法制备出聚酰胺6(PA6)-LiCl共混复合纤维,研究了不同含量的LiCl对PA6纤维的结构和性能的影响。差示扫描量热分析、傅里叶变换红外光谱分析、热重分析、纤度及力学性能测试等的结果表明:LiCl中Li+能打开PA6的氢键,并与酰胺基团产生比氢键作用力更强的络合作用,降低了PA6分子链的规整性,从而有利于纤维的热牵伸,在降低纤度的同时提高力学性能。当LiCl质量分数为0.5%时,PA6-LiCl共混纤维的可拉伸倍数最高可至4.8倍,断裂强度为5.3 cN/dtex,断裂伸长率为5.8%,较未加LiCl的样品的断裂强度提高了112%,断裂伸长率降低了74.6%,综合力学性能最佳。

Preparation and Performance of LiC1 Modified Polyamide 6 Fiber

The polyamide（PA）6-LiC1 composite fibers were prepared by high-speed blending coated method and then melt spinning. The effects of LiC1 with different contents on the structure and properties of PA6 were studied. The experimental results of DSC, TG, FTIR and mechanical properties test showed that complexation was formed between Li＋ and PA6, the original hydrogen bond of PA6 was destroyed, consequently the irregularity of molecular chains of PA6 was reduced, which benefited the drawing and improved fiber mechanical properties. When the mass fraction of LiC1 was 0.5 %, the draw ratio went up to 4.8 times, breaking strength was 5.3 cN/dtex, elongation at break was 5.8 %. Compared to the pure PA6 fiber, breaking strength increased by 112 %, elongation at break decreased by 74.6 %, the mechnical properties of PA6-LiC1 composite fiber were optimum.