热定型对UHMWPA6纤维结构和性能的影响

Effect of annealing treatment on structure and properties of UHMWPA6 fiber

以自制的相对粘度19.44的超高相对分子质量聚己内酰胺(UHMWPA6))为原料,以甲酸为溶剂、氯化钙为络合剂通过局部络合得到纺丝液,经干法纺丝制备了UHMWPA6纤维;探讨了不同热定型条件对纤维结构及性能的影响。结果表明:随着热定型时间的增加,UHMWPA6纤维的断裂强度、模量、断裂伸长率、取向度均降低,而晶体中α晶体含量增加,γ晶体含量减小;适当高温和短时间的热定型有利于纤维力学性能的提高,180℃下热定型处理后的纤维力学性能较好。

Using the self-made ultrahigh-relative molecular mass polycaprolactam （UHMWPA6） with the relative viscosity of 19.44 as raw material, formic acid as a solvent and calcium chloride as a complexing agent, the spinning dope was prepared by partially complexation and spun into UHMWPA6 fiber by dry spinning process. The effects of the annealing conditions on the structure and properties of UHMWPA6 fiber were discussed. The results showed that the breaking strength, modulus, elongation at break and orientation degree of the UHMWPA6 fiber decreased, the α -crystal content increased and the γ -crystal content decreased while prolonging the annealing time. Appropriately high annealing temperature and low annealing time was beneficial to improving the mechanical properties of the obtained fiber. The obtained fiber exhibited fairly good mechanical properties after annealing at 180 ℃.