【摘要】 在纤维素/NMM O.H2O溶解纺丝体系中,氯化铵改性得到的Lyoce ll纤维的结晶结构为纤维素Ⅱ和Ⅲ的混合结晶结构;在相同的纺丝条件下,少量氯化铵存在可以明显改善Lyoce ll纤维的力学性能,对于平均聚合度为818的棉浆纺丝液(纤维素质量分数为9%),加入0.5%的氯化铵(以纺丝液质量为基准)时,得到的Lyoce ll纤维拉伸强度比未加氯化铵时提高约30%。通过研究氯化铵对最终Lyoce ll纤维结构与性能的影响,提出了氯化铵改善Lyoce ll纤维力学性能的机理模型。更多还原

【Abstract】 A mechanism why ammonium chloride can improve the mechanical properties of Lyocell fibers has been studied. The effects of ammonium chloride, which is used as a modifier, on the structure and properties of Lyocell fibers which are prepared by cellulose/NMMO·H₂O spinning system were investigated. The results show that the effect of draw ratio on the structure and mechanical properties of Lyocell fibers modified by NH₄Cl is different from those of common Lyocell. The crystal form of this Lyocell is a mixture of cellulose Ⅱ and Ⅲ. It is found it can remarkably improve the mechanical properties for adding amount of NH₄Cl into system. For the cotton cellulose/NMMO·H₂O solution （cellulose mass percentage 9%, （DP） 818）, the tenacity of Lyocell can increase 30% when adding （0.5%） NH₄Cl into the system.更多还原