N-甲基吗啉-N-氧化物处理苎麻纤维工艺的优化

为提高N-甲基吗啉-N-氧化物（NMMO）对苎麻纤维的处理效果，利用正交试验方法优化了其处理工艺，通过测试处理后纤维性能得出：温度为65 ℃、NMMO 质量分数为 30%、处理时间为 20 min 时苎麻纤维的综合性能达到最佳；处理后纤维中既无 NMMO 分子残留，也没有生成新的纤维素；最佳工艺条件下，苎麻纤维的断裂强度和结晶度分别下降了23.84%和21.08%，线密度、断裂伸长率和断裂回转数分别增加了11.05%、41.36%和57.53%，苎麻纤维的综合性能较未处理时有较大提升。

Optimizing of process for treating ramie fibers by N-methylmorpholine-N-oxide

In order to improve the properties of ramie fibers treated by N-methyllmorpholine-N-oxide (NMMO), an orthogonal experiment was designed for theoptimization of thetreatment peocess.By testing the properties of ramie fibers after treatment, it was found that under conditions of temperature of 65 ℃, concentration of NMMO solution 30% and treatment time of 20 min, the ramie fibers had optimum comprehensive properties. It was confirmed that no NMMO residue existed and no new types of cellulose generated on the treated jibers. Under the optimum conditions of the process, the breaking tenacity and crystallinity of the ramie fibers decreased by 23.84% and 21.08% while the linear density, breaking elongation and breaking rotation number of the ramie fibers increased by 11.05%, 41.36% and 57.53% , respectively. The comprehensive properties of the ramie fibers had a great improvement compared with those untreated.