Lyocell纤维的原纤化控制及纤维结构的变化

Lyocell纤维的去原纤化和防原纤化加工技术是印染加工的要点。本文研究了不同碱处理方式和不同碱浓度处理对Lyocell纤维的去原纤化效果，用乙烯基单体来达到防原纤化的效果，并用烧毛评级法来表征纤维的原纤化等级。在实验结果的基础上，提出了碱处理纤维准晶区发生了准晶体解体和晶体再生长的理论假设，并从理论上分析了碱处理纤维聚集态结构的改变。解释了碱处理去原纤化及乙烯基单体接枝防原纤化的原因。结果表明，碱处理过程中纤维表面微小纤维发生了溶解，碱处理使纤维的聚集态结构发生了变化，但随着碱处理浓度增加，002峰的半高宽减小，晶粒的尺寸增大，降低了晶体取向指数。经乙烯基单体接枝的纤维表面结构发生了变化，纤维结晶度下降。

Fibrillation Control and Structure Change of Lyocell Fibers

The key technology of dyeing and printing of Lyocell fibers is defibrillation and antifibrillation. This paper studies thedefibrillation effects of Lyocel fibers treated with different alkali concentrations and different antifibrillation methods. The antifibrillationof Lyocell fibers is treated with vinyl monomer and the degree of fibrillation is estimated by singeing grade. Based on results ofexperiment, it proposes the hypothesis of quasi-crystal disassociation and recrystallization in the quasi-crystal phase, analyzes thechanges of aggregating state structure of the fibers after alkali treatment and explains the causes of alkali treatment for defibrillationand vinyl grafting for antifibrillation. The results show that the fuzz on the surface of the fibers is dissolved during alkali treatmentand the structure of aggregating state changes. While the half-width of 002 diffraction peak decreases and the crystallite sizeincreases with the increase of alkali concentration. The surface structure of Lyocell fibers being graft modified has changed and thecrystalline grade decreased.