State Key Lab for Modification of Chemical Fibers and Polymer Materials, College of Material Science & engineering, Donghua University, Shanghai 201620, PR China.
Carbohydr Polym. 2013 Sep 12;97(2):300-5. doi: 10.1016/j.carbpol.2013.04.080. Epub 2013 May 3.
A binary ionic liquid system was confirmed to be a promising solvent to dissolve chitosan, and the regenerated chitosan fibers were prepared by wet and dry-wet spinning technique respectively. The SEM results show that the chitosan fibers prepared by wet spinning technique present striated surface and round cross section, and the chitosan fibers prepared by dry-wet spinning technique present smooth surface and irregular cross section. The mechanical testing results show that the regenerated chitosan fibers present relatively high tenacity, especially, these prepared by dry-wet spinning process present excellent strength and initial modulus, i.e. 2.1cN/dtex and 83.5cN/dtex, which is stronger than that of most reported chitosan fibers. The FT-IR results show that the dissolution of chitosan in the binary ionic liquid system is due to the protonation of NH₂ groups in the chitosan chains. Furthermore, a possible reaction during the dissolution and regeneration process is proposed.
二元离子液体体系被证实是一种有前途的溶解壳聚糖的溶剂，通过湿法纺丝和干湿纺丝技术分别制备了再生壳聚糖纤维。SEM 结果表明，湿法纺丝技术制备的壳聚糖纤维呈现出条纹状表面和圆形横截面，而干湿纺丝技术制备的壳聚糖纤维呈现出光滑表面和不规则横截面。力学性能测试结果表明，再生壳聚糖纤维具有较高的强度，特别是通过干湿纺丝工艺制备的纤维具有优异的强度和初始模量，分别为 2.1cN/dtex 和 83.5cN/dtex，比大多数报道的壳聚糖纤维都要强。FT-IR 结果表明，壳聚糖在二元离子液体体系中的溶解是由于壳聚糖链上的 NH₂ 基团的质子化。此外，还提出了溶解和再生过程中的一个可能的反应。
