天然彩色棉纤维在1-丁基-3-甲基咪唑氯盐离子液体中的溶胀与溶解

为避免使用非生态染料和助剂对人体造成伤害，利用热台偏光显微镜研究天然彩色棉纤维在BMIM]Cl（1-丁基-3-甲基咪唑氯盐）离子液体中的溶胀与溶解性能。比较不同预处理方式、温度和时间对纤维溶胀和溶解性能的影响。结果发现天然彩色棉纤维在BMIM]Cl溶剂中均产生横向的不匀性溶胀继而溶解，但溶解性能存在差异。棕棉和绿棉纤维比白棉纤维更易溶解。碱处理和酶处理提高了纤维溶胀速率和溶胀尺寸，酶处理后纤维在BMIM]Cl溶液中变为均匀溶胀。棕棉在溶解过程中色素物质分布相对稳定，绿棉纤维色素物质随纤维溶解而向外扩散。温度对棉纤维的溶胀有很大影响。随着温度升高，棉纤维的溶胀度增大，达到最大的溶胀尺寸时间缩短。

Swelling and dissolution of naturally colored cotton in ionic liquids

In order to avoid the harmful influence on human health by nonecological dyes and additives, the swelling and dissolution behavior of naturally colored cotton in BMIM]Cl (1-butyl-3-methylimidazolium chloride) were investigated by optical methods. The effects of reaction temperature, reaction time, and pretreatment were studied. The results showed that brown cotton, green cotton and white cotton all balloon swollen followed by completely dissolving in BMIM]Cl ionic liquids, but their solubility was different. The pigment substance of green cotton spread out from the fiber lumen during the balloon swelling and dissolution while the pigment of brown cotton did not. Both the alkaline and enzymatic pretreatment can increase the swelling ratio of the fiber. But the ballooning phenomenon of cotton fiber disappeared after the enzymatic pretreatment. The time required to reach maximum swelling decreased and the fiber diameter at maximum swelling increased with the increasing of ionic liquid temperature.