Department of Chemistry, Isfahan University of Technology, Isfahan, 8415683111, Iran.
Department of Chemistry, Isfahan University of Technology, Isfahan, 8415683111, Iran; Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71467-13565, Iran.
Carbohydr Polym. 2018 Sep 1;195:413-419. doi: 10.1016/j.carbpol.2018.04.123. Epub 2018 May 1.
An acidic ionic liquid (IL), i.e. 1-(carboxymethyl)pyridinium chloride, is synthesized and investigated for its untapped potential to dissolve cellulose, chitosan and chitin with concentrations of up to 11, 10 and 5 wt.%, respectively. Interestingly, the optimum water content of the IL/water towards efficient dissolution is determined to be as high as 40 wt.%, which is in evident contrast to the previous reports for other ILs by which the dissolution of polysaccharides is achieved at the expense of water content. Using high water content in IL/water mixture makes a breakthrough in ease of solution processability and dissolution cost reduction. Regenerated cellulose and chitosan have less crystallinity and lower temperature of thermal degradation onset (T) compared to the initial samples. The regenerated cellulose exhibits reduction in degree of polymerization, crystallinity and T by 55.1%, 11.0% and 38.2%, respectively. Chitin in addition to dissolution, is also hydrolyzed to quaternary ammonium chitosan.
一种酸性离子液体（IL），即 1-（羧甲基）吡啶氯化物，被合成并研究其潜在用途，以将纤维素、壳聚糖和壳聚糖分别溶解在高达 11、10 和 5wt.%的浓度下。有趣的是，确定 IL/水混合物中实现有效溶解的最佳含水量高达 40wt.%，这与以前报道的其他 IL 形成鲜明对比，以前的 IL 通过消耗含水量来实现多糖的溶解。在 IL/水混合物中使用高含水量在易于溶液加工和降低溶解成本方面取得了突破。与初始样品相比，再生纤维素和壳聚糖的结晶度和热降解起始温度（T）较低。再生纤维素的聚合度、结晶度和 T 分别降低了 55.1%、11.0%和 38.2%。壳聚糖除了溶解之外，还被水解为季铵化壳聚糖。
