林业工程学报2016，Vol.1Issue(5)：58-64,7.DOI:10.13360/j.issn.2096-1359.2016.05.011
纤维素在四己基醋酸铵／助溶剂混合体系中的溶解及再生
Dissolution and regeneration of cellulose in tetrahexylammonium acetate/co-solvent system
摘要
Abstract
Cellulose is the most abundant renewable resource in nature. It is insoluble in most organic solvents due to the rich hydroxyl groups in its structure which can form strong, three⁃dimensional inter⁃and intra⁃molecular hydrogen bond⁃ing network. It is highly interest to develop effective cellulose dissolution system to broaden the applications of cellulose. Ionic liquids ( ILs) have received increasing attention due to their excellent dissolving abilities, low toxicity, and negli⁃gible vapour pressure compared to traditional cellulose solvents. Tetrahexylammonium acetate ( THAA) was synthesized by ion exchange reaction. Dimethyl sulfoxide( DMSO) , dimethylacetamide( DMAc) and dimethylformamide( DMF) were chosen as the co⁃solvent for THAA used in cellulose dissolution. The effect of co⁃solvent type, weight percentage of THAA in THAA/DMSO mixed solvent (wTHAA), dissolution temperature and the degree of polymerization (DP) of the cellulose materials on the cellulose dissolution efficiency of the mixed solvent were studied. The results showed that DMSO was an excellent co⁃solvent for cellulose dissolution with THAA while DMAc,DMF showed poor abilities as the co⁃solvent for cellulose dissolution. The THAA/DMSO mixed solvent with wTHAA=30% possessed the highest cellulose solubility, in which 7.51% microcrystalline cellulose can be completed dissolved under 25℃. In addition, high dissolu⁃tion temperature and low DP of cellulosic materials increased the dissolution rate of the process. Dissolved cellulose was regenerated by adding deionized water to the cellulose/THAA/DMSO solution. The XRD result showed that the regenera⁃ted cellulose changed from cellulose Ⅰ to cellulose Ⅱ.关键词
纤维素/离子液体/助溶剂/溶解/再生Key words
cellulose/ionic liquid/co-solvent/dissolution/regeneration分类
化学化工引用本文复制引用
忻萍萍,史浩婷,牛逊,潘晖..纤维素在四己基醋酸铵／助溶剂混合体系中的溶解及再生[J].林业工程学报,2016,1(5):58-64,7.基金项目
国家林业公益性行业科研专项（201504602）；江苏高校品牌专业建设工程资助项目（TAPP）。 （）
