Dissolution and degradation behaviours of cellulose with 1-N-butyl-3-methylimidazolium chloride as solvent
In this paper, the preparation of the solutions was arranged starting from slurry of cellulose in the ionic liquid of 1-N-Butyl-3-methylimidazolium chloride (BMIMCl) by a special vertical kneader system at vacuum and high shearing rates. Torque moment and revolutions per minute (rpm) of vertical kneading were determined on-line. The cellulose solutions in ionic liquids were also characterised by means of polarizing microscope and cone-plate rheometer. The relationship of dissolution degree and torque moment was established. Several factors which affect the velocity of dissolution process including cellulose concentration and temperature of the solutions were discussed respectively. The dissolution rate was increased remarkably and the uniform solution could be obtained compared to the static dissolution method. The Cuen-degrees of polymerization (DPCuen) of the precipitated celluloses were determined. The influence of dissolution condition on cellulose degradation was studied according to the variation of DPs. It was found that the degradation occurred simultaneously in the dissolution process, however, the degradation degree could be controlled by the dissolution dynamic conditions.
ZHU Tianxiang ZHU Fangliang ZHANG Yumei WANG Huaping
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University,S State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University,
国际会议
2009 International Conference on Advanced Fibers and Polymer Materials(2009年先进纤维与聚合物材料国际学术会议)
上海
英文
84-86
2009-10-21（万方平台首次上网日期，不代表论文的发表时间）