Preparation and stability of cellulose LiCl /DMAc solution

The preparation process and stability of cellulose LiCl /DMAc solution were studied.The experimental results showed that the cellulose subjected to activating treatment was added to the LiCl / DMAc solvent system which was formed by dissolving LiCl into DMAc,and the resultant solution was stirred for certain period of time at 100 ℃,then cooled down to room temperature,and stirring continnued for several hours,and so doing the uniform and transparent cellulose LiCl /DMAc solution was obtained.It was also found that the greater the mass concentration of cellulose,the longer the time required for stirring both at high and room temperature.Similarly,the greater the polymerization degree of cellulose,the more difficult the cellulose to dissolve.When LiCl contains crystal water,the cellulose only swells but insoluble.Only when the mass concentration of LiCl exceeds 6% can the cellulose be dissolved completely.In addition,the viscosity of cellulose LiCl /DMAc solution at different temperatures varying with time is tested,and it is shown that the solution is very stable within 30 days at the temperature lower than 50 ℃,but remains stable only 15 hours when heated to 100 ℃.