Abstract:

The activation energy of softwood pulp with a higher degree of polymerization（DP=1460）in 1-butyl-3-methylimidazolium chloride（[BMIM]Cl）solvent was studied，and the effects of such factors as temperature，cellulose concentration，additives of mesoporous silica on the apparent viscosity were discussed. The investigations suggested that the activation energy of cellulose/ [BMIM]Cl system was 50.8 kJ/mol，and the concentration of cellulose had an obvious effect on the apparent viscosity of cellulose/ [BMIM]Cl system. The cellulose-based films prepared at 363.0—368.0 K had better mechanical properties. The addition of mesoporous silica SBA-15 increased the viscosity of cellulose/ [BMIM]Cl system，with a maximum at the addition of 1.5% SBA-15.

摘要：

以1-丁基3-甲基咪唑氯盐（[BMIM]Cl）离子液体为溶剂，研究了高聚合度的针叶木浆（DP=1460）在[BMIM]Cl溶剂体系中的活化能，考察了溶解温度、浆粕浓度和介孔硅添加量对纤维素/[BMIM]Cl体系表观黏度的影响。研究表明：纤维素/[BMIM]Cl 体系黏流活化能ΔE=50.8 kJ/mol，针叶浆粕含量对体系表观黏度影响显著，当纤维素溶解温度为363.0～368.0 K时制备的纤维素膜有较好的力学性能；纤维素/[BMIM]Cl体系表观黏度随着SBA-15介孔硅含量增加呈现先增加后降低的趋势，当介孔添加量为1.5%时，体系的表观黏度达最大值。