[AMIM]Cl为溶剂的纤维素溶液的流变性能

Rheological behavior of cellulose solution with [AMIM]Cl as solvent

以离子液体氯化1-烯丙基-3-甲基咪唑([AMIM]Cl)为纤维素溶剂,制备3种不同质量分数的纤维素溶液,测定纤维素溶液在不同条件下的静态及动态流变性能,分析实验数据,计算溶液的黏流活化能Eη及结构黏度指数Δη。静态流变结果表明,实验范围内的纤维素溶液均为假塑性流体,表观黏度、剪切应力、结构黏度指数均随温度升高而下降,当温度达到100℃,溶液表观黏度趋于恒定。动态流变结果表明:该体系的损耗模量和储能模量随溶液质量分数的增加而增大,随温度的升高而减小;损耗模量和储能模量的曲线都有1个交点,交点前黏性效应占优,交点后弹性效应占优。

The ionic liquid of 1-allyl-3-methylimidazolium chloride（[AMIM]Cl） was used as solvent to dissolve cellulose,and three kinds of cellulose solutions with different mass concentrations were prepared.Static and dynamic rheological properties of cellulose /[AMIM]Cl solutions were investigated at different test conditions.The experimental data were analyzed,and viscose fluid activation energy and the structural viscosity index of the solutions were calculated.The results of static rheological properties show that cellulose ionic liquid solutions are pseudoplastic liquids in the studied range.Apparent shear viscosity,shear stress and structural viscosity index all decrease with temperature increase,and apparent shear viscosity is tend to be a constant value when temperature is up to 100 ℃.The results of dynamic rheological properties show that the loss modulus and storage modulus of this system increased with the increasing of solution concentration,decreased with the increasing of temperature.The curves of loss modulus and storage modulus have a crossing point,before it,viscosity is dominant,and after it,elasticity is dominant.