摘要
本文研究了9％LICI／DMAC纤维素溶液的流变性能。在该体系中纤维素溶液是非牛顿流体，属于假塑性流体，具有典型的幂律性。通过幂律方程拟合计算，其稠度系数为60～135，流动特性指数为0.62～0．70。随着浓度增大，稠度系数增大和流动特性指数降低；温度的变化对流动特性指数的影响不大，温度升高，流动特性指数略有减小，而稠度系数相对增大。溶液的粘度随着剪切速率的增大，开始时粘度迅速降低，后趋于稳定，这可能与纤维素分子在溶液中的取向有关。在不同剪切速率下，其流动活化能为23～30kJ．
The rheological behavior of unmodified cellulose solution in LiC1/DMAc was studies by rotational viscometer,the solution is none-Newtonian. The none-Newtonian flow index(n ) is about 0. 62~0. 70 and the structural viscosity index (m) has a value of 60~135. The relations between n,m and temperature,concentration were discussed respectively. under different shear rate, the apparent viscosity now activation energy (Er) was calculated with a value of 23~30kJ.
出处
《纤维素科学与技术》
CAS
CSCD
1996年第4期32-37,共6页
Journal of Cellulose Science and Technology
关键词
纤维素
溶剂
流变性能
氯化锂
cellulose,LiC1/DMAc solvent, rheological behavior
