中文摘要：

为研究二醋酸纤维素纤维纺丝成形工艺，采用PhysicaMCR101流变仪测试二醋酸纤维素纤维纺丝溶液的质量分数、温度与剪切速率之间的变化关系，得到纺丝溶液的流动曲线。在此基础上，模拟分析出纺丝溶液的非牛顿指数、结构黏度指数和黏流活化能等流变参数。结果表明：二醋酸纤维素纤维纺丝溶液为切力变稀非牛顿流体，随着溶液温度的升高，溶液的表观黏度和结构黏度指数减小，非牛顿指数增加；随着溶液质量分数的增加，溶液的表观黏度和结构黏度指数呈现增大趋势，而非牛顿指数和黏流活化能逐渐减小。

英文摘要：

In order to study the molding process of cellulose diaeetate fibers, Physica MCRIO1 rheoviscometer was used to investigate the relationship between mass concentrations, temperatures, and shear rates of spinning dope, and thus the flow curves of the spinning dope were acquired. The rheological parameters including non-newtonian index, structural viscosity and flow activation energy were obtained by simulative analysis from the curves. The results demonstrated that the spinning dope of cellulose diacetate was a typical non-newtonian fluid. The apparent viscosity and structural viscosity indexes decreased and non-newtonian index reduced while the dope temperatures rised. And as the dope mass concentrations increased, the apparent viscosity and structural viscosity indexes increased, but non- newtonian index and flow activation energy reduced.