Abstract: In order to study on the molding process of cellulose diacetate fibers, we used Physica MCR101 rheoviscometer to investigate the relationship between concentrations and temperatures of spinning dope and shear rates, and thus the flowing curves of 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 structure viscosity index decreased, and non-newtonian index increased while elevating the dope temperatures. And as the dope concentrations increased, the apparent viscosity and structure viscosity index increased, non-newtonian index and flow activation energy reduced.

Key words: cellulose diacetate, rheological property, apparent viscosity, non-newtonian index, structural viscosity index, flow activation energy