Rheological property of cellulose diacetate spinning dope

In order to study the molding process of cellulose diacetate fibers,Physica MCR101 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.