Study on the Rheological Properties of Propellant Substitute During Plasticization Process

In order to investigate the rheological properties of the propellant substitute during the plasticization process of propellant, and provide a basis for process stability and mold design, a capillary rheometer was used to study the rheological properties of the mixture in the plasticization process of the propellant substitute at different solvent ratios and temperatures. Regression analysis was conducted to determine the non-Newtonian index ( \(n\) ) and viscosity flow activation energy ( \({\Delta E}_{\eta }\) ) of the substitute. The experimental results demonstrate that the propellant substitute exhibits typical pseudoplastic fluid behavior. Within the range of experimental conditions, an increase in shear rate leads to a decrease in apparent viscosity of the substitute, which conforms to the Ostwald-de Wale power-law model. Moreover, with increasing temperature and solvent ratio, the apparent viscosity of the substitute decreases, accompanied by an increase in the value of n, indicating a reduction in non-Newtonian behavior.