Abstract
The polymer rheology is essential for plastic manufacturing. In order to master the rheological characteristics of polymethyl methacrylate (PMMA) a viscoelastic model of PTT is employed to describe its rheological behaviors in 1-D channel flow. The corresponding governing equations are established based on isothermal impressible fluid. Then construct a numerical method to calculate the viscosity change with shear rates so as to explore the influences of the nonlinear parameter and relaxation time spectrum. The rheological experiments were carried out with three PMMA brands in a capillary rheometer to measure the viscosity at different shear rate. The experimental results show the Newtonian region appears within the scope [0, 2.1] for shear rate, and the constitutive equation can correct describe the rheological characteristics if the parameters are set properly.
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