RHEOLOGY AND CONSTITUTIVE EQUATIONS FOR ABS POLYMER MELTS

摘要

Rheological data for start-up of steady shear and uniaxial elongational viscosity as well as stress relaxation data after both deformations for commercial grade ABS polymer melts are presented. One differential and two integral constitutive models were fit to the data. Phan-Thien and Tanner differential model resulted in the best overall fit. Inability of tested models to accurately predict stress relaxation in nonlinear regime is discussed.