Measurement of the first and second normal stress differences in a polystyrene melt with a cone and partitioned plate tool

Abstract

Abstract.: Step shear rate experiments in the range of $$0.1 10s^{ - 1}$$ the steady state value of -N2/N1 becomes larger if smaller cone angles are used. Data for α=0.148rad showed a better coincidence with the linear viscoelastic predictions of viscosity η and first normal stress coefficient $$\psi _1 = N_1 /\dot \gamma ^2$$ compared to smaller cone