Zero Shear Viscosity and Steady State Shear Creep Compliance of Industrial High Density Polyethylene Melts using the Meissner’s Procedure－The Linearity and the Dependence on Molecular Weight and its Distribution

Abstract

Zero shear viscosity η₀ and steady state compliance J _e ⁰ are significant rheological parameters. Shear creep measurement could bring us these parameters. Meissner et al. reported their excellent procedure using the principle of Boltzmann’s superposition and the Ninomiya’s protocol. In this article the author revisited this procedure using industrial high density polyethylene. It was concluded that the Meissner’s procedure could give us stress independent (linear) values of the η₀ and the J _e ⁰ more properly than the traditional. The proposed η₀ was correlated with M _w ^4.5 (M _z/M _w). And theJ _e ⁰ had a reasonable relationship with MWD (molecular weight distribution), J _e ⁰ ∝(M _z/M _w)⁵ (M _n : the number averaged molecular weight, M _w : the weight averaged molecular weight and the M _z : the z-averaged molecular weight).