Evaluation of planar and uniaxial extensional viscosities for linear and branched polyolefins

Abstract

In this work, planar and uniaxial extensional viscosities for linear and branched polyolefins has been determined through entrance pressure drop technique on conventional twin bore capillary rheometer by using novel circular and rectangle orifice dies and the capability of two different constitutive equations to describe the measured experimental data has been tested.