Dynamics of concentrated polymer systems. Part 4.—Rheological properties

Abstract

The constitutive equation for polymer melts and concentrated solutions derived in the previous papers is applied to two typical rheometrical flows: steady and transient shear flow, oscillatory shear flow superposed on steady flow, steady and transient uniaxial elongational flow. The stress responses predicted are qualitatively in good agreement with experiments except for one case (the first normal stress in the transient shear flow). A particularly interesting result is that the constitutive equation suggests instability in steady shear flow and uniaxial elongational flow.