On testing the Cox-Merz rule as applied to simple polymer melts

DOI: 10.5176/2301-3761_CCECP14.07

Authors: Montgomery T. Shaw

Abstract:

Because of its simplicity, the Cox-Merz rule has been widely applied by practitioners to the prediction of melt viscosity of polymer melts under processing conditions. In this work, the applicability of the Cox-Merz rule to a stable and simple melt (PDMS) was tested in the near-Newtonian region. Evidence was found that it did not apply exactly, suggesting that its use at high shear rates could be highly misleading.

Keywords: PDMS, Cox-Merz rule