The Flow Behavior of Semirigid and Rigid Poly(vinyl Chloride) Formations

Abstract

Industrial semirigid and rigid formulations of poly(vinyl chloride) were tested using the cone-and-plate Weissenberg Rheogoniometer in the steady shearing mode and the Instron Capillary Rheometer. The viscosity dependence on shear rate showed a discontinuity at a critical shear stress, σ12,cr, given by log σ12,cr=4.9±0.2 where the shear stress is in dynes/cm2. Both parts of the viscosity-shear rate curve could be superimposed on master curves according to the theory proposed by Graessley and Segal.