Viscosity behavior of incompatible poly(vinylchloride) (PVC) polystyrene (PS) blends in various solvents

The viscosimetric measurements were carried out for poly(vinyl chloride) (P VC), polystyrene (PS) and a (50:50) blend of incompatible PVC/PS in three d ifferent solvents at 20 degrees C. The results showed that the choice of so lvent had a great influence on the viscosity behavior of incompatible blend s. A detailed discussion, including about the compatible blends, was given in this article. It was concluded that, the viscosity behavior of a ternary polymer-polymer-solvent system originated from a superposition of several types of hydrodynamic and thermodynamic interactions. Specially, the nature of the solvent influenced the competition among these thermodynamic intera ctions in solution. (C) 1999 Elsevier Science Ltd. All rights reserved.