Miscibility studies on some water soluble polymer-polymer blends

Dilute solution viscometric behavior of four polymer blends was studied at 20 +/- 0.1 degrees C. The ternary systems assayed are: Poly (vinyl alcohol) (PVA)/Poly vinylpyrollidone (PVP)/Distilled water (DW), PVA/Xanthan Gum (XG)/aq. NaCl, PVA/Poly (ethylene oxide) (PEO)/DW and PVP/PEO/DW The intrinsic viscosity and the viscometric interaction parameters have been determined for the binary (polymer/solvent) and ternary (polymer1/polymer2/solvent) systems. Degree of miscibility of these polymer blends was interpreted in terms of miscibility parameters, Delta b(m), Delta b(m)', Delta[eta](m), and mu. Based on these criteria, miscibility was observed in these systems. The miscibility of all these systems is in accordance with the interactions between the unlike polymer chains rather than the polymer-solvent interactions. Tensile strength of these polymer blend films was also determined.