Abstract

Miscibility of poly(acrylonitrile) (PAN) with poly(vinyl chloride) (PVC) was investigated by dilute solution viscometry. Dilute
solution viscosity measurements were made on ternary systems, polymer (1)/polymer (2) solvent dimethylformamide for different
average molecular weights of PAN and PVC. The intrinsic viscosity and viscometric interaction parameters were determined for
binary (solvent/polymer) systems as well as the ternary systems by classical Huggins equation. Degree of miscibility of these
polymer systems was estimated on the basis of the three following criteria: (1) The sign of α, (2) the sign of ΔB, and (3) the sign
of μ. Based on the sign convention involved in these criteria, miscibility was observed in all of the systems under study. The
miscibility of all these systems in accordance with interaction between the unlike polymer chains rather than polymer–solvent
interactions was investigated depending on molecular weight of polymer sample.