Viscometric study of poly(methyl methacrylate) and polystyrene blends in different solvents

The intermolecular interaction between poly(methyl methacrylate) (PMMA) and polystyrene (PS) in tetrahydrofuran (THF) and N,N'-dimethyl formamide (DMF) solvents was studied at 28degreesC using a dilute solution viscometry method. Solvent is believed to play a key role in characterizing the viscosity behavior of the polymer solution. The intrinsic viscosity and viscosity interaction parameter were experimentally measured for the binary (solvent/polymer) and for the ternary systems in two solvents. The compatibility of the polymer mixture was discussed in terms of the sign of Deltab(m). The results show that the compatibility of PMMA/PS blend in DMF is larger than that in THF.