THERMODYNAMICS OF BLENDS OF POLY(ETHYLENE OXIDE) WITH POLY(METHYL METHACRYLATE) AND POLY(VINYL ACETATE) - PREDICTION OF MISCIBILITY BASED ON FLORY SOLUTION THEORY MODIFIED BY HAMADA

Flory solution theory modified by Hamada et al. (Macromolecules, 1980, 13, 729) was used to predict the miscibility of blends of poly(ethyle ne oxide) with poly(methyl methacrylate) (PEO-aPMMA) and with poly(vin yl acetate) (PEO-PVAc). Interaction parameters of a PEO-aPMMA blend wi th the weight ratio of PEO/aPMMA = 50/50 at the temperature range of 3 93-433 K and PEO-PVAc blends with different compositions and temperatu res were calculated from the determined equation-of-state parameters b ased on Flory solution theory modified by Hamada ed al. Results show t hat interaction parameters of the PEO-aPMMA blend are negative and can be comparable with values obtained from neutron-scattering measuremen ts by Ito et al. (Macromolecules, 1987, 20, 2213). Also, interaction p arameters and excess volumes of PEO-PVAc blends are negative and incre ase with enhancing the content of PEO and the temperature. (C) 1998 El sevier Science Ltd. All rights reserved.