HEXAFLUORO-2-HYDROXY-2-PROPYL-MODIFIED POLYISOPRENE BLENDS

Dimensionlesa equilibrium constants describing the self-association of the hexafluoro-2-alkyl-2-propanol group have been determined from inf rared spectroscopic data. Corresponding values of these equilibrium co nstants for a fully modified polyisoprene containing the hexafluoroiso propanol group (PHFPI) were calculated by taking into account differen ces in the molar volume of the model and the specific repeat unit of t he polymer. Equilibrium constants describing the inter-association of PHFPI with methacrylate, acrylate, and acetoxy type carbonyl groups we re obtained from spectroscopic studies of miscible PHFPI blends with p oly (n -butyl methacrylate), poly (methyl acrylate), and an ethylene-c o-vinyl acetate copolymer containing 70 wt % vinyl acetate. The set of equilibrium constant values were then used to calculate theoretical m iscibility windows for the complete range of PHFPI blends with poly(n- alkyl methacrylate)s and four copolymers, ethylene-co-methyl methacryl ate, styrene-co-methyl acrylate, ethylene-co-methyl acrylate, and ethy lene-co-vinyl acetate. Experimental infrared studies confirm the gener al validity of the predicted miscibility windows. (C) 1994 John Wiley & Sons, Inc.