Abstract
The results of theoretical and experimental studies of poly(4-vinyl phenol) (PVPh) blends with a series of poly(n-alkyl methacrylates) are presented. PVPh is miscible with poly(methyl methacrylate), poly(ethyl methacrylate) and poly(n-propyl methacrylate) over the entire composition range at temperatures between ambient and 200°C. In contrast, PVPh—poly(n-butyl methacrylate) blends phase separate at temperatures below 200°C. Quantitative analyses of the fraction of hydrogen bonded carbonyl groups were obtained by FTi.r. spectroscopy for all the PVPh blends—poly(n-alkyl methacrylates) as a function of composition and temperature. The data obtained from the miscible blend systems was employed to determine values of the equilibrium constant describing inter-association, K A, and the enthalpy of hydrogen bond formation, h A. Theoretical fractions of hydrogen bonded carbonyl groups and spinodal phase diagrams were calculated using a recently reported association model. The results compare very favourably to experiment.
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