Abstract
Light-scattering and viscosity measurements have been carried out on dilute solutions of poly(4-hydroxystyrene) (PHS) fractions, which were obtained by hydrolysis of poly(4-acetoxystyrene) (PAS). The Mark-Houwink-Sakurada equations were determined in dioxane, tetrahydrofuran, isobutyl acetate and ethyl propionate at 25°C. The unperturbed dimension and the thermodynamic interaction parameters for PHS in various solvents were also determined and compared with those previously obtained for PAS. It was concluded that the hindrance potential of rotation around the C-C bond in the main chain of PHS is influenced more than expected solely from the volume effect of side groups, but it is within the same range found for other polar para-substituted polystyrenes. Also, it was found that in contrast to the PAS-solvent system there are significant energetic and entropic interactions between segments of PHS and solvent molecules, arising from the presence of a hydroxyl group in the side chain.
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