The Heats of Dilution in Atactic Polymethyl Methacrylate Solutions

Abstract

Abstract In order to ascertain the dependence of the interaction parameter, χH, between the polymer and the solvent molecules on the polymer concentration, the heats of dilution in an atactic polymethyl methacrylate solution have been measured for the polymers with the degrees of polymerization of 3000 and 7800. It was found that the values of χH obtained are dependent on the concentration in all the solvents used, as in the solutions of polystyrene and polybutadiene reported as in previous papers. χH depends also on the molecular weight, this is in agreement with the suggestion by Huggins (J. Am. Chem. Soc., 86, 3535 (1964)).