Excluded-Volume Effect of Polymethyl Methacrylate Solutions

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Abstract
Osmotic pressures of polymethyl methacrylate solutions in acetone and in benzene are examined over a wide range of concentration (0 < υ 2 < 0.17) . The data are used to evaluate the thermodynamic parameter B appearing in the excluded‐volume parameter z . The behavior of α η 3 = [η] / [η] 0 over a wide range of z(0 < z < 8) are compared to the theoretical predictions. The dependence of α η 3 on z seems to be approximately described by the modified Flory–Fox relation α η 5 − α η 3 = 1 03z . The observed dependence of h(z̄) = 2A 2 /N A B on z̄ for polymethyl methacrylate solutions is very close to the result for polystyrene solutions. It is found that log h(z̄) is not a linear function of log z 2 over a sufficiently wide range of z 2 (0 < z < 8) .

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