Abstract
AbstractMeasurements of intrinsic viscosity on polystyrene fractions in cyclohexane, methyl ethyl ketone (MEK), and MEK‐cyclohexane, MEK‐methanol mixture at 34°C., measurements of intrinsic viscosity and of second virial coefficient on polymethyl methacrylate fractions in MEK at 25°C. are reported.The experimental results allow to point out that in non Θ‐solvents the expansion coefficient α is equal to one also for relatively high molecular weights. The second virial coefficient, in these solvents, is always ≠ 0 and increases with the decreasing of the molecular weights just where α tends to one.These results point out that the actual theories are more limited than expected.
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