Tetrahydrofuran has been polymerised at 0°C. with triphenylmethyl hexachloroantimonate‐(V) and the polymer resolved into 10 fractions by fractional precipitation. Within the range M̄ n = 32,300 to 118,000 the relationship [η] = 2.51.10 ‐4 (M̄ n ) 0.78 obtains in toluene at 28°C. Confirmation is afforded of a previously reported variation of the H UGGINS viscosity slope constant with intrinsic viscosity. Examination of the temperature dependence of the second osmotic virial coefficient yields values of 245°K., 0.38, and 93.1 for the Θ‐point and the pair interaction entropy and enthalpy parameters ψ 1 and x 1 respectively.
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Ali et al. (1965) studied this question.
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