Abstract
Poly(3,3′-dimethyl oxetane) was synthesized by cationic polymerization of 3,3′-dimethyl oxetane using triethyloxonium hexafluoroantimoniate as initiator. Six fractions were isolated by fractional precipitation with cyclohexane-ethanol. Characterization by viscometric and osmometric studies of solutions of fractions in cyclohexane at 25°C provided values of the intrinsic viscosity, number-average molecular weight and second virial coefficient. From these data, the characteristic ratio was estimated to be slightly higher than for the unsubstituted poly(trimethylene oxide) indicating that the spatial extension is scarcely affected by the dimethyl substitution on the main chain.
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