Abstract
Abstract The polymerization of tetrahydrofuran and 1,4-epoxycyclo-hexane initiated by triethyloxonium hexachloroantimonate has been studied at temperatures below 0°C. It has been found that during polymerization of tetrahydrofuran in bulk at temperatures of -25°C and below the polymer crystallizes from a solution of its own monomer. The crystallization accelerates the polymerization somewhat. A chain transfer reaction takes place at higher conversion according to molecular weight and molecular weight dis-tribution measurements. The crystallization of poly(1, 4-epoxycyclohexane) during polymerization at -15°C in methylene chloride starts im-mediately after polymerization has been initiated. At very low conversion the distribution of molecular weight is unimodal and narrow; at higher conversion the distribution of molecular weight is bimodal, the high molecular weight peak becomes more prominent, and the distribution broader with increasing conversion. It is suggested that the low molecular weight peak corresponds to the polymer fraction
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