Abstract
AbstractThe cationic copolymerization of tetrahydrofuran with propylene oxide was investigated with the use of boron trifluoride etherate, 1,2,3‐propanetriol, and ethylene chloride as catalyst, cocatalyst, and solvent, respectively. The reactions were carried out in the liquid phase under a blanket of dry nitrogen at atmospheric pressure and in the temperature range from −10° to +20°C. Comonomer consumption was followed by vapor‐phase chromatography, while the products were analyzed by gel‐permeation chromatography, nuclear magnetic resonance, vapor‐pressure osmometry, and chemical endgroup analysis (phthalation). The investigation was directed towards the elucidation of the influence of the initial cocatalyst content, the initial mole fraction of the comonomer, and the temperature of reaction, on the kinetics of the reaction (rates of disappearance of comonomers, reactivity ratios, comonomer conversions and product yields) and on the characteristics of the products formed (composition, molecular weight, and primary and secondary hydroxyl content). An attempt is made to interpret the results reported in the paper.
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