Abstract
Propionaldehyde and sodium perchlorate have a marked effect not only on kinetics of copolymerization of propylene oxide and tetrahydrofuran (THF) initiated by BF 3, and also on molecular weight characteristics of the copolymer obtained. The ability of polar compounds to solvate BF 3 complexes and growing centres slows down all the reactions in which they take part. For example, the rate of isomerization of propylene oxide and the formation of a cyclic tetramer decreases, while the concentration of the latter during the process passes through the maximum. This is explained by the existence of chain transfer to a cyclic tetrameter with ring opening.
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