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Specific features of tetrahydrofuran copolymerization with lactones

✍ Scribed by A.K. Khomyakov; E.B. Ludvig; N.N. Shapetko

Publisher: Elsevier Science
Year: 1981
Tongue: English
Weight: 449 KB
Volume: 17
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(81)90033-1

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✦ Synopsis

Mechanistic r~atures of the cationic copolymerization of lactones with cyclic ethers are studied for fl-propiolactona ~ ?L) with tetrahydrofuran (THF) and E-caprolactone (CLI with THF. It is shown that, in the PL THF system at [THF]0 > [THF]~, the copolymer is considerably enriched with the more basic THF whereas at [THF]o < [THF]e anomalous enrichment of the copolymer with the less basic PL is observed. The mechanism of this phenomenon, which is applicable to many other cases and causes the formation of block copolymers from some heterocyclic monomers, is considered. At concentrations below equilibrium, THF is incorporated in the copolymer as pairs of units due to the effect of the penultimate unit on the thermodynamics of its addition.

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