Abstract: Cationic polymerization of 5-methylene-2-norbomene, 5-ethylidene-2-norbornene, 5-vinyl-2-norbomene, dicyclopentadiene, and norbomadiene-2,5 in the presence of boranes was systematically studied. It was found that B(C6F5)(3) in combination with caprylic acid, 1-phenylethanol or water was a highly active catalyst for the polymerization of 5-alkylidene-2-norbornenes. The corresponding cationic polymers were obtained with up to yields 95% and with high molecular weights (M-w <= 430 000). The activity of 5-alkylidene-2-norbomenes in the polymerization using B(C6F5)(3) containing systems was the highest among the other monomers (5-vinyl-2-nobornene, dicyclopentadiene, and norbomadiene-2,5). BF3 center dot O(C2H5)(2) based catalysts turned out to be not so active for cationic polymerization of monomers compared with the systems containing B(C6F5)(3). They produced polymers predominantly containing the addition (vinyl) units instead of isomerization units. The structure of the polymer main chain units depended on the nature of the monomers: in the case of norbornadiene-2,5, 5-methylene-2-norbornene, and 5-ethylidene-2-norbornene the transannular polymerization proceeded, while dicyclopentadiene and 5-vinyl-2-norbornene formed the addition type polymers under the studied conditions.

Cite: Bermeshev M.V. , Bulgakov B.A. , Genaev A.M. , Kostina J.V. , Bondarenko G.N. , Finkelshtein E.S.
Cationic Polymerization of Norbornene Derivatives in the Presence of Boranes
Macromolecules. 2014. V.47. N16. P.5470-5483. DOI: 10.1021/ma5010919 WOS Scopus РИНЦ OpenAlex

Dates:

Published online:	Aug 15, 2014
Published print:	Aug 26, 2014

Identifiers:

Web of science:	WOS:000340992700004
Scopus:	2-s2.0-84906689572
Elibrary:	23986240
OpenAlex:	W2023038047

Citing:

DB	Citing
Web of science	43
Scopus	42
Elibrary	48
OpenAlex	45

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