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Dialkylmagnesium‐Promoted Deprotonation of Protic Precursors for the Activated Anionic Ring‐Opening Polymerization of Epoxides
Author(s) -
Roos Kévin,
Wirotius AnneLaure,
Carlotti Stéphane
Publication year - 2018
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201700195
Subject(s) - polymer chemistry , chemistry , propylene oxide , copolymer , ethylene oxide , polymerization , monomer , ring opening polymerization , deprotonation , ether , anionic addition polymerization , epoxide , organic chemistry , polymer , catalysis , ion
Dialkylmagnesium (R 2 Mg) compounds are investigated as deprotonating agents of various protic functions to form reactive precursors for the anionic ring‐opening polymerization of epoxides, i.e., ethylene oxide, propylene oxide, butylene oxide, and methyl glycidyl ether, activated by triisobutylaluminum (i‐Bu 3 Al). Experiments show a polymerizability of those monomers with the proposed system, short reaction times (hours), and a molar mass control up to 10 000 g mol −1 . Protic moieties such as alcohol, thiol, amine, and alkyne are first deprotonated and then shown to initiate polyether chains. A precise study of the nature of the introduced groups in the α‐position of the polyether chains is presented. Monohydroxy terminated poly(ethylene oxide) and poly(dimethyl siloxane) are also used as macroinitiator after deprotonation by R 2 Mg for the polymerization of propylene oxide in the presence of i‐Bu 3 Al in order to get block copolymers.