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Polymerization of α,β‐unsaturated carbonyl monomers initiated by 9‐borabicyclo [3.3.1] nonane
Author(s) -
Kanno Shuichi,
Hosoi Masayoshi,
Ogata Tateaki,
Takeishi Makoto
Publication year - 1996
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199612)41:4<473::aid-pi651>3.0.co;2-4
Subject(s) - polymerization , chemistry , polymer chemistry , nitroxide mediated radical polymerization , radical polymerization , living free radical polymerization , nonane , hydroquinone , reversible addition−fragmentation chain transfer polymerization , ionic polymerization , copolymer , photochemistry , chain growth polymerization , bulk polymerization , kinetic chain length , organic chemistry , polymer
Abstract 9‐Borabicyclo[3.3.1]nonane (9‐BBN) initiated the polymerization of α,β‐unsaturated carbonyl monomers such as ethyl acrylate (EA) without an oxidant at low temperatures (to −90°C) under argon. Hydroquinone and 2,6‐di‐ tert ‐butyl‐ p ‐cresol had little effect on the polymerization, indicating that the propagating chain end is not a free radical. The rate of polymerization was found to be proportional to [9‐BBN] 1.0 and [EA] 1.5 . Electron spin resonance measurements using 5,5‐dimethyl‐1‐pyrroline‐ N ‐oxide as a spin trap showed the absence of any radical species under polymerization conditions. No copolymerization of EA with styrene occurred. On the basis of the results obtained, this polymerization was assumed to proceed via a non‐radical mechanism.