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Free radical initiation mechanisms in copolymerisation studied by the nitroxide trapping technique
Author(s) -
Ken Busfield W.,
Darren Grice I.,
Jenkins Ian D.
Publication year - 1992
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/pi.4990270205
Subject(s) - acrylonitrile , monomer , nitroxide mediated radical polymerization , radical , chemistry , polymer chemistry , photochemistry , vinyl acetate , adduct , copolymer , radical polymerization , organic chemistry , polymer
The initiation mechanism for the radical copolymerisation of vinyl acetate, a typical electron donor monomer, and acrylonitrile, a typical electron acceptor monomer, initiated by t ‐butoxy radicals, has been investigated by the nitroxide radical trapping technique: 1,1,3,3‐tetramethyl‐1,3‐dihydroisoindol‐2‐yloxyl (T) was the radical trapping agent. Two adducts (diastereomers) containing both vinyl acetate and acryionitrile monomers were isolated. From a kinetic analysis of these and other products over a wide range of conditions, a mechanism involving separate monomer addition, which may be regarded as normal kinetic control of monomer addition, is shown to be most consistent with the observed results.