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New chain transfer agents for free radical polymerizations
Author(s) -
Meijs Gordon F.,
Rizzardo Ezio,
Le Tam P. T.
Publication year - 1991
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.4990260407
Subject(s) - chain transfer , catalytic chain transfer , methyl methacrylate , methyl acrylate , styrene , polymer chemistry , radical polymerization , vinyl acetate , acrylate , transfer agent , butyl acrylate , chemistry , materials science , polymerization , copolymer , organic chemistry , polymer
The palmitoyl ester of N ‐hydroxypyridine‐2‐thione displayed useful chain transfer properties in free radical polymerizations of methyl methacrylate and styrene. Retardation, however, accompanied the lowering of molecular weight in methyl acrylate and vinyl acetate polymerizations. 4‐Methyl‐3‐palmitoyloxythiazol‐2(3H)‐thione had good chain transfer activity with methyl methacrylate, styrene and methyl acrylate. Although benzyl thionobenzoate exhibited virtually ‘ideal’ behaviour (chain transfer constant C x ∼1) in styrene and methyl acrylate polymerizations, it was ineffective in lowering molecular weight of poly(methyl methacrylate). Severe retardation was observed with vinyl acetate. Addition‐fragmentation pathways are postulated for chain transfer.