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RAFT‐Polymerization of Styrene up to High Pressure: Rate Enhancement and Improved Control
Author(s) -
Arita Toshihiko,
Buback Michael,
Janssen Olaf,
Vana Philipp
Publication year - 2004
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200400204
Subject(s) - chain transfer , polymerization , dispersity , polystyrene , styrene , raft , polymer chemistry , reversible addition−fragmentation chain transfer polymerization , materials science , bulk polymerization , living polymerization , chemistry , radical polymerization , copolymer , polymer , composite material
Summary: Application of high pressure, up to 2 500 bar, in cumyl dithiobenzoate‐mediated styrene reversible addition fragmentation chain transfer (RAFT) polymerizations was found to be extremely advantageous with respect to both rate and control of polymerization. The overall rate of polymerization could be increased by a factor of approximately 3 with, e.g., at 23% conversion, concomitantly reducing the polydispersity indices from 1.35 to 1.10. No significant effect of increased pressure on the rate retardation effect was found.SEC curves of polystyrene samples with identical peak molecular weights, generated by CDB‐mediated styrene bulk polymerization at 70 °C at 1 and at 2 000 bar.