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Determination of Addition and Fragmentation Rate Coefficients in RAFT Polymerization via Time‐Resolved ESR Spectroscopy after Laser Pulse Initiation
Author(s) -
Buback Michael,
Hesse Pascal,
Junkers Tanja,
Vana Philipp
Publication year - 2006
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.200500716
Subject(s) - microsecond , polymerization , laser , acrylate , radical polymerization , materials science , spectroscopy , chain transfer , raft , analytical chemistry (journal) , pulse (music) , fragmentation (computing) , chemistry , nuclear magnetic resonance , optics , copolymer , polymer , organic chemistry , physics , quantum mechanics , detector , computer science , operating system , composite material
Summary: A method for simultaneous determination of both the addition and fragmentation rate coefficients of the RAFT equilibrium reactions is presented, which is based on laser single pulse initiation in conjunction with microsecond time‐resolved ESR spectroscopy. The build‐up and subsequent decay in concentration of the intermediate radical are measured and k ad and k β values are deduced from fitting the concentration versus time profiles to simple kinetic models.Normalized ESR signal intensity vs. time after firing an initiating laser pulse in BMPT‐mediated butyl acrylate polymerization.