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Elementary Steps of Initiation and Termination Processes in Radical Polymerization
Author(s) -
Buback Michael
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200550812
Subject(s) - radical , decomposition , polymerization , monomer , electron paramagnetic resonance , photochemistry , excimer , chemistry , peroxide , kinetics , radical polymerization , polymer , polymer chemistry , laser , nuclear magnetic resonance , organic chemistry , optics , physics , quantum mechanics
Investigations into the kinetics of primary radicals produced in photochemically and thermally induced decomposition of peroxides of type R 1 C(O)O‐OR 2 are presented. The correlation of peroxide structure with decomposition rate and with initiator efficiency in radical polymerizations is discussed. Termination rate coefficients, k t , as a function of temperature, pressure, polymer content, and of chain length may be deduced from two types of time‐resolved experiments in which, after applying an excimer laser pulse, either monomer conversion is measured via near‐infrared spectroscopy or the decay in radical concentration is monitored via electron spin resonance.