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Kinetic behavior of propagating radical in bulk polymerization of styrene
Author(s) -
Shen JiaCong,
Wang GuoBin,
Zheng YingGuang,
Yang MeiLin
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920630110
Subject(s) - polystyrene , radical polymerization , polymerization , styrene , kinetic energy , photochemistry , chemistry , relaxation (psychology) , materials science , radical , polymer chemistry , copolymer , polymer , organic chemistry , physics , psychology , social psychology , quantum mechanics
High resolution ESR spectra of polystyrene radical at various conversion in the bulk polymerization have been determined. The propagation and termination rate coefficients during the whole process of polymerization were evaluated from the conversion and the propagating radical concentration determined by ESR. It was found that the propagating radical has two stable conformations. The reduction of the radical activity with the conversion is partly resulting from the wrapping effect which is due to the far slower segment relaxation and the very rapid propagation.