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ESR study on radical polymerization and its application to microemulsion systems
Author(s) -
Kamachi Mikiharu,
Kajiwara Atsushi
Publication year - 2002
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 - 10.1002/1521-3900(200203)179:1<53::aid-masy53>3.0.co;2-r
Subject(s) - polymerization , radical , radical polymerization , diene , photochemistry , methyl methacrylate , chemistry , electron paramagnetic resonance , polymer chemistry , polymer , materials science , organic chemistry , nuclear magnetic resonance , natural rubber , physics
Well‐resolved electron spin resonance (ESR) spectra of propagating radicals of vinyl and diene compounds were observed in a single scan by a conventional CW‐ESR spectrometry without the aid of computer accumulation and the specially designed cavity and cells. Although solvents which could be used for ESR measurements were restricted to nonpolar solvents, such as benzene, toluene, and hexane, new information on dynamic behavior and reactivity of the propagating radicals in the radical polymerization of vinyl and diene compounds were obtained. Thus, values of propagation rate constants ( k p ) for vinyl and diene compounds were determined by an ESR method. Some of the k p values were in a fair agreement with those obtained by a pulsed laser polymerization (PLP) method. Furthermore, polymer chain effect on apparent k p was clearly observed in the radical polymerization of macromonomers and in the microemulsion polymerization. In ESR measurement on inclusion polymerization system, important information on the origin of the 9‐line spectrum observed in the radical polymerization of methacrylate propagating radicals was obtained.