ISSN:
0887-6266
Schlagwort(e):
vinyl polymerization, redox initiated, ESR study of
;
electron spin resonance (ESR) study of redox initiated vinyl polymerization
;
radical mechanism of redox initiated vinyl polymerization
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
An electron spin resonance (ESR) study confirms a free radical mechanism for aqueous vinyl polymerization initiated by three redox systems involving thiourea. The primary radical, NH2—C (=NH)S., could not be detected by ESR spectroscopy, perhaps because of its large g anisotropy and/or very short relaxation time. Propagating radicals are trapped from methyl-methacrylate by 2-methyl-2-nitroso propane (MNP) and their structures are found to be the same as those produced by either azo-bis-isobutyrnitrile or di-t-butyl peroxylate. The latter monomer, however, reacts with MNP in the absence of any initiator, giving different ESR lines.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/polb.1992.090300502
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