In situ ESR response to temperature evolution of styrene/dibenzoyl peroxide/Di-TEMPO biradical system

The initial stage of the di-TEMPO (N,N′-bis(4-(2,2,6,6-tetramethylpiperidin-1-yloxyl))diaminobutane) controlled radical polymerization of styrene was investigated by electron spin resonance (ESR) method in a temperature range of 300-410 K. Processes corresponding to three subsequent temperature subr...

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Veröffentlicht in:	Journal of applied polymer science 2010-08, Vol.117 (4), p.2036-2041
Hauptverfasser:	Szydłowska, Jadwiga, Kaim, Andrzej, Pietrasik, Krzysztof, Trzciñska, Kinga
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences biradicals Capping Electron paramagnetic resonance Electron spin resonance electron spin resonance (ESR) Evolution Exact sciences and technology nitroxide mediated radical polymerization (NMRP) Organic polymers Physicochemistry of polymers Polymerization polystyrene Preparation, kinetics, thermodynamics, mechanism and catalysts radical polymerization Radicals Reproduction Styrenes
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Beschreibung
Zusammenfassung:	The initial stage of the di-TEMPO (N,N′-bis(4-(2,2,6,6-tetramethylpiperidin-1-yloxyl))diaminobutane) controlled radical polymerization of styrene was investigated by electron spin resonance (ESR) method in a temperature range of 300-410 K. Processes corresponding to three subsequent temperature subranges 300-360, 360-375, and 375-410 K have been discussed. The decrease of concentration of the di-TEMPO biradicals is faster than for the TEMPO monoradicals in the range 370-390 K. The reduced mobility of capping groups is postulated to be responsible for the differences between TEMPO monoradical and di-TEMPO biradical mediators.
ISSN:	0021-8995 1097-4628 1097-4628
DOI:	10.1002/app.32161