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In situ ESR response to temperature evolution of styrene/dibenzoyl peroxide/Di‐TEMPO biradical system
Author(s) -
Szydłowska Jadwiga,
Kaim Andrzej,
Pietrasik Krzysztof,
Trzciñska Kinga
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.32161
Subject(s) - electron paramagnetic resonance , styrene , peroxide , atmospheric temperature range , polymerization , polymer chemistry , chemistry , radical , photochemistry , range (aeronautics) , copolymer , materials science , polymer , nuclear magnetic resonance , thermodynamics , organic chemistry , physics , composite material
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. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010