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Determination of isopropyl peroxydicarbonate decomposition rate constant using EPR
Author(s) -
Rathke P. P.
Publication year - 1970
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.1970.070140207
Subject(s) - electron paramagnetic resonance , radical , isopropyl , decomposition , dpph , toluene , reaction rate constant , chemistry , analytical chemistry (journal) , absorption (acoustics) , photochemistry , materials science , nuclear magnetic resonance , organic chemistry , kinetics , physics , antioxidant , composite material , quantum mechanics
The decomposition rate constant, k d , of isopropyl peroxydicarbonate in toluene at 23.3°C was determined using electron paramagnetic resonance techniques (EPR). Diphenylpicrylhydrazyl (DPPH) was used to monitor the formation of radicals. Because DPPH has a strong absorption spectrum on the EPR, the accuracy of measuring small changes in the indicator concentration should be greater than measuring small concentrations of primary radicals. A value for k d of 4.5 × 10 −7 sec −1 was obtained. This is in good agreement with previously published values.