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Free radical kinetics in irradiated ethyl cellulose as determined by electron spin resonance measurements
Author(s) -
Loy B. R.
Publication year - 1962
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760020227
Subject(s) - radical , electron paramagnetic resonance , kinetics , irradiation , ethyl cellulose , cellulose , materials science , liquid nitrogen , photochemistry , electron , nitrogen , spin (aerodynamics) , resonance (particle physics) , analytical chemistry (journal) , nuclear magnetic resonance , chemistry , atomic physics , organic chemistry , thermodynamics , polymer , nuclear physics , composite material , physics , quantum mechanics
Electron spin resonance techniques are used to investigate the structure and decay of radicals produced in irradiated ethyl cellulose. Approximately 99% of the radicals trapped at liquid nitrogen temperature appear to be—C 2 H 4 . radicals. These decay immeasurably fast at room temperature. The relatively stable doublet that remains is believed to be due to the CHO radical. The kinetics of the doublet decay are studied as a function of temperature and dose. The data may be interpreted as resulting from simultaneous first and second order processes at lower doses and from a second order process at higher doses.