Radiolysis of aqueous solutions of poly(ethylene oxide) at 77 Kстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Low-temperature (77 K) gamma-radiolysis of aqueous solutions of poly(ethylene oxide) was studied by ESR spectroscopy. Trapped electrons, hydroxyl radicals, and -CH2-<(C)over dot > H-O- radicals were identified as principal paramagnetic products of radiolysis. It was shown that an increase in the polymer concentration in solution led to a growth in number of trapped electrons and -CH2-<(C)over dot > H-O- macroradicals. The decay of hydroxyl radicals occurring at 110-115 K was accompanied by the formation of -CH2-<(C)over dot > H-O- macroradicals and partial recombination of hydroxyl radicals. Action of visible light resulted in virtually quantitative transformation of trapped electrons into -CH2-<(C)over dot > H-O- macroradicals. The radiation-chemical yields of the species trapped at 77 K were estimated and the scheme of radiation-induced chemical processes was suggested.