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- W2068493973 abstract "The efficiency of homolytic splitting of the OH bond of different phenols, bisphenols, thiophenols, naphthols, and benzophenones and the transfer of the hydrogen atom to an alkoxy or alkyl-peroxy radical is a function of the electro-affinity of the substituent in the ortho position. The stability of the formed phenoxy radical is in relation to the delocalization of free electron in the para position, especially if the substituent has aromatic character. The inhibition effect of thermal oxidation is found to be the highest in that case where the substituent does not hinder the recombination of RO2 radicals with those of antioxidant.According to the electron paramagnetic resonance spectra of the generated phenoxy radicals the differently substituted phenols can be divided into five main groups: 1) phenols which form primary stable free radicals; 2) phenols which form secondary stable free radicals, 3) phenols which give stable phenoxy radicals only after coordination into the ligand field of the transition metal; 4) phenols whose radicals undergo disproportionation; 5) phenols substituted with NO2 groups which do not form free radicals in nonpolar solvent.Cobalt traces induce the decomposition of hydroperoxides generated in thermal initiation of polymer oxidation by quite a similar redox mechanism as the one observed in the fixation of RO2 radicals on transition metal. But the cobalt compounds are not active in polymers if those are free from oxidation products (hydroperoxy groups)." @default.
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- W2068493973 date "2007-03-08" @default.
- W2068493973 modified "2023-09-29" @default.
- W2068493973 title "The reactivity of antioxidants with peroxy and alkoxy radicals in the presence of transition metals. I. Relation between the structure of free antioxidant radicals and inhibition of oxidation in polymers" @default.
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- W2068493973 doi "https://doi.org/10.1002/polc.5070400115" @default.
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