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Oxidation of TMP fibers at 298 K with molecular oxygen, in the presence of either [Co(salen)] in methanol or [Co(sulphosalen)] in water, were compared. Electron paramagnetic resonance (EPR) spectroscopy allowed to reveal and quantify the formation of phenoxy cobalt radicals in the former case and of phenoxy radicals in the latter. These radicals reach the same concentration after 60 min from the onset of reaction. Fiber integrity was more preserved after oxidation in water than in methanol, asdoaj:cad9a7e5ed744796b1409e46654c7e5e fatcat:mk5dmyfwyfc4fdprlbdxcuod4u