Oxidation of cellulose fibers mediated by nonpersistent nitroxyl radicals
Biliuta, Gabriela ...
Three different nonpersistent radicals bearing >NO moiety have been used to oxidize the viscose fibers at room temperature and alkaline pH. The generation of the free radical species was achieved in ...situ, from their corresponding OH precursors: 1-hydroxybenzotriazole, violuric acid, and N-hydroxy-3,4,5,6-tetraphenylphthalimide. Three different routes were used: (i) in the presence of metallic cocatalyst (lead tetraacetate), (ii) under metal-free conditions (anthraquinone as organic cocatalyst), and (iii) a homolytically scission of OH bond through a 365-nm UV irradiation. The oxidized fibers were subjected to attenuated total reflection FTIR characterization, potentiometric titration, wide angle X-ray, energy dispersive X-ray analyses, microscopic investigations, and solid-state 13C-NMR. The patterns of CP/MAS 13C-NMR spectra revealed that the oxidation occurred at the C6 primary hydroxyl groups of cellulose. Notably, as a result of the introduction of hydrophilic carboxylate groups, the water retention values of the oxidized fibers increased by 35% as compared to the original nonoxidized sample.
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