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Cationisation of cellulose films with GTMAC following activation of cellulose alcohol functionality by treatment with NaOH (right). Oxidation of C6 1° alcohol groups to C6 carboxylate groups pH 10–11 (left). In both cases the reaction is primarily with primary OH groups accessible on the film surface and the degree of substitution, or oxidation, is controlled by modulating the quantity of reagent (GTMAC) or oxidant (NaOCl) added
