The hydrolytic method using 72% sulphuric acid was modified in order to characterize the graft copolymer cellulose‐g‐poly(vinyl acetate‐co‐methyl acrylate). This method involves appropriate cellulose hydrolysis conditions, and the extraction of a fraction of cellulose only when the samples have a low ratio of synthetic polymer to cellulose. In this way, an undesired chemical transformation of the grafted chains is avoided and the polysaccharide is completely removed from the synthetic polymer. This method might be extended to other cellulosic graft copolymers whose carbohydrate part cannot be completely separated and their grafted chains are labile in the reaction conditions reported in the literature.
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Fernández et al. (1988) studied this question.
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