Regioselective cationization of cellulosic materials using an efficient solvent-minimizing spray-techniqueReport as inadecuate




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Cellulose

, Volume 19, Issue 5, pp 1677–1688

First Online: 09 August 2012Received: 22 February 2012Accepted: 23 July 2012

Abstract

Cationization of different cellulosic materials was successfully accomplished using an efficient solvent-minimizing spray-technique. The obtained materials were studied and evaluated in regard to reaction efficiency and regioselectivity using 1D and H–C correlated 2D NMR experiments. The high consistencies and temperatures applied using the spray-technique resulted in reagent effective etherifications and shorter reaction times. The NMR spectra indicated that the spray-technique favors substitutions at position O-6, showing a regioselectivity of O-6 > O-2 > O-3 for softwood kraft pulp SKP and cotton linters. However, cationization of mercerized cellulose and dissolving pulp, using the spray-technique, demonstrated more efficient reactions compared to SKP and cotton, and a regioselectivity of O-6 ≥ O-2 > O-3. Nanocrystalline cellulose showed the lowest reactivity and a regioselectivity of O-6 ≫ O-2 > O-3. In this work we provide information on structure–property relationships and characterization methods for modified polysaccharides, together with a solvent system that is well known industrially and in line with sustainability aspects.

KeywordsCationization Softwood kraft pulp Nanocrystalline cellulose Dissolving pulp Regioselectivity NMR characterization Electronic supplementary materialThe online version of this article doi:10.1007-s10570-012-9755-8 contains supplementary material, which is available to authorized users.

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Author: Hanna de la Motte - Gunnar Westman

Source: https://link.springer.com/







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