CARB 64 |
| Hemicelluloses, which are next to cellulose, being the most abundant plant polysaccharides, are the important resource as renewable derived polymers to substitute for polymers prepared from petrochemicals. However, contrary to cellulose hemicelluloses are branched, amorphic polymers with considerable solubility in polar solvent systems. To enhance the solubility and their large structural variety, it is necessary for hemicelluloses to be chemically modified. In this study we investigated the preparation of hemicellulosic derivatives with quaternary ammonium groups. Water-soluble hemicellulosic derivatives with a high degree of substitution (DS) containing quaternary ammonium groups were prepared from hemicelluloses isolated from sugarcane bagasse with 3-chloro-2-hydroxypropyltrimthylammonium chloride (CHMAC) and 2, 3-epoxypropyltrimethylammonium chloride (ETA) in aqueous-alkaline solution. The DS values of the hemicellulosic derivatives can be controlled by adjusting the molar ratio of cationization agent to hydroxyl groups in unite of hemicelluloses and the molar ratio of sodium hydroxyl to cationization agent. The structure of water-soluble hemicellulosic derivatives was characterized by means of 13C NMR and IR spectroscopy. Hemicelluses, therefore, represent an important renewable resource for the production of novel cationic biopolymers. |
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General Posters
6:00 PM-8:00 PM, Tuesday, 28 March 2006 Georgia World Congress Center -- Ex. Hall B4, Poster
Sci-Mix
Division of Carbohydrate Chemistry |