Journal
CARBOHYDRATE POLYMERS
Volume 123, Issue -, Pages 297-304Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.01.055
Keywords
Self-assembled; Nanostructured celluloses; Phosphoric acid; Dissolution; Regeneration; Temperature
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Funding
- Fundamental Research Funds for the Central Universities [KYZ201217]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- General Program of National Natural Science Foundation of China [31271829]
- Natural Science Foundation of Jiangsu Province [BK2012770]
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This report describes a green method for preparing self-assembled nanostructured cellulose through a dissolution and regeneration process. Cold phosphoric acid is used to dissolve cellulose in order to convert crystalline cellulose into its molecular form. Self-assembly of cellulose molecules into nanostructured cellulose is achieved by using water to regenerate cellulose. By controlling the temperature and time of the phosphoric acid treatment between dissolution and regeneration, the degree of polymerization and the degree of substitution of phosphorous for the regenerated celluloses can be tuned. As a result, cellulose nanofibers or nanospheres can be obtained when the treatment temperature is set to 5 or 50 degrees C, respectively. X-ray analysis shows that the cellulose nanofibers are amorphous and that the cellulose nanospheres are structured similarly to cellulose II with crystallinity indexes between 56 and 73%. Our method offers a green process for preparing nanostructured celluloses in high yields. (C) 2015 Elsevier Ltd. All rights reserved.
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