Journal
CARBOHYDRATE POLYMERS
Volume 80, Issue 4, Pages 1078-1084Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2010.01.027
Keywords
Acetylation; Starch nanocrystals; Degree of substitution; Organic-soluble; Solubility; Hydrophobicity
Categories
Funding
- Key Projects in the National Science & Technology Pillar Programs [2007BAE28B06]
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Efficient procedures for the preparation of organic-soluble starch nanocrystal (SN) derivatives have been established with different degrees of substitution (DS). The resulting acetylated starch nanocrystals exhibit much improved solubility in common organic solvents such as N,N-dimethylformamide, acetone, carbon tetrachloride and toluene. The obtained nanocrystals were characterized by means of the FT-IR, H-1 NMR and X-ray photoelectron spectroscopic techniques. When compared with the hydrophobic performance of the unmodified starch nanocrystals, that of acetylated starch nanocrystals significantly increased according to the contact angle measurement results. X-ray diffraction reveals that the crystalline structure of acetylated starch nanocrystals was changed from style A to style V. The platelet-like starch nanocrystals become sphere-shaped after modification and the size increases compared to the ungrafted particles as revealed by transmission electron microscopic results. They are versatile precursors to nanoparticle-based copolymers, composites, and metal ligands. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.
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