期刊
MACROMOLECULAR BIOSCIENCE
卷 9, 期 10, 页码 997-1003出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mabi.200900073
关键词
acetylation; atomic force microscopy (AFM); cellulose nanowhiskers; C-13 CP-MAS NMR spectroscopy; FT-IR ATR spectroscopy; vinyl acetate; wide-angle X-ray analysis
资金
- National Science Foundation
- U.S. Department of Energy [DMR-0706323, DEFG3605GO85014]
- Division of Materials Sciences and Engineering, U.S. Department of Energy
- TUBITAK [BIDEB-2219]
A novel and straightforward method for the surface acetylation of cellulose nanowhiskers by transesterification of vinyl acetate is proposed. The reaction of vinyl acetate with the hydroxyl groups of cellulose nanowhiskers obtained from cotton linters was examined with potassium carbonate as catalyst. Results indicate that during the first stage of the reaction, only the surface of the nanowhiskers was modified, while their dimensions and crystallinity remained unchanged. With increasing reaction time, diffusion mechanisms controlled the rate, leading to nanowhiskers with higher levels of acetylation, smaller dimensions, and lower crystallinity. In THF, a solvent of low polarity, the suspensions from modified nanowhiskers showed improved stability with increased acetylation.
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