期刊
CELLULOSE
卷 20, 期 1, 页码 179-190出版社
SPRINGER
DOI: 10.1007/s10570-012-9795-0
关键词
Cellulose nanocrystal; Castor oil; Grafting; Hydrophobicity
资金
- Supporting Project of New Century Excellent Talents of Ministry of Education of China [NCET-11-0686]
- National Natural Science Foundation of China [21172269]
- Fundamental Research Funds for the Central Universities (Self-Determined and Innovative Research Funds of WUT) [2012-Ia-006]
- ecoENERGY Innovation Initiative of Canada
- Program of Energy Research and Development (PERD) of Canada
Hydrophobic cellulose nanocrystals (CNs) have been prepared by grafting isocyanate-terminated castor oil, a kind of natural vegetable oil, onto their surface. The existence of castor oil component in the modified cellulose nanocrystals was verified by Fourier transform infrared spectroscopy, solid-state C-13 NMR spectra and X-ray photoelectron spectroscopy. At the same time, X-ray diffraction and transmission electron micrographs further proved that the crystalline structure and large aspect ratio of cellulose nanocrystals were essentially preserved after chemical grafting. Furthermore, the surface of modified cellulose nanocrystals appeared to be hydrophobic as indicated by contact angle measurements. The value of the polar component of surface energy decreased from 21.5 mJ/m(2) to almost zero via grafting castor oil. These novel hydrophobic castor oil-grafted cellulose nanocrystals appear as valuable alternatives to formulate bionanocomposites with non-polar polymers for optimized performances.
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