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Hydrophobic modification of cellulose nanocrystal via covalently grafting of castor oil |
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| Authors: | Wulin Shang Jin Huang Huan Luo Peter R. Chang Jiwen Feng Guangyong Xie |
| Affiliation: | 1. College of Chemical Engineering, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China 2. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Science, Wuhan, 430070, People’s Republic of China 3. BioProducts and Bioprocesses National Science Program, Agriculture and Agri-Food Canada, Saskatoon, SK, S7N 0X2, Canada 4. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan, 430070, People’s Republic of China |
| Abstract: | 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 13C 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/m2 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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