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Cellulose

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01-02-2013 | Original Paper

Hydrophobic modification of cellulose nanocrystal via covalently grafting of castor oil

Authors: Wulin Shang, Jin Huang, Huan Luo, Peter R. Chang, Jiwen Feng, Guangyong Xie

Published in: Cellulose | Issue 1/2013

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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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Title: Hydrophobic modification of cellulose nanocrystal via covalently grafting of castor oil
Authors: Wulin Shang
Jin Huang
Huan Luo
Peter R. Chang
Jiwen Feng
Guangyong Xie
Publication date: 01-02-2013
Publisher: Springer Netherlands
Published in: Cellulose / Issue 1/2013
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-012-9795-0

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