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ERRATUM

Erratum to: Hydrophobic modification of cellulose nanocrystal via covalently grafting of castor oil Wulin Shang • Jin Huang • Huan Luo • Peter R. Chang • Jiwen Feng • Guangyong Xie

Published online: 23 October 2013 Ó Springer Science+Business Media Dordrecht 2013

Erratum to: Cellulose (2013) 20:179–190 DOI 10.1007/s10570-012-9795-0 In the original publication, the formula and the calculated grafting ratio were incorrect, and the correction was depicted as follows: In virtue of the present proof on the grafting of CO onto the CN, element analysis was used to determine the grafting ratio (xGrafting ) of CO, i.e., the weight percentage of NCO-terminated PI-CO in CO-g-CN. Table 3 summarizes the experimental weight fractions of C, H, O, N and S elements for the CN and CO-g-CN and the theoretical values of C, O and N elements for NCO-terminated PI-CO. A small amount of the S element was derived from the sulfonic groups, which formed in the process of H2SO4 hydrolysis. According

to the weight fractions of the C element, the grafting ratio was calculated as 17.7 wt% by the following equation: xGrafting ¼

WCO-g-CN  WCN  100 % WNCO-PI -CO  WCN

where WCN , WCO-g-CN and WNCO-PI -CO are the experimental weight percentage of the C element in CN and CO-g-CN and the theoretical weight percentage of the C element in NCO-terminated PI-CO, respectively. In the part of ‘‘Conclusions’’ The results of FTIR, solid state 13C NMR, and XPS proved that the CO was successfully grafted onto the surface of CN, and the weight percentage of grafting chains in CO-grafted CN (CO-g-CN) was determined as 17.7 wt% by element analysis.

The online version of the original article can be found under doi:10.1007/s10570-012-9795-0. W. Shang  J. Huang (&) College of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, People’s Republic of China e-mail: [email protected]

P. R. Chang (&) BioProducts and Bioprocesses National Science Program, Agriculture and Agri-Food Canada, Saskatoon, SK S7N 0X2, Canada e-mail: [email protected]

H. Luo  J. Feng 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

G. Xie 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

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