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Study of the Effect of Grafting Method on Surface Polarity of Tempo-Oxidized Nanocellulose Using Polycaprolactone as the Modifying Compound: Esterification versus Click-Chemistry

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Lignocellulosic Materials Research Center, University of Quebec at Trois-Rivières, 3351 Boulevard des Forges, Trois-Rivières, QC G9A 5H7, Canada
2
Canada Research Chair in Value-Added Papers, 3351 Des Forges, Trois-Rivières, Québec G9A 5H7, Canada
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Author to whom correspondence should be addressed.
Nanomaterials 2013, 3(4), 638-654; https://doi.org/10.3390/nano3040638
Received: 15 October 2013 / Revised: 11 November 2013 / Accepted: 6 December 2013 / Published: 12 December 2013
Esterification and click-chemistry were evaluated as surface modification treatments for TEMPO-oxidized nanocelluloses (TONC) using Polycaprolactone-diol (PCL) as modifying compound in order to improve the dispersion of nanofibers in organic media. These two grafting strategies were analyzed and compared. The first consists of grafting directly the PCL onto TONC, and was carried out by esterification between hydroxyl groups of PCL and carboxyl groups of TONC. The second strategy known as click-chemistry is based on the 1,3-dipolar cycloaddition reaction between azides and alkyne terminated moieties to form the triazole ring between PCL and TONC. The grafted samples were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Thermogravimetry analysis (TGA). Further, the effects of the two treatments on the surface hydrophobization of TONC were investigated by contact angle measurements. The results show that both methods confirm the success of such a modification and the click reaction was significantly more effective than esterification. View Full-Text
Keywords: nanocellulose; grafting; polycaprolactone; esterification; click-chemistry nanocellulose; grafting; polycaprolactone; esterification; click-chemistry
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Benkaddour, A.; Jradi, K.; Robert, S.; Daneault, C. Study of the Effect of Grafting Method on Surface Polarity of Tempo-Oxidized Nanocellulose Using Polycaprolactone as the Modifying Compound: Esterification versus Click-Chemistry. Nanomaterials 2013, 3, 638-654.

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