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2013 ; 3
(4
): 638-654
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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
#MMPMID28348357
Benkaddour A
; Jradi K
; Robert S
; Daneault C
Nanomaterials (Basel)
2013[Dec]; 3
(4
): 638-654
PMID28348357
show ga
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.