期刊
CARBOHYDRATE POLYMERS
卷 153, 期 -, 页码 143-152出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.07.073
关键词
Cellulose nanocrystals; Soy hulls; Agro-industrial residue; Natural rubber; Aspect ratio; Nanocomposites
资金
- CAPES
- FAPEMIG
- CNPq
- Federal University of Uberlandia
- CERMAV
- Institut Carnot PolyNat (Investissements d'Avenir - grant agreement) [ANR-11-CARN-030-01]
- LabEx Tec 21 (Investissements d'Avenir - grant agreement) [ANR11-LABX-0030]
Cellulose nanocrystals (CNCs) were isolated from soy hulls by acid sulfuric hydrolysis. The resulting CNCs were characterized using TEM, AFM, WAXS, elemental analysis and TGA. The CNCs have a high crystallinity, specific surface area and aspect ratio. The aspect ratio (around 100) is the largest ever reported in the literature for a plant cellulose source. These CNCs were used as a reinforcing phase to prepare nanocomposite films by casting/evaporation using natural rubber as matrix. The mechanical properties were studied in both the linear and non-linear ranges. The reinforcing effect was higher than the one observed for CNCs extracted from other sources. It may be assigned not only to the high aspect ratio of these CNCs but also to the stiffness of the percolating nanoparticle network formed within the polymer matrix. Moreover, the sedimentation of CNCs during the evaporation step was found to play a crucial role on the mechanical properties. (C) 2016 Elsevier Ltd. All rights reserved.
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