Journal
CARBOHYDRATE POLYMERS
Volume 117, Issue -, Pages 83-90Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.09.055
Keywords
Bionanocomposite; Thermoplastic starch; Polysaccharide nanocrystals; Morphology; Thermal, mechanical and barrier properties
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Funding
- Basque Country Government [S-PE12UN036, IT-776-13]
- University of the Basque Country (UPV/EHU) [EHUA12/19]
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In the present work, thermoplastic maize starch based bionanocomposites were prepared as transparent films, plasticized with 35% of glycerol and reinforced with both waxy starch (WSNC) and cellulose nanocrystals (CNC), previously extracted by acidic hydrolysis. The influence of the nanofiller content was evaluated at 1 wt.%, 2.5 wt.% and 5 wt.% of WSNC. The effect of adding the two different nanoparticles at 1 wt.% was also investigated. As determined by tensile measurements, mechanical properties were improved at any composition of WSNC. Water vapour permeance values maintained constant, whereas barrier properties to oxygen reduced in a 70%, indicating the effectiveness of hydrogen bonding at the interphase. The use of CNC or CNC and WSNC upgraded mechanical results, but no significant differences in barrier properties were obtained. A homogeneous distribution of the nanofillers was demonstrated by atomic force microscopy, and a shift of the two relaxation peaks to higher temperatures was detected by dynamic mechanical analysis. (C) 2014 Elsevier Ltd. All rights reserved.
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