Improvement of polyvinyl alcohol properties by adding nanocrystalline cellulose isolated from banana pseudostems

  • Pereira A
  • Nascimento D
  • Souza Filho M
 et al. 
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Abstract

Cellulose nanocrystals (CNCs) isolated from banana pseudostems fibers (BPF) of the Pacovan variety were used as fillers in a polyvinyl alcohol (PVOH) matrix to yield a nanocomposite. The fibers from the external fractions of the BPF were alkaline bleached and hydrolyzed under acidic conditions (H2SO462% w/w, 70 min, 45 °C) to obtain CNCs with a length (L) of 135.0 ± 12.0 nm and a diameter (D) of 7.2 ± 1.9 nm to yield an aspect ratio (L/D) of 21.2. The CNCs were applied to PVOH films at different concentrations (0%, 1%, 3%, and 5% w/w, dry basis). With higher concentrations of CNCs, the water-vapor barrier of the films increased, while the optical properties changed very little. Increasing the concentration of the CNCs up to 3% significantly improved the mechanical properties of the nanocomposite. © 2014 Elsevier Ltd.

Author-supplied keywords

  • Agribusiness
  • Casting
  • Musa sp.
  • Nanocrystals
  • Nanotechnology
  • Packaging

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