Affiliation:
1. Instituto de Química, Universidade Federal de Uberlândia, Campus Santa Mônica, Avenida João Naves de Ávila 2121, 38400-902 Uberlândia, MG, Brazil
Abstract
The effect of incorporating cellulose nanocrystals from corncob (CNC) on the tensile, thermal, and barrier properties of poly(vinyl alcohol) (PVA) nanocomposites was evaluated. The CNC were prepared by sulfuric acid hydrolysis at 45°C for 60 minutes, using 15 mL of H2SO4(9.17 M) for each gram of fiber. The CNC60presented a needle-shaped morphology, high crystallinity (83.7%), good initial degradation temperature (236°C), average length (L) of210.8±44.2 nm, diameter (D) of4.15±1.08 nm, and high aspect ratio (L/D) of53.4±15.8. PVA/CNC nanocomposite films with different filler loading levels (3, 6, and 9% by wt) were prepared by casting. The ultimate tensile strength (UTS), thermal stability (TS), light transmittance (Tr) and water vapor permeability (Pw) of the nanocomposites were measured. When compared to neat PVA film, the UTS of the nanocomposites improved significantly, by 140.2%,Pwdecreased up to 28.73%, and there were no significant changes in TS. The nanocomposites also showed excellent Tr in the visible region, maintaining substantially equivalent transparency. These improvements in the nanocomposites' properties suggest a close association between filler and matrix, besides indicating that the CNC were well dispersed and adherent to the polymer matrix.
Funder
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Subject
General Materials Science
Cited by
46 articles.
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