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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

ZANELA, Juliano et al. Sheets of cassava starch - poly (vinyl alcohol) produced by extrusion: effect of formulation on the color and opacity. Polímeros [online]. 2015, vol.25, n.3, pp.326-329. ISSN 1678-5169.  https://doi.org/10.1590/0104-1428.1468.

Twelve sheets were produced by extrusion with different proportions of cassava starch, poly (vinyl alcohol) (PVA) and glycerol using a mixture design. The opacity of the materials ranged from 31 to 56%, and the concentration of PVA and the interaction between starch and PVA concentrations the mainly responsible for increasing opacity. The color difference (ΔE*) ranged from 20 to 30, the concentration of starch being primarily responsible for increasing in color difference by promoting a more yellowish color in sheets.

Palavras-chave : extrusion; biopolymers; optical properties.

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