Resumo

CUENCA, Pamela S.; RAMALLO, Laura A.  e  ALBANI, Oscar A.. Films and composites based on acetylated cassava starch of high degree of substitution. Rev. cienc. tecnol. [online]. 2020, n.33, pp.1-10. ISSN 1851-7587.

In this work, Cassava starch acetate (CSA) with a high degree of substitution films (DS = 2.9) and composite materials consisting of CSA resin supported on Kraft paper were developed. As a previous step, the synthesis of high degree acetate was carried out by using methylsulfonic acid as a catalyst. The characterization of the mechanical and barrier properties of the films obtained was performed. Acetylated cassava starch films were homogeneous and continuous, with plastic appearance, but brittle. The addition of 50% plasticizer allowed to obtain films with good mechanical properties (tensile strength at break 17,5 MPa and deformation 8,2%) but with storage, they became waxy and brittle. The films composed of Kraft paper -cassava starch acetate - have lower water vapor permeability values (up to 51%) than untreated papers, and their mechanical properties are better (tensile strength at break 33- 42 MPa and deformation 2 - 4%). Therefore, the development of biodegradable packages based on acetylated starch-cellulose materials seems a good option for the replacement of packages that are not environmentally compatible.

Palavras-chave : Cassava starch acetate; High degree of substitution; Free films; Composites..

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