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espanolEn este trabajo se desarrollaron peliculas de acetato de almidon de mandioca (AAM) de alto grado de sustitucion (DS = 2,9) y materiales compuestos consistentes de la resina AAM soportada en papel Kraft. Como un paso previo, la sintesis del acetato de alto grado fue llevada a cabo empleando acido metilsulfonico como catalizador. Se realizo la caracterizacion de las propiedades mecanicas y de barrera de las peliculas obtenidas. Las peliculas de almidon de mandioca acetilado resultaron homogeneas y continuas, de apariencia plastica, pero fragiles. El agregado de 50% de plastificante permitio obtener peliculas con buenas propiedades mecanicas (tension de rotura 17,5 MPa y deformacion de rotura de 8,2 %) pero que, con el almacenamiento, se volvieron cerosas y fragiles. Las peliculas compuestas de papel Kraft - acetato de almidon de mandioca tienen valores de permeabilidad al vapor de agua menores (hasta el 51%) que los papeles sin tratar, a la vez que sus propiedades mecanicas son mejores (traccion de rotura 33 - 42 MPa y elongacion 2 - 4%). Por lo tanto, el desarrollo de envases biodegradables basados en materiales de almidon acetilado - celulosa parece una buena opcion para el reemplazo de envases que no son ambientalmente compatibles. EnglishIn 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.

Películas y materiales compuestos basados en almidón de mandioca acetilado de alto grado de sustitución