Obtenção e caracterização de um filme compósito a partir da incorporação de argila em blendas de amido/carboximetilcelulose

Abstract

This work aims at the obtainment and characterization of the physical and functional properties of a clay / starch / carboxymethylcellulose composite film. Starch is a polysaccharide that acts as an energy reserve of the vegetables, also finding application in the area of biodegradable films. Clay minerals have already been used in nanocomposites to obtain biosensors, in the regeneration of tissues, and in the packaging area as well. The clay to be used in this work comes from the Southwest region of the state of São Paulo and some physical chemical characterization of this clay in its in natura form have already been performed - Foster swelling, granulometry and rheological characterization. The films were prepared by casting from the conditions determined by the rheological and optical microscopy assays of the film-forming suspensions. The films were characterized for their thermal stability via DSC and TGA, tensile strength, water vapor permeability, moisture absorption, infrared vibration spectroscopy and water solubility. The addition of a percentage of 15% w/wstarch of clay in the films led to an improvement in its resistance to the water effect (moisture absorption, water vapor permeability and solubility), with no detriment to its thermal stability.