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    Effect of carboxymethyl cellulose concentration on mechanical and water vapor barrier properties of corn starch films

    Year: 2020

    Journal: Carbohydr. Polym., Volume 246, OCT 15

    Authors: Tavares, Katiany Mansur; de Campos, Adriana; Luchesi, Bruno Ribeiro; Resende, Ana Angelica; de Oliveira, Juliano Elvis; Marconcini, Jose Manoel

    Organizations: Agronano Network; Embrapa Instrumentacao (Sao Carlos, Sao Paulo)Empresa Brasileira de Pesquisa Agropecuaria (EMBRAPA); National Council for Scientific and Technological Development (CNPq)Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ); Sao Paulo State Research Support Fund (FAPESP); Graduation Personnel Improvement Coordination (CAPES)Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)

    Keywords: Polymer blends; Biodegradable film; Packaging; Tensile strength; Thermal stability; Water vapor permeability

    The main objective of this study was to evaluate the effect of the addition of different concentrations of CMC (0, 20, 40, 60, 80 and 100 %) on the mechanical and water vapor barrier properties in corn starch films produced by casting. The addition of CMC 40 % was sufficient to significantly increase its mechanical properties (tensile strength, elongation at break and elastic modulus), and water vapor barrier of the starch films, thus improving its functionality as a packaging material for food. CMC incorporation led to a small reduction in the thermal stability of the films. CMC in low content dispersed well in the starch matrix, ensuring interaction between its constituents that formed a network structure, thus improving mechanical properties and making diffusion of water difficult.
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