2025-11-112025-11-112025-09-22SANTOS, Michele Barbosa dos. Obtenção e caracterização de filmes de amido de milho e carboximetilcelulose reticulado em diferentes concentrações de ácido cítrico. Orientador: Marcos Vinicius da Silva Paula. 2025. 68 f. Trabalho de Curso (Bacharelado em Engenharia de Materiais) – Faculdade de Engenharia de Materiais, Campus Universitário de Ananindeua, Universidade Federal do Pará, Ananindeua, 2025. Disponível em: https://bdm.ufpa.br/handle/prefix/8804. Acesso em:.https://bdm.ufpa.br/handle/prefix/8804Conventional plastics, widely used in various sectors due to their low cost and versatility, present serious environmental impacts resulting from their petrochemical origin and slow natural degradation. In this context, the search for alternative materials aimed at minimizing such impacts has intensified. Among the most promising alternatives are starch-based films, which are environmentally sustainable. Therefore, this study focused on the production and characterization of corn starch/carboxymethylcellulose (CMC) films crosslinked with different concentrations of citric acid. The films were obtained by solvent casting, using 5%, 10%, 15%, and 20% citric acid relative to the CMC mass. They were qualitatively evaluated for visual aspects, swelling, moisture content, and solubility, and characterized by Fourier Transform Infrared Spectroscopy (FTIR), thickness measurement, and Scanning Electron Microscopy (SEM) to assess the crosslinking effect promoted by citric acid. Visually, all films exhibited excellent optical transparency. FTIR spectroscopy demonstrated the formation of ester groups, indicating the crosslinking of the films promoted by citric acid. The addition of citric acid reduced swelling and moisture absorption. These results are attributed to the crosslinking promoted by citric acid, which provided a more cohesive material and consequently satisfactory solubility results. SEM micrographs revealed a homogeneous and non-porous surface morphology in the films containing citric acid. Overall, the incorporation of citric acid into the polymeric matrix significantly reduced water susceptibility and increased film thickness, contributing to the development of more stable, cohesive films with improved performance.Acesso AbertoBiodegradávelAmido de milhoCarboximetilceluloseReticulaçãoBiodegradableCorn starchCarboxymethycelluloseCrosslinkingCNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA DE TRANSFORMACAO::TRATAMENTO TERMICOS, MECANICOS E QUIMICOSTrabalho de Curso - Graduação - MonografiaAttribution-NoDerivs 3.0 Brazil