Estudio de materiales termoplásticos obtenidos a partir de copoliéster alifático-aromático y almidón de banano (Musa paradisiaca)

Abstract

The present investigation focused on copolyester aliphatic-aromatic, banana starch (Musa paradisiaca) and glycerol blends. The experimental methodology was based on design of mixtures using software Statgraphics Centurion 16, with different components proportions: copolyester aliphatic-aromatic (66% to 78%w/w), starch (12% to 30% w/w) and glycerol (4% to 16% w/w). Additionally, citric acid was used as compatibilizer agent in a proportion of 1% w/w in each formulation. Blending was carried out in a mixer chamber at 120°C, 90 rpm for 8 minutes. Subsequently, films were obtained by compression molding at 120°C. Mechanical evaluation was conducted by tensile strain test according to ASTM D882-12 standard and the thermic behavior was evaluated by differential scanning calorimetry DSC and thermogravimetric analysis TGA, according to ASTM D3418-15 and ASTM E1131 respectively. The contour and surface graphs determine that the Young's modulus is proportional to the amount of glycerol, while the tensile strength and elongation at break are influenced by the amount of copolyester. In addition, the thermal analysis was reported a glass transition temperature and an endothermic process in the blends.