Browsing by Author "Siachoque Meza, Laura Vanessa"
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Item Obtención y caracterización de mezclas de almidón termoplástico funcionalizado y ácido poliláctico con potencial aplicación en empaques flexibles(Universidad Santiago de Cali, 2021) Siachoque Meza, Laura Vanessa; Caicedo Cano, Carolina (Directora); Calambás Pulgarín, Heidy Lorena (Codirectora)The physico-mechanical properties of the mixture of thermoplastic starch and polylactic acid and its interaction with organic acids such as: oleic acid, lactic acid and acetic acid were determined. These biopolymers were obtained in the molten state in which TPS: PLA 70:30 ratios were used, for the plasticization of the starch a 70:30 ratio (starch: plasticizer) was used, and the acidic agents were added in mixtures, but in a total portion of 6%. These mixtures were obtained in a torque rheometer at a speed of 50 rpm, for 10 min at 150 ° C. Polylactic acid was able to effectively promote the gelatinization process by decreasing the available polar sites towards the surface of the material; As a result, there were higher values in the contact angle, these results were contrasted with the analysis performed by differential scanning calorimetry and scanning electron microscopy. The results derived from the rheological analysis show that there was an increase in the elastic component in thermoplastic starch with the presence of acids; this behavior favored gelatinization. The mixture of sorbitol with polylactic acid promoted lower values of the loss modulus, the storage modulus, and the complex viscosity, which means a lower residual energy in the transition from the viscous state to the elastic state; this allows the compounds to be scaled to the conventional polymer used in transformation processes.