Browsing by Author "Criollo Guevara, Heidy Tatiana"
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Item Obtención y caracterización de película a partir de almidón reforzado con nanoarcillas(Universidad Santiago de Cali, 2024) Criollo Guevara, Heidy Tatiana; Ocoró Caicedo, Lis Vanesa; Ríos Acevedo, Jhon Jairo (Director); Guancha Chalapud, Marcelo Alexander (Director)The growing concern about the environmental impact of conventional plastics has driven the need to develop biodegradable packaging materials. In this context, natural polymers, such as starch, emerge as sustainable alternatives. Commercial montmorillonite used as a reinforcing nanomaterial allows to improve the properties of biodegradable materials. In this study, commercial cassava starch was used, plasticized with water and 35% glycerol, and reinforced with 2% and 4% commercial clay to obtain films. The manufacturing process included the extrusion technique, which allowed to evaluate the effectiveness of the reinforcement in improving the mechanical and functional characteristics of the films produced. Three films were developed from commercial cassava starch, the optimal concentration of different glycerol concentrations for processing was determined, evaluating the thermal and rheological properties. These films were subjected to a thorough analysis using international standard techniques, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR) and morphological analysis using scanning electron microscopy (SEM). Among the aspects evaluated was water vapor permeability (WVTR), determined using the ASTM F1249-20 method. The results showed that a higher clay content in the films favored moisture retention, which in turn increased their barrier property. As for the results obtained from the mechanical tests under ASTM D882 and ASTM D1922, the film with the highest percentage of clay P-NA- 4% obtained tensile strength values of 0.23 ± 0.02 MPa and 66.90 ± 4.85 % deformation while P and P-NA- 2% obtained lower values with respect to the properties evaluated, the same was observed in the determination of the contact and tear angle with values 89.93 ° ± 8.78 of 0.740 kg ± 0.009 kg and respectively, finally a film with very good water vapor barrier of 0.003 g / m2.day ± 0.011 was obtained.