Facultad de Ciencias Básicas
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Browsing Facultad de Ciencias Básicas by Author "Adames Paredes, Yicel Dayana"
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Item Evaluación físico-mecánica de nanocompuestos base de arcillas catiónicas contenidas en almidón termoplástico (TPS)(Universidad Santiago de Cali, 2021) Adames Paredes, Yicel Dayana; Caicedo Cano, Carolina (Directora); Calambás, Heidy Lorena (Codirectora)The objective of this work was to produce films of polymeric bionanocomposites based on thermoplastic starch / polyvinyl alcohol (PVA) and nanoclays in order to evaluate the influence on the physicomechanical properties by adding different proportions of nanoclays in the presence of ultrasound and their respective targets. Biofilms were prepared using the solvent-casting method and characterized by infrared spectroscopy (FTIR), thermogravimetric analysis, mechanical analysis, contact angle and scanning electron microscopy. In the FTIR spectra, characteristic bands of the mixture of thermoplastic starch and polyvinyl alcohol (SP / PVA) and functional groups that show the interaction with nanoclays were observed. An improvement in the thermal stability of the starch was also observed with the incorporation of clay by thermogravimetric analysis (TGA), and an increase in the gelatinization temperatures of the biofilms was evidenced in differential scanning calorimetry (DSC). The results of the stress analysis showed increases in the values of maximum resistance and Young's modulus for the sample SP-1.0-NC-S, due to the reinforcing effect generated by the nanoclay on the mechanical properties of the biofilms. Surface analysis related to wettability, using the sessile drop technique, showed a proportional increase in the contact angle values with the nanoclay content. This shows a decrease in the hydrophilicity of biofilms against water. The morphological properties were characterized by Differential Scanning Microscopy (SEM), confirming a good dispersion of the nanoclay on the biopolymer matrix (SP / PVA) due to the influence of ultrasound. These results demonstrate that nanoclays are promising nanofillers to improve the properties of TPS / PVA-based blends, and constitute a new green material for potential application in the packaging sector.