Química
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Browsing Química by Subject "Absorción de agua"
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Item Obtención de biopelículas de almidón de yuca mejoradas con óxido de titanio e indicadores naturales(Universidad Santiago de Cali, 2025-12-03) Camacho Piedrahita, Alexis; Vivas Arango, Nicolas; Castro Narváez, Sandra Patricia (Directora)The increase in petroleum-based plastic waste is causing an environmental pollution crisis that affects aquatic and terrestrial ecosystems, making it necessary to search for new economical, safe, and sustainable alternatives for bag-type packaging applications that reduce the carbon footprint. This work presents the development of cassava starch bioplastics reinforced with titanium dioxide, cellulosic polymers, and plasticizers, incorporating anthocyanins and curcumin as pH indicators. They were produced by casting and characterized by mechanical testing, FTIR with KBr and HATR, and thermal analysis (DSC/TGA). The results showed an increase in tensile strength from 7.0N/cm² (PC3) to 17.0 N/cm² (2A), a value close to that of high-density polyethylene (20–30 N/cm²). Water absorption varied between 7.52% and 24.8%, compared to <0.01% for HDPE, confirming the hydrophilic nature of starch. The FTIR spectra showed polysaccharide bands (O–H 3400 cm⁻¹, C–O–C 1020 cm⁻¹) and Ti–O signals (500–700cm⁻¹), confirming the incorporation of TiO₂.Thermal analyses showed stability up to 200 °C and degradation between 201–334 °C. Finally, the films showed color changes from pH 1 to 13, validating their application in smart active packaging.