Enhancement of thermal stability, UV barrier, biodegradability, and moisture resistance of potato starch–agar bioplastics using biogenic TiO2 nanoparticles

Enhancement of thermal stability, UV barrier, biodegradability, and moisture resistance of potato starch–agar bioplastics using biogenic TiO2 nanoparticles

This study evaluated the influence of biogenically synthesized TiO2 nanoparticles (NPs) on the structure, properties, and biodegradability of bioplastics made from potato starch and agar. TiO2 NPs (13.41 ± 1.0 nm, crystalline structure confirmed by X-ray diffraction) were incorporated at 0.674 %, 0....

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Bibliographic Details
Main Authors: David Asmat-Campos, Meliza Lindsay Rojas, Angel Carreño-Ortega, Noemi Raquel-Checca
Format: Article
Language:English
Published: Elsevier 2025-08-01
Series:Polymer Testing
Subjects:
Biofilms
Biopolymers
TiO2 nanoparticles
Bioplastics
Online Access:http://www.sciencedirect.com/science/article/pii/S0142941825001825
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Summary:This study evaluated the influence of biogenically synthesized TiO2 nanoparticles (NPs) on the structure, properties, and biodegradability of bioplastics made from potato starch and agar. TiO2 NPs (13.41 ± 1.0 nm, crystalline structure confirmed by X-ray diffraction) were incorporated at 0.674 %, 0.506 %, and 0.434 % concentrations. EDS and X-ray fluorescence confirmed their presence in the bioplastic matrix, while FTIR and Raman spectroscopy revealed interactions with polymer functional groups. TiO2 addition reduced transparency from 79.1 % (control) to 46.81 % and improved UV-blocking capacity (68.7 % UV-A, 79.1 % UV-B). Water absorption decreased, indicating lower moisture affinity. Thermally, the 0.506 % NP sample showed superior stability with a decomposition temperature of 318.52 °C. Tensile strength decreased from 7.459 MPa (control) to 4.873 MPa, likely due to NP distribution and agglomeration. Biodegradability tests showed 52–60 % degradation in seawater (15 days) and over 76 % in soil (28 days), with the 0.506 % NP sample reaching the highest degradation (79.7 %). These findings highlight TiO2 NPs’ potential to enhance thermal stability, UV protection, moisture resistance, and biodegradability in sustainable bioplastics.
ISSN:1873-2348

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