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Natural polymer-reinforced starch films: a study on mechanical properties and biodegradability
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DOI：10.1007/s13399-026-07239-y.png)
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Abstract
En 中文
Developing biodegradable polymer films from renewable resources has become a promising strategy for reducing plastic pollution while promoting the valorization of agricultural and food industry waste. In this study, potato starch-based biofilms (BS) were fabricated, and starch-based films were reinforced with natural polymers derived from organic waste, including partially hydrolyzed cellulose from banana peels (BSC), chitosan and chitin from shrimp shells (BSC1 and BSC2), and collagen from chicken feet (BSC3). The physical, chemical, mechanical, and morphological properties, as well as the chemical resistance and biodegradability of the fabricated films. FTIR analysis confirmed successful intermolecular interactions between the starch matrix and the reinforcing biopolymers, while SEM imaging revealed distinct morphological variations depending on the reinforcement type. Mechanical testing demonstrated that the cellulose-reinforced film (BSC) achieved the highest tensile strength of 8.23 ± 0.05 MPa, a significant improvement over the pure starch film (3.19 ± 0.34 MPa). The chitin-reinforced film (BSC2) exhibited the maximum elongation at break (85.0 ± 1.06%) and the lowest water absorption (58.0 ± 0.03%). Furthermore, the collagen-reinforced film (BSC3) displayed the thinnest profile (0.25 ± 0.02 mm) and superior chemical stability, retaining 70% and 90% resistance in H₂SO₄ and NaOH environments, respectively. Soil burial tests indicated high biodegradability, with degradation rates ranging from 75 to 90% after 30 days, peaking in the chitin-reinforced formulation. These results highlight the great potential of waste-derived biopolymers to enhance the functional properties of starch films, providing a sustainable and environmentally friendly alternative for industrial packaging applications.
Keywords:
Bioplastic
Natural polymers
Biodegradation
Properties
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