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Effect of clays incorporation on properties of thermoplastic starch/clay composite bio-based polymer blends
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Effect of clays incorporation on properties of thermoplastic starch/clay composite bio-based polymer blends
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Journal Article
Effect of clays incorporation on properties of thermoplastic starch/clay composite bio-based polymer blends
2024
Overview
In this study, thermoplastic starch (TPS) biofilms were developed using starch isolated from the seeds of
Melicoccus bijugatus
(huaya) and reinforced with bentonite clays at concentrations of 1%, 3%, and 5% by weight. Novelty of this research lies in utilizing a non-conventional starch source and enhancing properties of TPS through clay reinforcement. FTIR analysis verified bentonite’s nature of clays, while SEM analysis provided insights into morphology and agglomeration behavior. Key findings include a notable increase in biofilm thickness and elastic modulus with higher clay content. Specifically, tensile strength of biofilms improved from 2.5 MPa for pure TPS to 5.0 MPa with 5% clay reinforcement. The elastic modulus increased from 25 MPa (TPS) to 60 MPa (5% clay). Thermal stability also showed enhancement, with initial degradation temperature increasing from 110 °C for pure TPS to 130 °C for TPS with 5% clay. Water vapor permeability (WVP) tests demonstrated a decrease in WVP values from 4.11 × 10
−10
g m
−1
s
−1
Pa
−1
for pure TPS to 2.09 × 10
−10
g m
−1
s
−1
·Pa
−1
for TPS with 5% clay, indicating a significant barrier effect due to clay dispersion. These results suggest that biofilms based on huaya starch and reinforced with bentonite clay have considerable potential for sustainable food packaging applications, offering enhanced mechanical and barrier properties.
