A Feasible Strategy to Construct Transparent, High-Strength, and Low-Permeability Starch Composite Films with Nano-SiO2

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Abstract The structures within the polysaccharide gel framework critically regulate the mechanical and barrier properties of starch-basedfilms. This study proposes a facile strategy to embed nano- SiO2 into industrial corn starch films during gelatinization and solidification, thereby realizing nano- SiO2-induced structural regulation of the starch matrix. The incorporation of nano-SiO2 significantly enhances mechanical and barrier properties by optimizing the internal microstructure and increasing the proportion of short-range ordered regions. As a result, the composite film exhibits remarkable enhancements in mechanical properties, with increases of 282.08% in tensile strength, 21.13% in elongation at break, 191.66% in Young’s modulus, and 409.87% in toughness compared to the control film. Barrier performance was simultaneously improved, with water vapor permeability and oxygen permeability reduced by 15.21% and 15.97%, respectively, while the water contact angle increased by 35.17%, indicating superior water resistance. Notably, the incorporation of nano-SiO2 had minimal impact on optical transparency. This work presents a robust and industrially viable route for fabricating high-performance starch-based materials through structural optimization.

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