The Effects of Nano-SiO 2 on Mechanical, Barrier, and Moisture Sorption Isotherm Models of Novel Soluble Soybean Polysaccharide Films

In this research, a novel polysaccharide-based bionanocomposite film was prepared via dispersion casting method. Nano-silicon dioxide (SiO 2 -N) was incorporated into soluble soybean polysaccharide (SSPS) at different concentrations (i.e., 0%, 1%, 3%, and 5% w/w dried SSPS). Mechanical (tensile strength, elongation at break, and Young’s modulus), physical (moisture content, water solubility, and moisture uptake), and barrier properties of bionanocomposite films were evaluated. Incorporation of 5% SiO 2 -N to SSPS matrix decreased water vapor permeability (WVP) from 7.96×10 −11 to 4.75×10 −11 g m −1 s −1 Pa −1 and oxygen permeability from 215 to 96 cm 3 µm m −2 day −1 atm −1 . Heat seal strength and mechanical properties of SSPS films were improved. Moisture sorption isotherm of SSPS films supported by SiO2-N was shifted to lower moisture content, and monolayer moisture content of the films decreased significantly ( p <0.05). In summary, SiO 2 -N is a potential filler in SSPS-based films for packaging materials.