Abstract
A biodegradable film was produced using different levels of Balangu seed gum (BG) with polyvinyl alcohol (PVOH) BG/PVOH: 100/0, 68/32, 50/50, and 32/68. PVOH decreased apparent viscosity; furthermore, the rheological properties of film-forming solutions manifested pseudoplastic behaviors. Among three different models, Herschel Bulkley was best fitted with the experimental data and the correlation coefficient was higher than 0.99 in all cases. PVOH significantly decreased thickness, moisture content, and water vapor permeability, while increased water solubility of composite films. Results of mechanical properties revealed that adding PVOH significantly decreased tensile strength; however, different portions of PVOH did not have a considerable effect on reducing the tensile strength. Besides, puncture strength decreased from 7.62 ± 1.56 to 2.27 ± 0.35 N, but increased elongation at break plus puncture deformation, respectively, from 13.1 ± 1.54 to 52.38 ± 2.6% and 4.2 ± 0.6–12.37 ± 1.19 mm. Finally, FTIR spectroscopy revealed improved mechanical properties of the composite films.
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