The Effects of the Octenyl Succinate Cassava Starch Ester (OSCS)/Chitosan Mass Ratio on the Properties of OSCS-Chitosan-ZnO Composite Films
Article
Figures
Metrics
Preview PDF
Reference
Related
Cited by
Materials
Abstract:
Octenyl succinate cassava starch ester (OSCS)-chitosan-ZnO composite films were prepared using OSCS and chitosan as the film-forming matrix, glycerol as the plasticizer, and ZnO nanoparticles (nano-ZnO) as the reinforcing agent. The effects of the OSCS/chitosan mass ratio on the mechanical performance, water absorption rate, water vapor permeability (WVP), and opacity of the composite film were then analyzed. First, cassava starch was extracted via the petroleum ether degreasing and alkaline extraction processes, and the extracted cassava starch was then modified into OSCS. Following homogeneous blending of the gelatinized OSCS solution with a chitosan solution and ZnO nanoparticles, ultrasonic degassing, and oven drying, an OSCS-chitosan-ZnO film was created. An OSCS/chitosan mass ratio of 1:1 was found to be optimal for mechanical performance, as the resulting film had a tensile strength of 13.85 MPa and an elongation-at-break of 46.57%. As the OSCS/chitosan mass ratio increased, the water absorption rate and WVP increased, while opacity initially decreased and then increased. Opacity reached a minimum of 1.56 A/mm when the OSCS/chitosan mass ratio was 1.5:1. Infrared spectroscopy of films with different OSCS/chitosan mass ratios, revealed that the films were simple physical blends, because altering the mass ratio did not result in the formation of new chemical bonds. Furthermore, an OSCS/chitosan mass ratio of 1:1 optimized thermal performance, as it yielded the highest glass transition temperature of 102.03 ℃. In summary, the optimal OSCS/chitosan mass ratio is 1:1, as this provides the best overall performance. These findings will hopefully act as an emperical foundation for the formulation of OSCS-polysaccharide films.
