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The adverse environmental effects of petroleum-based packaging plastics have necessitated the need for eco-friendly bioplastics. Most bioplastics are starch-based and are not without drawbacks, hence there is the need for their properties to be improved. In this study, the effect of varying concentrations of dialdehyde starch and silica solutions on the physical, mechanical, biodegradable, surface topology, and thermal properties of the bioplastic films was examined. The additive concentrations were varied from 60 to 100%. The bioplastic films produced with dialdehyde starch solution recorded better moisture content (6.62–11.85%), bioplastic film solubility (4.23–7.90%), and tensile strength (1.63–3.06 MPa), against (11.24–14.26%), (7.77–19.27%) and (0.53–0.73 MPa) respectively for bioplastic films produced with silica solution. The atomic force microscopy analysis; root-mean-square roughness, kurtosis, and skewness revealed better miscibility and compatibility between the starch matrix and the dialdehyde solution than between the starch matrix and the silica solution. Bioplastic with added dialdehyde starch solution has better tensile strength and long biodegradability than that with silica solution. The research has demonstrated that bioplastic film produced with starch and dialdehyde starch solution has better properties than the one produced with starch and silica solution. The properties evaluation results of the bioplastic films thus demonstrated their aptness for food packaging applications. Graphic abstract

Tafel extrapolation method has been employed to determine the corrosion resistance of super austenitic stainless steel (UNS S31254) in a CO 2-saturated acidizing oilfield environment. Green inhibitors (Tridax procumbens and Chromolaena odorata extracts) were employed for protection of the alloy in the environment. Over 90% inhibition efficiency was achieved at inhibition dosage of 100 ppm for one of the inhibitors. Results showed that both inhibitors are effective for protecting the alloy in the acidizing environment. The result of the adsorption isotherm showed that the adsorption of the extracts on the surface of UNS S31254 is a monolayer and consistent with the Langmuir isotherm.