Development of waste rice husk/PVC/GO nanocomposite using TA–CaO adduct and ESO as green additives

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Abstract

In this study, a biobased composite utilizing waste rice husk ash (RHA) and polyvinyl chloride in a 1:1 ratio was prepared. The composites were prepared in a solventless, green pathway of melt blending using green additives such as tannic acid-calcium oxide (TA–CaO) adduct as a heat stabilizer and epoxidized soybean oil (ESO) as green compatibilizer. The addition of graphene oxide (GO) nanomaterial into the composite improved the thermal, mechanical, chemical and flame resistance properties of the composite. Composite reinforced with 0.5 phr GO, improved the tensile, flexural and, shore D hardness by 34, 37, 14%, respectively. The homogeneous dispersion of the GO layer in reinforced composite was evident from the transmission electron microscopy (TEM) study. Composites with GO as nano reinforcement showed relatively higher flame retardancy due to the synergistic effect of GO and silicon present in RHA. The composite with 0.5 phr loading of GO showed overall improvement in properties among the composites. It is expected that the incorporation of waste RHA along with other renewable bioresource materials will improve biodegradability and decrease the production cost of the composite.

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Biodegradation of bioplastics in natural environments.

S Mehdi Emadian, Turgut T Onay, Burak Demirel (2017)

The extensive production of conventional plastics and their use in different commercial applications poses a significant threat to both the fossil fuels sources and the environment. Alternatives called bioplastics evolved during development of renewable resources. Utilizing renewable resources like agricultural wastes (instead of petroleum sources) and their biodegradability in different environments enabled these polymers to be more easily acceptable than the conventional plastics. The biodegradability of bioplastics is highly affected by their physical and chemical structure. On the other hand, the environment in which they are located, plays a crucial role in their biodegradation. This review highlights the recent findings attributed to the biodegradation of bioplastics in various environments, environmental conditions, degree of biodegradation, including the identified bioplastic-degrading microorganisms from different microbial communities.