Development of a Sustainable Composite Material Based on Rice Husk and Polystyrene

The combination of rice husk and expanded polystyrene for the fabrication of sustainable composites is a direction that is not well-explored in scientific literature. In this context, this research focuses on the feasibility and physical properties of composites developed from these materials. The methodology encompasses a mechanical grinding process of rice husks, dissolution of polystyrene in an organic solvent to form a binder, and the fabrication of composites through cold compaction. The fabricated composites were analyzed for their physical properties, particularly density, mass loss after compaction and air storage, and their swelling upon immersion. Fine-grained composites record a higher mass loss (13.17% for MF1 and 12.48% for MF2) compared to coarse-grained ones (8.43% for MG1 and 7.34% for MG2). This difference is attributed to a larger specific surface area of the fine particles, facilitating the evaporation of volatile compounds. Swelling after immersion is also influenced by granularity, with a maximum swelling of 15.53% for MG2 versus only 0.72% for MF2. These observations highlight the key role of the rice husk particle size and binder dosage in determining the properties of the composites. This work highlights the potential of these composites as both an ecological and practical solution for waste valorization while paving the way for future investigations, notably regarding their mechanical properties.