The global shift toward environmental sustainability has accelerated the search for high-performance alternatives to petroleum-based structural materials. In a new study published in the journal Scientific Reports, author Abdelwaheb Hadou and an international research team explored the enhancement of bio-based epoxy resins using natural reinforcements. The researchers focused on combining fibers from the Dracaena draco plant, commonly known as the dragon tree, with biochar derived from the same botanical source. By integrating these waste-derived components, the team successfully developed a biocomposite that addresses the traditional weaknesses of natural materials, such as low thermal stability and limited mechanical load capacity. This research highlights a significant advancement in circular materials engineering, demonstrating how plant-based co-products can be repurposed into structural components for the automotive and construction sectors.

The primary discovery of the study is the dramatic quantitative improvement in mechanical performance when biochar is used as a secondary reinforcement. While adding thirty percent dragon tree fibers alone improved the material, the addition of small amounts of biochar provided a synergistic boost. The researchers found that a composite reinforced with thirty percent fibers and three percent biochar achieved a tensile strength of 107.95 megapascals. This represents a 135.7% increase compared to pure, unreinforced epoxy. Similarly, the flexural strength—a measure of the material’s resistance to bending—increased by 73.1% over the baseline epoxy. These findings position the hybrid material as a superior alternative to many existing biocomposites, as its strength values surpass several other natural fiber systems reported in scientific literature.

Thermal resistance also saw a measurable improvement through the inclusion of biochar. The study used thermogravimetric analysis to show that the biochar acts as an effective stabilizer by creating a protective barrier against heat. When the biochar concentration was increased to five percent, the residual carbon mass after high-temperature exposure rose from twelve percent to eighteen percent. The biochar particles delay the breakdown of the epoxy matrix and the plant fibers by inhibiting heat transfer and the release of volatile gases. This thermal shielding effect effectively shifts the degradation peaks to much higher temperatures, ensuring the material can maintain its structural integrity in environments where heat might otherwise cause standard bioplastics to fail.

A novel aspect of this research was the application of artificial intelligence to optimize the material’s composition. The team developed an artificial neural network to model the complex, non-linear relationships between the amounts of fiber and biochar and the resulting physical properties. The computer model was exceptionally accurate, with a correlation coefficient higher than zero point nine for most tested properties. This means the artificial intelligence could successfully predict tensile strength, stiffness, and heat resistance without the need for endless physical experiments. By identifying that the optimal performance threshold occurs at three percent biochar loading, the model proved that adding more filler does not always result in a better product. In fact, increasing biochar to five percent led to a slight decline in strength due to particles clumping together, a phenomenon known as agglomeration.

Microscopic analysis supported these findings, revealing how the biochar and fibers interact within the resin. Images from scanning electron microscopy showed that at the optimal three percent dosage, biochar particles were evenly distributed and acted as bridges between the fibers and the epoxy. This uniform dispersion is critical for efficient stress transfer, allowing the material to absorb more energy before breaking. In contrast, the unreinforced samples showed many voids and cracks where the fibers pulled away from the plastic. The study also noted that while biochar improves strength and heat resistance, it reduces the overall crystallinity of the material. This shift toward a more amorphous structure actually benefits the composite by allowing for better energy dissipation during impact.

The practical implications of these findings are significant for sustainable manufacturing. By using naturally fallen leaves from the dragon tree and converting them into both fibers and biochar, the researchers have created a closed-loop system for material production. The bio-based epoxy resin used in the study is partially derived from cashew nutshell liquid, further reducing the reliance on fossil fuels. This combination of renewable chemistry and waste-derived reinforcement offers a viable pathway for producing lightweight, durable parts that meet modern industrial standards. As artificial intelligence continues to refine the design process, these high-strength “green” composites are poised to play a central role in the next generation of sustainable architecture and vehicle design.

Source: Hadou, A., Belaadi, A., Boumaaza, M., Abdullah, M. M. S., Ghernaout, D., Bourmaud, A., & Mukalazi, H. (2026). Thermomechanical properties of bio-based epoxy biocomposites reinforced with Dracaena draco fibrils and biochar: performance optimization using artificial neural networks. Scientific Reports.