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Comparative Evaluation of Mechanical and Physical Properties of Mycelium Composite Boards Made from Lentinus sajor-caju with Various Ratios of Corn Husk and Sawdust

Summary

Researchers developed biodegradable composite boards using mushroom mycelium (Lentinus sajor-caju) grown on agricultural waste like corn husks and sawdust. By adjusting the ratio of these materials and board thickness, they created boards with properties comparable to commercial softboards and acoustic panels. These eco-friendly boards could replace synthetic materials in construction and furniture, reducing waste and pollution while maintaining good mechanical strength and sound absorption properties.

Background

Mycelium-based composites (MBCs) represent a promising biodegradable alternative to synthetic materials in construction, furniture, and packaging industries. Current lignocellulose-based composites rely on formaldehyde-based resins that emit harmful carcinogens, prompting research into natural adhesive alternatives using fungal mycelium as a sustainable solution.

Objective

To investigate the mechanical and physical properties of mycelium composite boards (MCBs) produced from Lentinus sajor-caju using different ratios of sawdust to corn husk at varying thicknesses (8, 16, and 24 mm) to determine optimal substrate combinations for commercial manufacturing.

Results

Reducing corn husk content increased modulus of elasticity, density, and thermal conductivity, while increasing corn husk content enhanced bending strength, shrinkage, water absorption, and volumetric swelling. MCBs exhibited sound absorption of 61-94% at 1000 Hz, with optimal properties comparable to commercial softboards and acoustic boards at specific substrate ratios.

Conclusion

Substrate ratio and thickness significantly influence MCB properties, with MCBs made from 100% corn husk showing properties most similar to commercial softboards and acoustic boards. These findings provide guidance for optimizing MCB production for commercial manufacturing while promoting sustainable recycling of lignocellulosic waste.
  • Published in:Journal of Fungi (Basel),
  • Study Type:Experimental Study,
  • Source: PMID: 39330394
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