Fungal Mycelium/Sawdust Composite Material Biological Molding And Performance

In recent years, Biomass composite material has been gradually become the inevitable trend of development of composite materials. The study of the preparation of environment-friendly biological composites has received great attention of scholars at home and abroad.In this paper, preparing the Fungal Mycelium/Sawdust composite material using biological forming process with the broadleaf sawdust as main substrate and mycelium as bonding material. According to the production experience of edible fungi and the biological characteristics of fungal mycelium, confirming the fungi strains of the test were:pleurotus ostreatus mycelium,Pholiota nameko mycelium and Lentinus edodes mycelium. The matrix material is:broadleaf sawdust(poplar, birch) and bran, ect. Then,study on the preparation process and process parameters of composite material. This study explores the influence of bacterial species, density and thickness of composite materials on the properties of the composite materials. The results are as follows:(1) Fungal Mycelium/Sawdust composite material is mainly composed of broadleaf sawdust, wheat bran and fungal mycelium, the broadleaf sawdust, wheat bran is as raw material. Fungal mycelium can be regarded as a kind of renewable and innocuous green "adhesive". Composite material are not harm to the environment and human body no matter in the process of reparation or use, the waste can be completely biodegradable. Composite material has porous structure, the density is about0.15～0.22g/cm3. In conclusion, the Fungal Mycelium/Sawdust composite material is a porous, light weighting and environment-friendly biomass composite material.(2) Macroscopic observation of the Fungal Mycelium/Sawdust composite material and the microstructure of the composites using microscope and SEM observation, we can found:A large number of fungal mycelium form space network structure in the process of growth and reproduction, mycelium adhere to wood cell structure by sticky sheath, and then wrap in wood surface, scattered sawdust will be effectively get together. FTIR analysis show that:the three kinds of fungal mycelium mainly degrade lignin in wood cell wall.(3) The paper compare and analysis the effects of two factors (species, density) on the fracture load and compression strength of Fungal Mycelium/Sawdust composite material through the orthogonal experiment, determining the optimum preparation process:, density is0.15g/cm3. Testing the performance of static compression of Lentinus edodes Mycelium/Sawdust composite material. Draw the stress-strain curve, comparison of EPS foamed plastic stress-strain curve show that:buffer performance of low density composite buffer performance is better than the density of0.02g/cm3EPS foam in strain0-50%. (4)The frequency of sound absorption coefficient curve of shows that it belongs to the characteristics of porous sound-absorbing material. The paper analysis the effect of two factors (density, thickness) on the composite sound absorption properties of Lentinus edodes Mycelium/Sawdust composite material through the orthogonal experiment. Determining the optimum condition:the density is0.15g/cm3, thickness is30mm. The influence of thickness significantly determine the properties of sound absorption of the composite materials.