Hemp Shives Mycelium Composites - An Alternative Material for Traditionally Used Plastic Packaging

Abstract:

Plastic waste is an ever-growing concern, causing harm to many ecological and human health aspects, one of the major contributors to this problem being packaging. Mycelium composites (MC) are ecologically safe materials, well suited for the short-life usage as packaging materials. In our study we made MC using fine and coarse granulometry hemp shives applying them in 3 substrate variants – with added bran, with added bran and birch bark, and as the sole substrate. We assessed material's water absorption and mechanical properties, chemical decomposition, biodegradability, mold resistance and fungal biomass. Granulometric effect was observed only when using shives as the sole substrate, where larger particle size gave poorer results. Bran did not significantly improve mechanical properties or water uptake. Bark reduced water uptake by ~200 %, but lowered mechanical properties, and provided no benefits to mold resistance which was low for all specimens. Overall, hemp MC showed complete biodegradability after 12 weeks, mechanical properties up to 0,235 MPa, compatible with expanded polystyrene, but very high water uptake of up to 1000 %. Future studies are needed to reduce water absorption and improve mold resistance, as well as invent consensus methodology for better cross-study comparison.

• Periodical: Materials Science Forum (Volume 1071)
• Pages: 126-138
• DOI: https://doi.org/10.4028/p-yl4pa1
• Online since: October 2022
• Authors: Gustavs Daniels Loris*, Ilze Irbe, Marite Skute, Inese Filipova, Laura Andze, Anrijs Verovkins
• Keywords: Biodegradation, Birch Bark, Bran, Compression, Granulometry, Hemp Shives, Mold Resistance, Mycelium Composites, Trametes, Water Absorption

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