Publication

Investigation of mycelium film as the adhesive for poplar veneer bonding: insight into interfacial bonding mechanisms

Wenjing Sun
2024
Journal paper
Abstract

The emergence of mycelium-bonded biocomposites has been stimulated in the quest for sustainable development. These biocomposites exhibit enhanced mechanical properties through hot pressing, with mycelium playing a crucial role as both the adhesive and reinforcing material in this composite system. This study aims to investigate and compare the effectiveness of different mycelium films for veneer bonding, with a specific focus on the interface between the mycelia and the substrate. Two fungal species, Pycnoporus sanguineus and Trametes versicolor, were utilized to colonize poplar veneers for 14 days. Subsequently, a wood bonding interface was successfully established between the mycelium film and the decayed veneer surface. The results revealed that bonded veneers with the mycelium film of Pycnoporus sanguineus exhibited higher adhesion strength with 1.76 +/- 0.16 MPa. A series of analyses have revealed the occurrence of both mechanical and chemical bonds between mycelia and wood. The bonding interface between mycelium and wood was formed by a synergistic combination of mechanical interlocking, hydrogen bonding interaction, Schiff base reaction, and lignin repolymerization. This study provides valuable insights into the underlying mechanisms involved in the formation of interfacial bonding by fungal mycelia.

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Related concepts (32)
Veneer (dentistry)
In dentistry, a veneer is a layer of material placed over a tooth. Veneers can improve the aesthetics of a smile and protect the tooth's surface from damage. There are two main types of material used to fabricate a veneer: composite and dental porcelain. A composite veneer may be directly placed (built-up in the mouth), or indirectly fabricated by a dental technician in a dental lab, and later bonded to the tooth, typically using a resin cement.
Mycelium
Mycelium (: mycelia) is a root-like structure of a fungus consisting of a mass of branching, thread-like hyphae. Fungal colonies composed of mycelium are found in and on soil and many other substrates. A typical single spore germinates into a monokaryotic mycelium, which cannot reproduce sexually; when two compatible monokaryotic mycelia join and form a dikaryotic mycelium, that mycelium may form fruiting bodies such as mushrooms. A mycelium may be minute, forming a colony that is too small to see, or may grow to span thousands of acres as in Armillaria.
Fungus
A fungus (: fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from the other eukaryotic kingdoms, which, by one traditional classification, includes Plantae, Animalia, Protozoa, and Chromista. A characteristic that places fungi in a different kingdom from plants, bacteria, and some protists is chitin in their cell walls.
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