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Effects of Humidity on Mycelium-Based Leather.

Ashoka Karunarathne1, Günel Nabiyeva1, Christopher J Rasmussen2

  • 1Otto H. York Department of Chemical and Materials Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102, United States.

ACS Applied Bio Materials
|October 9, 2024
PubMed
Summary
This summary is machine-generated.

This study explores how humidity affects mycelium-based leather, a sustainable alternative to animal leather. Results show water absorption reduces elastic properties, offering insights for durable bio-based material development.

Keywords:
biobased leatherelasticityplasticizationultrasonic testingwater sorption

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Sustainable Product Development

Background:

  • Traditional leather production poses environmental and ethical challenges.
  • Mycelium-based materials are emerging as sustainable bio-based alternatives to animal leather.
  • Understanding material response to environmental factors like humidity is crucial for product durability.

Purpose of the Study:

  • To investigate the impact of humidity on the water sorption and elastic properties of mycelium-based leather.
  • To provide data essential for developing durable and competitive sustainable leather products.
  • To correlate changes in mechanical properties with water absorption levels.

Main Methods:

  • Water sorption isotherms were measured on mycelium-based leather samples.
  • Ultrasonic pulse transmission was used to determine wave speed at various humidity levels.
  • Uniaxial tensile tests were conducted under ambient and immersed conditions to assess elastic moduli.

Main Results:

  • A general reduction in elastic moduli was observed with increasing water absorption and immersion.
  • Changes in the longitudinal modulus indicated significant alterations in material elasticity due to water sorption.
  • Irreversible variations in the longitudinal modulus during initial water sorption suggest influence from the production process and additives.

Conclusions:

  • Humidity significantly affects the elastic properties of mycelium-based leather, reducing its stiffness.
  • The observed irreversible changes highlight the importance of material processing and formulation for performance.
  • These findings are vital for material scientists engineering next-generation sustainable leather alternatives.