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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Green and Low-cost Production of Thermally Stable and Carboxylated Cellulose Nanocrystals and Nanofibrils Using Highly Recyclable Dicarboxylic Acids
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Environmentally Friendly, High-Performance Fire Retardant Made from Cellulose and Graphite.

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Summary

A novel exfoliated and reassembled graphite (ERG) coating, utilizing cellulose, effectively suppresses flames on wood and other materials. This innovative fire-retardant material achieves the highest flame resistance class for combustible substrates.

Keywords:
ERG (exfoliated and reassembled graphite)celluloseexfoliated graphitefire retardantsthermal conductivitywater-based paintwood protection

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Area of Science:

  • Materials Science
  • Fire Safety Engineering
  • Nanotechnology

Background:

  • Existing fire retardants face limitations, driving demand for novel solutions.
  • Cellulose's dispersant and adhesive properties offer potential for new material development.
  • Graphite's unique structure can be leveraged for advanced material applications.

Purpose of the Study:

  • To develop a new, effective fire-retardant coating using exfoliated and reassembled graphite (ERG) and cellulose.
  • To investigate the fire-retardant mechanism and performance of ERG on lignocellulosic materials.
  • To assess the technical advantages and potential industrial scalability of the ERG coating.

Main Methods:

  • Formation of ERG by drying aqueous dispersions of graphite and cellulose on substrates.
  • Application of ERG coatings on wood, canvas, and other lignocellulosic materials.
  • Evaluation of fire-retardant performance using visual observation, thermal imaging, temperature measurements, and standard flame resistance tests.

Main Results:

  • ERG coatings adhered well to various lignocellulosic substrates, significantly reducing flame damage.
  • Fast heat transfer away from flame spots was observed, suppressing flare formation.
  • Pinewood coated with ERG achieved the highest possible flame resistance class for combustible substrates.

Conclusions:

  • ERG demonstrates excellent fire-retardant properties due to its thermal stability and heat dissipation capabilities.
  • The ERG coating offers a novel mechanism for fire retardation with advantages like water-based precursors and commodity raw materials.
  • This technology presents a promising new class of flame-retardant coatings with potential for industrial application and minimal waste.