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Improving Interfacial Adhesion of Graphite/Epoxy Composites by Surface Functionalization.

Dongmei Yao1, Cong Feng2, Liming Jin1

  • 1Clean Energy Automotive Engineering Center and School of Automotive Studies, Tongji University, 4800 Caoan Road, Shanghai 201804, China.

ACS Applied Materials & Interfaces
|August 7, 2023
PubMed
Summary
This summary is machine-generated.

Functionalizing graphite surfaces enhances bonding with epoxy resin in composites. This improves interface thickness and mechanical strength for fuel cell bipolar plates.

Keywords:
G/EP interface adhesionfuel cell composite bipolar platesinterfacial structuremolecular dynamicssurface functionalization of graphite

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Graphite/epoxy resin (G/EP) composites are key for fuel cell bipolar plates due to excellent electrical and mechanical properties.
  • A major limitation is reduced mechanical strength caused by poor interfacial adhesion between graphite and epoxy resin.

Purpose of the Study:

  • To investigate how graphite surface functionalization impacts the interfacial structure and properties of G/EP composites.
  • To understand the microscopic mechanisms governing interface formation and bonding.

Main Methods:

  • Utilized molecular dynamics (MD) simulations to model and analyze graphite-epoxy interfaces.
  • Examined the effects of different functional groups on graphite surfaces.

Main Results:

  • Graphite surface functionalization increased composite interface thickness.
  • Observed enhanced interdiffusion and hydrogen bond formation between functionalized graphite and epoxy chains.
  • All tested functional groups promoted adsorption, significantly improving graphite-epoxy adhesion.

Conclusions:

  • Surface functionalization is an effective strategy to improve interfacial bonding in G/EP composites.
  • Enhanced interfacial adhesion leads to increased mechanical strength, crucial for fuel cell applications.
  • Findings offer guidance for designing advanced composite bipolar plates.