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Advanced Epoxy Resin/Boron Nitride Composites for High-Performance Electrotechnical Applications and Geological

Alina Ruxandra Caramitu1, Iustina Popescu2, Mihai Grigoroscuta3

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Adding cubic boron nitride (cBN) to epoxy composites enhances thermal conductivity. Processing method impacts mechanical and electrical properties, with higher cBN content leading to decreased strength but improved insulation.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Epoxy resins are versatile polymers with tunable properties.
  • Enhancing thermal conductivity in polymers is crucial for electronic and thermal management applications.
  • Boron nitride (BN) is a promising filler for improving thermal and electrical properties of composites.

Purpose of the Study:

  • To investigate the effect of cubic boron nitride (cBN) content on the thermal, mechanical, and electrical properties of epoxy composites.
  • To evaluate two different preparation methods for incorporating cBN into epoxy resins.
  • To understand the structure-property relationships in cBN-epoxy composites.

Main Methods:

  • Synthesizing epoxy composites with varying weight percentages (0-50 wt.%) of cBN.
  • Employing two distinct preparation methods involving different mixing sequences of cBN, resin base, and hardener.
  • Characterizing thermal conductivity, bending strength, bending strain, electrical conductivity, dielectric constant, and dielectric loss tangent.

Main Results:

  • Thermal conductivity increased with cBN content, reaching 1.5 W/mK at 50 wt.% cBN.
  • Bending strength and strain decreased with increasing cBN content, with method (b) showing lower values.
  • Electrical conductivity, dielectric constant, and loss tangent decreased with higher cBN loading, with a partial recovery to an insulating state observed at >= 30 wt.% cBN.

Conclusions:

  • Cubic boron nitride effectively enhances the thermal conductivity of epoxy composites.
  • The preparation method significantly influences the mechanical and electrical properties of the composites.
  • cBN addition can be tailored to achieve desired thermal and electrical insulation characteristics in epoxy systems.