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High Performance Epoxy Composites Containing Nanofiller Modified by Plasma Bubbles.

Fei Kong1,2, Jingyi Yan2,3, Chuansheng Zhang2,4

  • 1State Key Laboratory of Advanced Power Transmission Technology, State Grid Smart Grid Research Institute Co. Ltd, Beijing, 102209, China.

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Summary
This summary is machine-generated.

Plasma modification of nano-aluminum oxide (Al2O3) fillers significantly enhances thermal conductivity in epoxy composites. This surface treatment reduces interfacial thermal resistance, improving electrical insulation performance for high-voltage applications.

Keywords:
Al2O3high thermal conductivitynanofillerplasma bubblessurface modification

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Area of Science:

  • Materials Science
  • Polymer Science
  • Electrical Engineering

Background:

  • High thermal conductivity is crucial for polymer insulation in high-voltage systems to prevent heat accumulation and failure.
  • Interfacial thermal resistance between fillers and polymers hinders effective thermal management.
  • Plasma technology offers a novel approach to modify nanofillers and reduce this resistance.

Purpose of the Study:

  • To reduce interfacial thermal resistance by modifying nano-aluminum oxide (nano-Al2O3) fillers using plasma technology.
  • To investigate the impact of plasma surface modification on the thermal conductivity and surface properties of nano-Al2O3.
  • To evaluate the enhancement in surface insulation performance of the modified polymer composites.

Main Methods:

  • Surface modification of nano-Al2O3 using plasma bubbles under Ar, Ar+O2, and air atmospheres with a coupling agent.
  • Characterization of surface grafting using Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM).
  • Investigation of modification mechanisms, thermal conductivity, and reaction pathways.

Main Results:

  • Plasma modification significantly increased the thermal conductivity of polymer composites.
  • A 35% increase in thermal conductivity was observed for samples modified in an Ar+O2 atmosphere due to increased hydroxyl groups on the filler surface.
  • Surface insulation performance was enhanced by 14% attributed to changes in surface resistance and trap distribution.

Conclusions:

  • Plasma surface modification effectively reduces interfacial thermal resistance between nano-Al2O3 fillers and epoxy matrices.
  • The Ar+O2 plasma atmosphere is particularly effective in enhancing thermal and electrical insulation properties.
  • This approach provides a viable strategy for developing high-performance polymer composites for demanding electrical applications.