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Related Experiment Video

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Experimental Implementation of a New Composite Fabrication Method: Exposing Bare Fibers on the Composite Surface by the Soft Layer Method
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Epoxy resin/carbon black composites below the percolation threshold.

J Macutkevic1, P Kuzhir, A Paddubskaya

  • 1Vilnius University (VU) 3 Universiteto St, LT-01513 Vilnius, Lithuania.

Journal of Nanoscience and Nanotechnology
|July 26, 2013
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This study investigated carbon black (CB) filled epoxy composites, finding that CB surface area influences dielectric properties. These findings can optimize antistatic paints and coatings for various temperatures.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Dielectric Spectroscopy

Background:

  • Epoxy resin composites are widely used in various applications.
  • Carbon black (CB) is a common filler used to modify composite properties.
  • Understanding the dielectric behavior of CB/epoxy composites is crucial for their application as antistatic materials.

Purpose of the Study:

  • To investigate the broadband dielectric spectroscopy of epoxy resin composites filled with different surface area carbon blacks (CBH and CBL).
  • To analyze the influence of carbon black surface area on the dielectric properties of epoxy composites below the percolation threshold.
  • To explore the potential of these composites for antistatic paints and coatings.

Main Methods:

  • Production of epoxy resin composites with varying weight percentages of ENSACO carbon black (0.25-2.0 wt.%).
  • Broadband dielectric spectroscopy measurements were performed across a wide temperature range (200 K to 450 K) and frequency range (20 Hz to 1 MHz).
  • Analysis of dielectric permittivity, electrical conductivity, and alpha relaxation in relation to carbon black type and temperature.

Main Results:

  • Dielectric properties below the percolation threshold are primarily governed by alpha relaxation of the polymer matrix.
  • The glass transition temperature of CB/epoxy composites decreased compared to neat epoxy resin due to increased free volume at the polymer-filler interface.
  • Epoxy composites with high surface area carbon black (CBH) exhibited higher dielectric permittivity at room temperature, while those with low surface area carbon black (CBL) showed higher electrical conductivity at high temperatures.

Conclusions:

  • The surface area of carbon black significantly impacts the broadband dielectric characteristics of epoxy composites.
  • These findings provide a basis for designing effective, low-cost antistatic paints and coatings tailored for specific operating temperatures.
  • The study highlights the tunable nature of CB/epoxy composites for advanced material applications.