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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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The addition of silica (SiO2) to Styrene Butadiene Rubber (SBR) and EPDM composites enhances electrical insulation properties. Silica modifies dielectric behavior, reducing polarization effects and making the compounds less conductive.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Electrical Engineering

Background:

  • Styrene Butadiene Rubber (SBR) and Ethylene Propylene Diene Monomer (EPDMd) are widely used polymers.
  • Understanding their thermal-dielectric behavior is crucial for advanced applications.
  • The role of fillers like silicon dioxide (SiO2) in polymer composites needs further investigation.

Purpose of the Study:

  • To analyze the structure and thermal-dielectric properties of SBR and SBR/EPDMd composites containing SiO2.
  • To investigate the influence of varying EPDMd concentrations and SiO2 content on material behavior.
  • To evaluate the potential of these composites as electrical insulation materials.

Main Methods:

  • Characterization of DC-AC conductive behavior in the composites.
  • Analysis of dielectric properties, including permittivity and electrical modulus.
  • Observation of polarization phenomena through imaginary modulus peaks.

Main Results:

  • Distinct DC and AC conductivity regimes were observed, with different dielectric behaviors at low and high frequencies.
  • SiO2 incorporation did not significantly alter conductivity but impacted permittivity and electrical modulus, affecting energy storage.
  • Silica modified dielectric behavior, reducing polarization effects and increasing the insulating properties of the compounds.

Conclusions:

  • The incorporation of SiO2 into SBR/EPDMd composites significantly alters their dielectric behavior, enhancing energy storage capacity.
  • SiO2 addition results in more insulating (less conductive) materials, suggesting their suitability for electrical insulation applications.
  • The study highlights the potential of SiO2-filled SBR/EPDMd composites for specialized electrical insulation needs.