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Study on Nonlinear Conductivity of CCTO/EPDM Rubber Composites.

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Polymer composites with calcium copper titanate (CCTO) and ethylene propylene diene monomer (EPDM) exhibit nonlinear conductivity, improving electrical field homogenization in cable accessories. Optimal CCTO content enhances these properties for practical applications.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Polymer Science

Background:

  • Nonuniform electrical fields in cable accessory insulation necessitate materials with tunable electrical properties.
  • Polymer composites offer a versatile platform for developing advanced functional materials.
  • Understanding nonlinear conductivity is crucial for improving insulation performance and preventing electrical breakdown.

Purpose of the Study:

  • To fabricate and characterize Calcium Copper Titanate (CaCu₃Ti₄O12)/Ethylene Propylene Diene Monomer (CCTO/EPDM) composites.
  • To investigate the breakdown strength, dielectric, and nonlinear conductivity properties of these composites.
  • To determine the effect of CCTO content on the nonlinear conductivity behavior and electrical field homogenization.

Main Methods:

  • Fabrication of CCTO/EPDM composites with varying CCTO content.
  • Characterization of microstructures using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD).
  • Experimental and simulation-based investigation of electrical breakdown strength, dielectric properties, and nonlinear conductivity.

Main Results:

  • CCTO particles were uniformly dispersed in the EPDM matrix.
  • Composites exhibited nonlinear conductivity above 2 vol % CCTO, with a declining threshold field (Eth) as CCTO content increased.
  • 8 vol % CCTO/EPDM composites showed significant nonlinear conductivity and dielectric properties, effectively homogenizing the electrical field.

Conclusions:

  • CCTO/EPDM composites demonstrate tunable nonlinear conductivity dependent on CCTO content.
  • The threshold field for nonlinear conductivity decreases with increasing CCTO concentration.
  • These composites show promise for applications in cable accessory insulation, particularly for managing nonuniform electrical fields.