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In this work, Polyester/CNT and DGEBA/CNT composites were prepared with varying CNT contents to investigate their thermal, electricalElectrical, and dielectricDielectric behavior. DSC revealed opposite effects on the glass transition: in Polyester/CNT, \({\text{T}}_{\text{g}}\) increased from ≈54 °C (neat) to 71 °C at 2% CNT (Δ \({\text{T}}_{\text{g}}\) ≈ +17 °C), while in DGEBA/CNT it decreased from ≈63 °C (neat) to 58 °C at 5% CNT (Δ \({\text{T}}_{\text{g}}\) ≈ −5 °C). DC conductivityConductivity showed different percolation thresholdsPercolation threshold: ≈0.6% for Polyester/CNT and ≈2.7% for DGEBA/CNT. AC conductivityAC conductivity exhibited Jonscher’s universal power-law behavior with frequency exponents between 0.84 and 0.99, characteristic of hopping conduction. DielectricDielectric spectroscopy highlighted strong conduction losses in Polyester/CNT composites, while relaxation processes were detected in DGEBA/CNT composites. A Kramers–Kronig derivative method, applied to the Polyester/CNT composites, further revealed hidden relaxation peaks that were otherwise masked by conduction losses. These findings confirm the decisive role of the polymer matrix in governing the multifunctional performance of CNT-based composites.

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Electrical and Dielectric Performance of Polyester and DGEBA Composites with Carbon Nanotube Inclusions

  • 会议论文

  • 发表日期：

    2026年

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  • Z. Samir,
  • N. Aribou,
  • R. Belhimria,
  • Y. Nioua,
  • S. Boukheir,
  • M. E. Achour,
  • L. C. Costa,
  • A. Oueriagli

摘要

In this work, Polyester/CNT and DGEBA/CNT composites were prepared with varying CNT contents to investigate their thermal, electricalElectrical, and dielectricDielectric behavior. DSC revealed opposite effects on the glass transition: in Polyester/CNT, \({\text{T}}_{\text{g}}\) increased from ≈54 °C (neat) to 71 °C at 2% CNT (Δ \({\text{T}}_{\text{g}}\) ≈ +17 °C), while in DGEBA/CNT it decreased from ≈63 °C (neat) to 58 °C at 5% CNT (Δ \({\text{T}}_{\text{g}}\) ≈ −5 °C). DC conductivityConductivity showed different percolation thresholdsPercolation threshold: ≈0.6% for Polyester/CNT and ≈2.7% for DGEBA/CNT. AC conductivityAC conductivity exhibited Jonscher’s universal power-law behavior with frequency exponents between 0.84 and 0.99, characteristic of hopping conduction. DielectricDielectric spectroscopy highlighted strong conduction losses in Polyester/CNT composites, while relaxation processes were detected in DGEBA/CNT composites. A Kramers–Kronig derivative method, applied to the Polyester/CNT composites, further revealed hidden relaxation peaks that were otherwise masked by conduction losses. These findings confirm the decisive role of the polymer matrix in governing the multifunctional performance of CNT-based composites.