Dielectric Spectroscopy and Synergistic Effects in Epoxy Composites Filled with Multi-Walled Carbon Nanotubes and Carbon-Coated Copper Nanoparticles
Polymer Composites 2024
Dzmitry Tsyhanok, Darya Meisak, Juras Banys, Jan Macutkevič, Algirdas Selskis, Aļisa Šabaļina, Oskars Platnieks, Sergejs Gaidukovs

The electromagnetic properties of epoxy-based composites filled with carbon-coated copper (Cu@C) nanoparticles and multi-walled carbon nanotubes (MWCNTs), along with hybrid MWCNT/Cu@C/Epoxy systems containing varying concentrations of nanoinclusions, were systematically investigated across multiple frequency and temperature ranges. Measurements were conducted in the low-frequency range (20 Hz–1 MHz) and over a temperature span of 40–500 K, as well as in the microwave frequency range (26–37 GHz) at room temperature. The percolation threshold was identified at approximately 2.5 vol% for composites containing only Cu@C nanoparticles and at 0.3 vol% for composites with MWCNTs. Notably, the hybrid MWCNT/Cu@C/Epoxy composites exhibited significantly enhanced electromagnetic properties compared to those of the single-filled systems. At room temperature, an epoxy composite containing 5 vol% Cu@C and 1 vol% MWCNT exhibits a conductivity of approximately 4 × 10−2 S/m, which increases by nearly two orders of magnitude following a thermal cycle up to 500 K. The total electromagnetic interference (EMI) shielding effectiveness in the 26–37 GHz range was measured between 4 and 9 dB, indicating the material's promising potential for attenuating microwave noise. Dynamic mechanical analysis (DMA) results revealed that increasing the MWCNT content improved the storage modulus of the composites but led to a reduction in the glass transition temperature (Tg), which was observed to range between 40 and 50°C. The incorporation of MWCNTs and Cu@C nanoparticles into epoxy matrices offers a promising approach for the development of lightweight multifunctional composites with superior electrical, mechanical, and EMI shielding properties


Atslēgas vārdi
dielectric properties, electrical percolation, epoxy, mechanical analysis, microwave shielding, nanotubes
DOI
10.1002/pc.29337
Hipersaite
https://4spepublications.onlinelibrary.wiley.com/doi/10.1002/pc.29337

Tsyhanok, D., Meisak, D., Banys, J., Macutkevič, J., Selskis, A., Šabaļina, A., Platnieks, O., Gaidukovs, S. Dielectric Spectroscopy and Synergistic Effects in Epoxy Composites Filled with Multi-Walled Carbon Nanotubes and Carbon-Coated Copper Nanoparticles. Polymer Composites, 2024, , 1.-14.lpp. ISSN 0272-8397. e-ISSN 1548-0569. Pieejams: doi:10.1002/pc.29337

Publikācijas valoda
English (en)
RTU Zinātniskā bibliotēka.
E-pasts: uzzinas@rtu.lv; Tālr: +371 28399196