Scholarlink

<p>Polymer nanocomposites combining dielectric properties with controlled conductivity are critical for advanced energy storage applications. This study investigates polyethylene oxide/sodium alginate (PEO/SA) blends reinforced with multi-walled carbon nanotubes (MWCNTs). PEO/SA/MWCNTs nanocomposites were fabricated using solution casting, with TEM confirming uniform dispersion of MWCNTs (diameters: 13.30–22.16&#xa0;nm) without aggregation. DSC analysis revealed enhanced thermal stability, demonstrated by increased glass transition (T<sub>g</sub> ↑ 10%), melting (T<sub>m</sub> ↑ 12%), and decomposition temperatures, attributed to strong interfacial interactions. Electrical properties showed a significant improvement in conductivity: threefold (to 2.81 × 10⁻⁹ S.cm<sup>− 1</sup> at 100&#xa0;Hz) at a concentration of 0.40 wt% MWCNTs, with further improvement at elevated temperatures. Dielectric studies demonstrated exceptional permittivity (ε′ = 1.66 × 10<sup>3</sup>at a concentration of 0.40 wt% MWCNTs, a 447% increase compared to the pure blend) and frequency-dependent behavior, with both ε′ and ε″ values decreasing steadily before stabilizing above 1&#xa0;MHz. The loss tangent (Tanδ) demonstrated dual dependency: increasing with MWCNTs concentration/temperature but decreasing with frequency due to reduced interfacial polarization. These results establish PEO/SA/MWCNTs nanocomposites as promising next-generation dielectric materials for flexible energy storage and optoelectronic systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of encapsulated multi-walled carbon nanotubes on the thermal, electrical, and dielectric properties of PEO/SA nanocomposites

  • 期刊论文

  • 发表日期：

    2025年11月17日

查看全文
  • Maha Aiiad Alenizi,
  • A. M. Alshehari,
  • A. H. Oraby,
  • E. Salim,
  • E. M. Abdelrazek,
  • G. M. Asnag,
  • M. A. Morsi

摘要

Polymer nanocomposites combining dielectric properties with controlled conductivity are critical for advanced energy storage applications. This study investigates polyethylene oxide/sodium alginate (PEO/SA) blends reinforced with multi-walled carbon nanotubes (MWCNTs). PEO/SA/MWCNTs nanocomposites were fabricated using solution casting, with TEM confirming uniform dispersion of MWCNTs (diameters: 13.30–22.16 nm) without aggregation. DSC analysis revealed enhanced thermal stability, demonstrated by increased glass transition (Tg ↑ 10%), melting (Tm ↑ 12%), and decomposition temperatures, attributed to strong interfacial interactions. Electrical properties showed a significant improvement in conductivity: threefold (to 2.81 × 10⁻⁹ S.cm− 1 at 100 Hz) at a concentration of 0.40 wt% MWCNTs, with further improvement at elevated temperatures. Dielectric studies demonstrated exceptional permittivity (ε′ = 1.66 × 103at a concentration of 0.40 wt% MWCNTs, a 447% increase compared to the pure blend) and frequency-dependent behavior, with both ε′ and ε″ values decreasing steadily before stabilizing above 1 MHz. The loss tangent (Tanδ) demonstrated dual dependency: increasing with MWCNTs concentration/temperature but decreasing with frequency due to reduced interfacial polarization. These results establish PEO/SA/MWCNTs nanocomposites as promising next-generation dielectric materials for flexible energy storage and optoelectronic systems.