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<p>Hybrid polymer nanocomposites are increasingly explored as lightweight dielectric materials for flexible electronic systems, where simultaneous electrical performance and mechanical robustness are required. This study investigates interfacial polarization in hybrid polymethyl methacrylate (PMMA) nanocomposites reinforced with n-type silicon carbide (SiC) and p-type nickel oxide (NiO) nanoparticles. The nanocomposite films were synthesized via a solution-casting route to examine how p–n interfaces influence the electrical and mechanical properties simultaneously, which remains relatively unexplored in PMMA-based hybrid nanocomposites. Structural and morphological characterizations (XRD, FTIR, SEM) confirmed the amorphous nature of PMMA and the uniform dispersion of SiC and NiO, enabling the formation of stable polymer–ceramic interphases. The simultaneous incorporation of n-type and p-type fillers generated localized p–n interfacial polarization, which enhanced Maxwell–Wagner–Sillars interfacial polarization and space-charge accumulation. Consequently, the hybrid nanocomposites exhibited a substantial dielectric enhancement, achieving a dielectric constant of ε′ ≈ 392 at 5 wt% loading, accompanied by an increase in AC conductivity to 1.79 × 10⁻<sup>6</sup> S/cm, governed predominantly by hopping and tunneling mechanisms. The mechanical testing conducted with the Universal Testing Machine further demonstrated notable reinforcement, with tensile strength increasing by 79% and Young’s modulus improving 5.5-fold (10.85&#xa0;MPa) relative to pristine PMMA, attributed to restricted polymer chain mobility and effective load transfer at the interfaces. The findings indicate that SiC–NiO hybrid fillers offer a viable method for optimizing the dielectric and mechanical properties of PMMA-based nanocomposites for prospective applications in flexible electronic materials.</p>

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Interfacial polarization in PMMA/SiC–NiO hybrid nanocomposites with enhanced dielectric and mechanical performance for flexible electronic applications

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Kiran Thakur,
  • Jitendra Prakash Chandra,
  • Dinesh Uthra,
  • Ahmed Hashim

摘要

Hybrid polymer nanocomposites are increasingly explored as lightweight dielectric materials for flexible electronic systems, where simultaneous electrical performance and mechanical robustness are required. This study investigates interfacial polarization in hybrid polymethyl methacrylate (PMMA) nanocomposites reinforced with n-type silicon carbide (SiC) and p-type nickel oxide (NiO) nanoparticles. The nanocomposite films were synthesized via a solution-casting route to examine how p–n interfaces influence the electrical and mechanical properties simultaneously, which remains relatively unexplored in PMMA-based hybrid nanocomposites. Structural and morphological characterizations (XRD, FTIR, SEM) confirmed the amorphous nature of PMMA and the uniform dispersion of SiC and NiO, enabling the formation of stable polymer–ceramic interphases. The simultaneous incorporation of n-type and p-type fillers generated localized p–n interfacial polarization, which enhanced Maxwell–Wagner–Sillars interfacial polarization and space-charge accumulation. Consequently, the hybrid nanocomposites exhibited a substantial dielectric enhancement, achieving a dielectric constant of ε′ ≈ 392 at 5 wt% loading, accompanied by an increase in AC conductivity to 1.79 × 10⁻6 S/cm, governed predominantly by hopping and tunneling mechanisms. The mechanical testing conducted with the Universal Testing Machine further demonstrated notable reinforcement, with tensile strength increasing by 79% and Young’s modulus improving 5.5-fold (10.85 MPa) relative to pristine PMMA, attributed to restricted polymer chain mobility and effective load transfer at the interfaces. The findings indicate that SiC–NiO hybrid fillers offer a viable method for optimizing the dielectric and mechanical properties of PMMA-based nanocomposites for prospective applications in flexible electronic materials.