Synergistic Effects of <scp>NiO</scp> Nanoparticles in Chlorinated Polyethylene: Eco‐Friendly Mill Mixing for Advanced Thermoplastic Nanocomposites

ABSTRACT This study presents an eco‐friendly mill mixing method to develop polymer nanocomposites from chlorinated polyethylene (CPE) and nickel oxide (NiO) nanoparticles, aiming to enhance performance across a wide temperature range for advanced electronics and electric transportation. FTIR spectra confirm the presence of distinct infrared peaks from NiO in the CPE matrix, while XRD analysis reveals improved crystallinity upon NiO incorporation. UV–Vis spectroscopy demonstrates the smallest optical bandgap and highest refractive index values for CPE with 7 wt% NiO. FE‐SEM analysis verifies the homogeneous dispersion of nanoparticles, while HR‐TEM confirms nanoscale uniformity in the 7 wt% nanocomposite. DSC and TGA analyses demonstrate that incorporating NiO significantly enhances the thermal properties of CPE. Evaluation of AC conductivity, dielectric constant, and complex dielectric modulus reveals that the 7 wt% NiO nanocomposite has the highest values of these properties, with a 2.2‐fold increase in dielectric constant and 4.6‐fold improvement in conductivity, supported by its lowest activation energy. Mechanical testing further reveals a 70% increase in tensile strength, a 54% enhancement in impact strength, and a 9% rise in hardness for the 7 wt% nanocomposite. This work contributes to the advancement of flexible conductive thermoplastic nanocomposites, positioning them as promising materials for high‐performance energy storage applications.