Enhancing the Electro-mechanical Properties of Linear Low density Polyethylene in confined space

The rising demand for miniaturized, high-performance electronic systems in power, medical, and defense applications has driven research into advanced polymer dielectrics with superior electrical, thermal, and mechanical stability. Among major dielectric materials, polymer film capacitors stand out for their high voltage tolerance, flexibility, and predictable failure behavior. Semicrystalline polymers such as linear low-density polyethylene (LLDPE) are especially promising due to their low cost, ease of processing, and high breakdown strength. This study investigates the electromechanical behavior of LLDPE thin films under confined geometries to determine how film thickness influences dielectric permittivity, breakdown strength, and mechanical modulus. A notable threefold enhancement in dielectric breakdown strength was observed in sub-200 nm films. By integrating electrical, mechanical, and morphological analyses, this work advances understanding of confined polymer thin films, guiding the design of lightweight, flexible, high-energy-density polymer dielectrics for next-generation electronic systems.