Characterization of LDPE-Metal Oxide Nanocomposites Using Thermo-Analytical and Spectroscopic Techniques

Abstract

Polyethylene metal oxide nanocomposites find their application as high voltage insulation for direct current cables, to mitigate the space charge and other issues. Nano particles like SiO 2 , MgO, ZnO etc are used as filler materials in polyethylene matrix to achieve good electrical and mechanical properties like: space charge reduction, enhanced surface & volume resistivity and higher dielectric stress withstand capabilities. Surface modification of metal particles is usually done by treating the nanoparticles with silane to have good distribution and dispersion of metal particles in polyethylene. However, characterization of nanocomposite based on spectroscopic and thermo-analytical techniques is very essential to understand its long term performance and its reliability when used as insulation in HVDC extruded power cables. Different metal oxide nanoparticles such as MgO and SiO 2 have been investigated as fillers in low density polyethylene. The distribution and dispersion of the nanoparticles in the LDPE is determined by SEM (Scanning Electron Microscopy). Kinetic studies were carried out by measuring enthalpy, melting temperature, percentage decomposition using simultaneous thermal analyser. Fourier Infrared spectrometer, X-ray diffractometer and dielectric spectrometer are used for characterization and dielectric response. The results are presented and discussed.