Polymeric nanocomposites have gained importance in the manufacture of products of high performance properties like light
weight, material transparency, enhanced stiffness and toughness,
increased barrier properties, decreased thermal expansion,
decreased flammability and increase in dielectric properties of
electrical and electronics industries [1–8]. Polyethylene (PE) is
widely used as an insulation material, particularly cross-linked
polyethylene in electrical power transmission cables. Much theo-
retical and experimental work on its electrical properties has been
published over the last 50 years [1–8]. Although its basic chemical
composition (–CH2–)n is simple, its semi-crystallinemorphology is
very complex, and thus charge injection at the electrodes and
transport through the volume are also complex processes. It is of
interest to note that crystalline polyethylene has a negative elec-
tron affinity, i.e. the bottom of the conduction band is approxi-
mately 1 eV above the vacuum level, and electron traps with
depths in the range 0–0.3 eV formed by the conformations of the
polymer chains themselves are to be expected in semi-crystalline
polyethylene [9–11]. The dispersion of a very low ratio of inorganic
particles having at least one dimension smaller than 100 nm can
creates a network of chemical-physical interactions inside an
organic matrix, leading to a dramatic change in the macroscopic