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SiO2/LDPE nanocomposites can effectively decrease space charge accumulation at room temperature. However, space charge build up and suppress mechanism in nanocomposite are still not well understood. Experiments results showed that LDPE has a TSC peak around 60°C and the mechanical loss curve of LDPE which has a peak corresponding to the α-relaxation correspond well to the TSC peak. Space charge of...
Semiempirical quantum mechanical calculations have been implemented to study the molecular structure, electronic structure, optical properties of polyacene quinone radical polymers, and the quantum transport properties are also been calculated through combination of the numerical atomic orbitals basis set method based on density functional theory with the non-equilibrium Green??s function formalism...
Using type NaY nanoscale zeolite powder doped into Low-density Polyethylene(LDPE) by melt blending method, obtained the LDPE/Zeolite composite with different zeolite weight percentage from 0.5wt% to 3wt%. When the electric field rising up from 10kV/mm to 40kV/mm, the space charge distributions were investigated separately with pulsed electro-acoustic(PEA) method. The space charge distributions at...
LDPE has been widely used in electrical insulation and high voltage device application. In this paper we have studied the characteristics of electrical tree aging at AC voltage in LDPE, with the continuous applied voltage to observe the propagation of electrical tree. The electrical tree experiments were carried out with needle-plane specimens. At the same time the barriers of different polymer films...
Photo-stimulated discharge (PSD) spectroscopy of polyester (PET), polypropylene (PP), polyimide (PI) of DuPont charged by either corona discharge or contact electrode were performed with self-made PSD measurement system in order to investigate the space charge traps of the polymers. The samples were irradiated with new type of continuously tunable wavelength laser based on the optical parametric oscillator...
Low-density polyethylene (LDPE)/pumice composites with different pumice weight percentage (1 wt%, 2 wt% and 5 wt%) were prepared by melt blending process in torque rheometer. Space charge distribution in composites and pure LDPE were investigated with pulsed electro-acoustic method (PEA). The results indicate that most of the space charge in pure LDPE under high electrical field was homo-polarity...
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