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Nano-dielectric BiFeO3/LDPE films of different percentages including 0.2 wt% and 2 wt%, have been successfully prepared by using solution-melt blending method in the spiral double pole rheometer. This paper studies on effect of magnetic field induction on crystallization properties of BiFeO3/LDPE nano-dielectric. For the purpose of research on the effect of magnetization on the morphology and crystallization...
The influence of the small-scale effects on propagation behavior of horizontally polarized shear waves (SH-waves) in a nano scale periodic piezoelectric-polymeric layered structure which are composed of piezoelectric thin films bonded perfectly with polymeric thin films alternately is investigated. The research using the transfer matrix method based on the nonlocal piezoelectricity continuum theory...
The nature of carrier traps in polyester (PET) and polyethylene (PE) has been widely investigated by respectively using thermally stimulated current (TSC) and photo-stimulated discharge (PSD). Under non-isothermal technology, the trap depths of Polyester sample for the TSC peaks were about 0.50eV, for the PSD peaks were various from 3.8eV to 4.8eV. The trap depths of polyethylene sample for the TSC...
The distribution of charge trap in polyethylene was studied by means of photo-stimulated discharge (PSD) and thermally stimulated discharge (TSD). The shallow trap of 0.77eV in the analysis of TSD comes from the same trap distribution as the deep trap of the depth from 4.80 to 5.90eV in PSD. The results showed that the trap itself is suffered from thermal erosion in the process of charge released...
Thermally stimulated current (TSC) is developed and a new method for direct determination of trap level distribution in polymer film is proposed. In this method, a new function is defined to weight the contribution of a trap level to the current at any temperature. The demarcation energy is used to study the trap empty process. Analysis shows that only electrons with trap levels very close to the...
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...
In the present paper, the dielectric properties of polypropylenes with different crystal forms were investigated. The space charge distribution was measured by using electro-acoustic pulse and the effect of space charge on short circuit breakdown was analyzed by using DC pre-stress voltage. Relative crystallinity of the beta crystal in beta crystal form polypropylenes was analyzed by using DSC, and...
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