The Electrical Behavior of Mica-Polystyrene Composite

Abstract

The electrical properties of mica-polystyrene composites were studied using the impedance measurements technique. The study was carried out as a function of frequency and mica concentration. It was observed that the AC conductivity and the dielectric constant are increased with increasing of the mica content in the composite. The observed electrical results fit approximately the reported empirical equations concerning the AC conductivity and dielectric behavior of polymer composites. Relaxation processes were observed to take place for composites having high mica concentration. The observed relaxation and polarization effects of the composite are mainly attributed to the dielectric behavior of the mica filler. However, the results were explained on the basis of the interfacial (space-charge) polarization, dipolar polarization and decrease of the hindrance produced by the polymer matrix.

Effect of Grain Size on the AC Electrical Properties of Kaolinite/Polystyrene Composites

“…The high impedance values at low frequencies, which mean more resistive behavior, are due to electrode and space charge polarization. The space charge polarization (or Maxwell-Wagner) resulted from some structural defects such as cluster phases, grain boundaries, and accumulations carrying unbound charges at the interfaces [4,10]. In general, the rapid decrease of impedance values with frequency indicates a response with the alternating electric field and may be attributed to the reduction of the interfacial polarization effect, which may exist in the electrode-specimen surface.…”

“…The addition of mineral fillers, including clays and zeolites, to polymeric matrices can improve the electrical and dielectric properties of insulating polymers [3][4][5][6][7]. Kaolinite is a clay mineral with chemical composition Al 2 (Si 2 O 5 )(OH) 4 and layered silicate structure linked through oxygen atoms to one octahedral sheet of alumina octahedral represented by Al 2 ðOHÞ þ2 4 . The kaolinite grains are found in the form of plates throughout the sedimentary rocks of volcanic origin.…”

“…The grains of the natural fillers are of various sizes and shapes, and their grain boundaries play an essential role in the physical behavior in the prepared polymer composites, especially in the mechanical and electrical properties. The addition of mineral fillers, including clays and zeolites, to polymeric matrices can improve the electrical and dielectric properties of insulating polymers [3][4][5][6][7]. Kaolinite is a clay mineral with chemical composition Al 2 (Si 2 O 5 )(OH) 4 and layered silicate structure linked through oxygen atoms to one octahedral sheet of alumina octahedral represented by Al 2 ðOHÞ þ2…”

Electrical properties of oil shale/polystyrene composites

“…The high values of " 0 at low frequency are due to space charge polarization (Wagner-Maxwell effect). 13,14,16 The dielectric constant values of the composites are higher than that of pure PS due to metallic impurities oxides existing in the oil shale mineral. 15,16 The dependence of dielectric constant (" 0 ) and dielectric loss (" 00 ) on temperature are shown in Figures 5 and 6.…”

Ac Electrical Properties of Polystyrene/Ferroelectric Barium Stannate Titanate Ba(Ti0.9Sn0.1)O3Ceramic Composite

“…AbuHijleh et al observed that ac conductivity and dielectric constant increase with increase of mica content in composite [17]. The objective of this research is to study the dielectric properties with annealing effect.…”