Preparationandelectricalpropertiesinepoxyresin/In2O3:Sn nanocompositesmaterialsforoptoelectronics (original) (raw)
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Epoxy resin nanocomposites with In2O3 doped 15% Sn (ITO) as nanofillers were fabricated to investigate the relationship between the polarization and depolarization current (PDC). The PDC, time to frequency domain transformation, dielectric parameters, charge carrier mobility and absorption current of epoxy nanocomposites samples are discussed. It is observed that the current magnitude increases in the nanocomposites with loading of nano-ITO than that of pure epoxy. While the current behavior through the epoxy decreases with time in a conventional manner, all nanocomposites reveal a decrease equally. Absorption current is an important characteristic of polymers with regard to their time domain response at direct field. The results of absorption current measurements can be used to understand the relationship between space charge accumulation and movement. The charge accumulation is likely to be influenced by the presence of charge trapping sites, which are associated with interactions between the nanoparticles and amorphous phases. The presence of such interfaces will affect the current flow due to the modification of the distribution of trapping sites within the material. Our results indicate that the absorption current behavior was affected by the added nano-ITO in epoxy matrix.
Effect of nanofillers on the dielectric properties of epoxy nanocomposites
Advances in materials Research, 2012
Epoxy resin is widely used in high voltage apparatus as insulation. Fillers are often added to epoxy resin to enhance its mechanical, thermal and chemical properties. The addition of fillers can deteriorate electrical performance. With the new development in nanotechnology, it has been widely anticipated that the combination of nanoparticles with traditional resin systems may create nanocomposite materials with enhanced electrical, thermal and mechanical properties. In the present paper we have carried out a comparative study on dielectric properties, space charge and dielectric breakdown behavior of epoxy resin/nanocomposites with nano-fillers of SiO 2 and Al 2 O 3. The epoxy resin (LY556), commonly used in power apparatus was used to investigate the dielectric behavior of epoxy resin/nanocomposites with different filler concentrations. The epoxy resin/nanocomposite thin film samples were prepared and tests were carried out to measure their dielectric permittivity and tan delta value in a frequency range of 1 Hz-1 MHz. The space charge behaviors were also observed by using the pulse electroacoustic (PEA) technique. In addition, traditional epoxy resin/microcomposites were also prepared and tested and the test results were compared with those obtained from epoxy resin/nanocomposites.
2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)
In this study, the effect of 0.75 weight percent filler silica (SiO2) with PI or PA nanowires for dielectric properties of epoxy resin EPOXYLITE 3750 LV (ER) was studied. For this purpose, direct unidirectional conductivity measurements and broadband dielectric spectroscopy measurements were used to describe changes in the dielectric responses of ER / SiO2 nanocomposites with nanowires in the frequency and temperature range. The presence of nanowires and nanoparticles in the epoxy resin affected the segmental dynamics of the polymer chain and altered the charge distribution in the system. These changes caused a change in permittivity values and a shift in local relaxation peaks in the imaginary permittivity and dissipation factor spectra of nanocomposites. Experiments have shown that temperaturedependent transitions of electrical properties in nanocomposites are associated with to relaxation processes.
The influence of ZnO nanoparticles on the dielectric properties of epoxy resin
APPLIED PHYSICS OF CONDENSED MATTER (APCOM 2019)
Interesting electrical properties represent the epoxy nanocomposites, because the addition of nanofillers to a pure epoxy resin demonstrate several advantages opposite to pure epoxy resin without nanofillers. In the last 20 years, the dielectric properties (the complex permittivity and dissipation factor) of epoxy nanocomposites had been evaluated and the results clearly show that they are lower than that of base epoxy and microcomposites when insulating oxides were used as the fillers. Nowadays the epoxy and epoxy based composites are preferred insulating materials for many electrical applications. The influence of the various concentrations of ZnO nanoparticles in epoxy resin Vukol 022 on the changes of the complex permittivity and dissipation factor has been measured at the temperature range from 20 °C to 120 °C by a capacitance method in the frequency ranges from 1 mHz to 1 MHz. In this contribution, we present a study of the influence of 1,0 wt.% and 5,0 wt. % concentrations of ZnO nanofillers on the dielectric properties of the epoxy resin. From the frequency dependence of dissipation factor, α-relaxation process and its shift to lower frequencies with ZnO fillers were observed.
Role of the interface in determining the dielectric properties of nanocomposites
The 17th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2004. LEOS 2004.
It has been demonstrated that the electrical breakdown properties of polymer composites can be substantially enhanced when the filler particles are of nanometric dimensions. These benefits are likely related to the mitigation and redistribution of internal charge. Using the example of an epoxy-TiO 2 nanodielectric (and a comparable conventional composite), this contribution seeks to examine this issue from the physical and chemical viewpoint. It is shown that a reduction in free volume cannot be used to explain the dielectric enhancements. The free volume of nanomaterials is actually higher than that of conventional samples. This conclusion is consistent with recent application of electron paramagnetic resonance methods, which have confirmed earlier speculation that the environment associated with the interface is radically changed when the in-filled particulates are reduced to nanometric dimensions and the associated interfacial area is greatly increased. Through examinations of infrared absorption & EPR, the paper provides some speculation on the part played by an interaction zone surrounding the particulate inclusions. The presence of a highly mobile interlayer is thought to be the key to the electrical property changes seen.
Dielectric relaxations investigation of a synthesized epoxy resin polymer
A diglycidylether of bisphenol A (DGEBA) epoxy resin was synthesized, and cured with 3, 3′- diaminodiphenyl sulfone (DDS) at a curing temperature of 120 ◦C. The relaxation properties of the realized polymers were studied by two complementary techniques: dielectric relaxation spectroscopy (DRS), in the temperature range 173–393K and in the frequency interval 10−1–106 Hz, and thermally stimulated depolarization current (TSDC) with a windowing polarization process. Current-voltage (I-V) measurements were also carried out to study interfacial relaxations. Dielectric data were analyzed in terms of permittivity and electric modulus variations. Three relaxation processes (, and ) have been identified. They were found to be frequency and temperature dependent and were interpreted in terms of the Havriliak-Negami approach. Relaxation parameters were determined by fitting the experimental data. The temperature dependence of the relaxation time was well fitted by the Arrhenius law for secondary relaxations, while the Vogel-Fulcher-Tamann model was found to better fit the (T) variations for relaxation. We found 0 = 4.9 10−12 s, 9.6 10−13 s and 1.98 10−7 s for , and relaxations, respectively. The obtained results were found to be consistent with those reported in the literature. Due to the calculation of the low-frequency data of dielectric loss by the Hamon approximation, the Maxwell-Wagner-Sillars (MWS) relaxation was highlighted.
The influence of nanoparticles in the epoxy resin on dielectric parameters and partial discharges
2018 ELEKTRO
In order to study the influence mechanism of nanoparticles on the dielectric properties of epoxy resin materials for composite insulators under different nanoparticle filling amounts, the free volume, dielectric relaxation, breakdown strength and trap distribution of the samples were tested by positron annihilation lifetime spectroscopy, breakdown strength, broadband dielectric spectroscopy (BDS) and thermally stimulated current (TSC). The results show that the limiting effect of nanoparticles rapidly reduced the number of traps in the amorphous zone of materials at a low filling amount. As a result, the free path of carriers was increased and the concentration of free volume was decreased, which can limit the injection and transportation of carriers, resulting in the increase of material breakdown strength. At a high filling amount, a large number of interfacial deep traps were introduced into the nanoparticles, and the carrier free volume concentration and size were reduced. The traps inside the material were mainly interfacial deep traps. Under the action of an external electric field, a hetero polar charge was formed on the other end to cause electric field distortion, thus the breakdown field strength of the material was weakened.
Towards an understanding of nanometric dielectrics
Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2002
Dielectric studies are described aimed at providing an understanding of the charge storage and transport of an epoxy resin containing TiO 2 nanoparticles. Comparative results for conventionally filled composites are given, and the results discussed in terms of the underlying physics. It is shown that nanometric fillers mitigate the interfacial polarization characteristic of conventional materials with a reduction in the internal field accumulations.
Study of dielectric relaxations in zinc oxide-epoxy resin nanocomposites
Journal of Alloys and Compounds, 2009
Thermally stimulated depolarization current (TSDC) and dielectric relaxation spectroscopy (DRS) techniques were employed to study the relaxations and the conductivity phenomena in epoxy-based polymer. In addition to the primary ␣ relaxation process associated with the glass-rubber transition, significant interfacial relaxation and ionic conduction process have been revealed. The ac conductivity is temperature and frequency dependent and shows a dc plateau at low frequencies. Above the glass transition temperature, dc conductivity is described by a Vogel-Tamman-Fulcher-Hesse (VFTH) equation while it shows Arrhenius behaviour at higher temperatures.
Dielectric Spectroscopy of Composites of Epoxy Resin
Journal of Basic & Applied Sciences, 2013
The dielectric behavior of composite of epoxies having different composition of prepolymer and epoxy equivalent is investigated in the frequency range 1E-1Hz to 1E5Hz at room temperature. The measurements presented consist of two sets of sample of epoxy resin with two different proportions 1:1 and 1:0.5 of resin and hardener. Samples having different proportion of resin and hardener shows low frequency dispersion (LFD) in the frequency range below 3 KHz at small thickness (less than 0.38mm). At large thickness the sample response is similar for the two different proportions.