Influence of ZnO (Nano)Rods on the Dielectric Properties of DGEBF Epoxy Exposed to Progressive Artificial Weathering for VHF/Early UHF Applications (original) (raw)
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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.
Influence of filler loading on dielectric properties of epoxy-ZnO nanocomposites
IEEE Transactions on Dielectrics and Electrical Insulation, 2009
Experimental investigations into the dielectric properties of epoxy-ZnO nanocomposites at different filler loadings reveal few unique behaviors (at certain filler loadings) and also advantageous characteristics in contrast to the properties obtained for the corresponding microcomposites. Results demonstrate that in nanocomposites, it is possible to achieve lower values of permittivity and tanδ with respect to unfilled epoxy over a wide frequency range. Analysis of the results attributes this interesting observation to the interaction dynamics between the epoxy chains and the ZnO nanoparticles at the interfacial area. The dc volume resistivities and ac dielectric strengths of nanocomposites were also experimentally determined in the present study and the obtained characteristics are found to be different as compared to the results obtained for microcomposites. The volume fraction and nature of the interfaces in the bulk of the composites seem to influence this difference in the examined dielectric properties of the nanocomposites.
Journal of Materials Science: Materials in Electronics, 2018
The Mn:ZnO/epoxy nanocomposites (MZO-EP-NCs) resin samples are prepared using the ultrasonication method. This work deals with the systematic investigation of microstructural, optical and electrical properties of MZO fillers incorporating to the epoxy resin. These samples are characterized by scanning electron microscopy (SEM), X-ray diffraction and UV-Vis spectroscopy. SEM micrographs revealed that the as-prepared MZO nanocrystals are presented in the spherical clusters. X-ray diffraction indicates that the MZO-EP-NCs samples exhibit the presence of MZO nanocrystals peaks. Optical analyses showed a decrease in the band gap energy with increasing the MZO concentrations and a high UV-absorption of MZO-EP-NCs due to the light scattering due to the incorporating MZO particles in the epoxy. Such changes can be described by the shift of HOMO and LUMO band's transition in the studied samples. Our results support the correlation between structure and optical properties of the mentioned nanocomposites. At high electromagnetic waves, the dielectric permittivities are decreased linearly with the addition of MZO clusters compared to neat epoxy. The obtained optical parameters supporting the improvement of the UV shielding properties of MZO-EP-NCs samples.
Impact of ZnO nanoparticles on mechanical and dielectric properties of epoxy resin composites
Nucleation and Atmospheric Aerosols, 2023
The influence of nano filler content on the mechanical and dielectric properties of epoxy nanocompounds is investigated in this research. Epoxy is used as the matrix material. A different ratio of ZnO nanofiller was used (0.1,0.3,0.5,0 and 0.7 by weight), The test samples were prepared using an open die type, and tests were performed (three-point bending, stiffness, modulus of elasticity, and dielectric), and the mechanical and dielectric properties of the composite materials were determined and evaluated. With increasing the percentage of nanofiller material, the values of dielectric constant and loss factor decrease, while bending strength, flexural modulus, and stiffness increased, values It were before adding the nanofillers (1.05 MPa),(0.164 GPa),(79 N/mm 2) respectively, and after the reinforcement, they increased than they were to become (6.15 MPa),(1.636 GPa),(81 N/mm 2) respectively.
Effect of ZnO nanoparticles on the dielectric properties of polyurethane and epoxy resins
APPLIED PHYSICS OF CONDENSED MATTER (APCOM 2021)
This study aims to present the influence of Zinc Oxide (ZnO) filler on the dielectric properties of two types of commercial potting compounds. For this purpose, the methods of dielectric spectroscopy were used to measure the changes in dielectric responses of polyurethane and epoxy by 1.0 wt. % ZnO over the frequency and temperature range, respectively. Two representatives of polyurethane and epoxy mixtures (VUKOL 022 and EPOXYLITE 3750 LV), that are commercially used in industry for filling cavities of all kinds (construction of electrical equipment), were used for this investigation. The ZnO nanoparticles in EPOXYLITE 3750 LV caused an increase, and in VUKOL 022 a decrease of the real permittivity compared to the pure matrix. Its decrease was most likely caused by the presence of highly immobile polyurethane chains in the interfacial regions around nanoparticles. The shift of a low relaxation maximum to higher frequencies for nanocomposite base on EPOXYLITE 3750 LV was affected by a smaller local electric field and electric double layers around the nanoparticles.
Elaboration and dielectric property of modified PZT/epoxy nanocomposites
Composites of lead zirconate titanate (PZT) 50 nm nanoparticles and epoxy resins have been produced with various PZT contents from 0 to 20 wt%. The morphology and thermal properties of prepared composites were characterized using scanning electron microscopy and differential scanning calorimetry. The PZT nanoparticles were found to be well dispersed in the epoxy resin matrix. The glass transition temperature (T g ) value of the nanocomposites increases from 164 to 178 C with increasing the PZT weight fraction. The dielectric composites properties dependences were studied via a wide range of frequency from 10 Hz to 100 kHz. The dielectric constant of PZT/epoxy composite was increased from 5.56 to 6.29 (at f 5 1 kHz, T 5 30 C), respectively to the incorporated PZT amount, and these values are higher than that the dielectric constant of pure cured epoxy resin, e 5 4.86. POLYM.
Transportation Research Procedia, 2019
Epoxy resins are used as electro-insulating materials because they have great electro-insulation properties, adhesion, chemical resistance, and minimal shrinkage during curing. Epoxy nanocomposites have gained much interest in the area of nanotechnology, because of the ease of manufacture and the significant gain in properties. The influence of the various concentration 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 o C to 120 o C. Frequency dependences of these parameters were measured within the frequency ranges from 1 mHz to 1 MHz by a capacitance method. The 0,5 wt.% nanoparticles caused a decrease of the real part of the complex relative permittivity. The higher concentration of nanoparticles for frequencies above 10 Hz had higher real relative permittivity as pure epoxy resin. At the study of the influence of temperature on dissipation factor, α-relaxation process and its shift to lower frequencies with ZnO fillers were observed.
A Study on the Dielectric Properties of SGM-Filled Epoxy Composites
2012
Materials used for electronic packaging and printed circuit boards need to have multi- functional properties such as adequate thermal conductivity and controlled dielectric const. Hardened neat epoxy inspite of its good mechanical strength, often cannot satisfy this demand. In view of this, in the present work, Solid glass micro-sphere (SGM) filled Epoxy composites, with filler content ranging from 0 to 20 vol% have been prepared with an objective to modify the dielectric properties of the epoxy. Dielectric constant measurements are made for these composites using a HIOKI- 3532-50 Hi Tester Elsier Analyser with an applied Ac voltage of 500mv in the frequency range of 1kHz to 1 MHz. However in this study it is also noticed that that the thermal conductivity of the composites decreased with increase in SGM content which is not desirable. Thus, inorder to obtain relatively high thermal conductivity and low dielectric constant simultaneously, this paper suggests further addition of some...