Influence of SiO2 nanoparticles and nanofibrous filler on the dielectric properties of epoxy-based composites

Mentlík, Václav; Michal, Ondřej

doi:10.1016/j.matlet.2018.04.021

Cited by 19 publications

(9 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…On the other hand, the behavior of dispersed conductive fillers is very-well known [45,46,47,48] and percolation threshold could be estimated based on the significant increase of conductivity. However, the dielectric parameters of basic material could be improved by addition of relatively low amount of nanofiller, as is evident from our previous studies [49,50,51]. In connection with these claims, the study [52] describes a theory of percolation and interfacial characterisation via breakdown voltage measurement.…”

Section: Improvement Of Epoxy Based Composites Insulating Propertiesmentioning

confidence: 90%

Magnesium Oxide Nanoparticles: Dielectric Properties, Surface Functionalization and Improvement of Epoxy-Based Composites Insulating Properties

et al. 2018

Self Cite

View full text Add to dashboard Cite

Composite insulation materials are an inseparable part of numerous electrical devices because of synergy effect between their individual parts. One of the main aims of the presented study is an introduction of the dielectric properties of nanoscale magnesium oxide powder via Broadband Dielectric Spectroscopy (BDS). These unique results present the behavior of relative permittivity and loss factor in frequency and temperature range. Following the current trends in the application of inorganic nanofillers, this article is complemented by the study of dielectric properties (dielectric strength, volume resistivity, dissipation factor and relative permittivity) of epoxy-based composites depending on the filler amount (0, 0.5, 0.75, 1 and 1.25 weight percent). These parameters are the most important for the design and development of the insulation systems. The X-ray diffraction patterns are presented for pure resin and resin with optimal filler amount (1 wt %), which was estimated according to measurement results. Magnesium oxide nanoparticles were also treated by addition of silane coupling agent (γ-Glycidoxypropyltrimethoxysilane), in the case of optimal filler loading (1 wt %) as well. Besides previously mentioned parameters, the effects of surface functionalization have been observed by two unique measurement and evaluation techniques which have never been used for this evaluation, i.e., reduced resorption curves (RRCs) and voltage response method (VR). These methods (developed in our departments), extend the possibilities of measurement of composite dielectric responses related to DC voltage application, allow the facile comparability of different materials and could be used for dispersion level evaluation. This fact has been confirmed by X-ray diffraction analyses.

show abstract

Section: Improvement Of Epoxy Based Composites Insulating Propertiesmentioning

confidence: 90%

Magnesium Oxide Nanoparticles: Dielectric Properties, Surface Functionalization and Improvement of Epoxy-Based Composites Insulating Properties

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, its applications in electronic devices is becoming more extensive. 64 Figure 8 presents the frequencydependent dielectric properties of EP-MHHPA, DEP-MHHPA and AGDEP-MHHPA samples. The dielectric properties of epoxy resins are calculated based on the Debye equation (Equation 6).…”

Section: Dielectric Properties Of Cured Epoxy Resinsmentioning

confidence: 99%

Low‐dielectric constant and viscosity tetrafunctional bio‐based epoxy resin containing cyclic siloxane blocks

Yao

Xue

Meng

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

Bio-based epoxy resins with low-dielectric constant, low viscosity and excellent mechanical properties have great significance for the future of advanced electronic and microelectronic industries. Cyclosiloxane segment possesses low polarity, high-dissociation energy, and elevated molecular volume, thereby making it useful for the synthesis of materials with low dielectric constant and viscosity. Herein, a tetrafunctional eugenol-based epoxy resin (DEP) based on a cyclosiloxane structure was designed and prepared through a hydrosilylation reaction. Allyl glycidyl ether (AGE) was selected as a reference compound and generated a silylation epoxy resin (AGDEP). The viscosity of these siliconecontaining tetrafunctional epoxy monomers (< 0.315 PaÁs) was significantly lower than that of the conventional oil-based epoxy resin (14.320 PaÁs). After curing with methyl hexahydrophthalic anhydride (MHHPA), the dielectric constant of DEP-MHHPA was as low as 2.8 (10 MHz), which was superior to that of EP-MHHPA. Notably, the glass transition temperature (T g ) of DEP-MHHPA was as high as 100.3 C. The tensile strength and elongation at break of DEP-MHHPA were estimated to be 66.1 MPa and 6.0%, respectively.Multifunctional eugenol-based epoxy monomers with low-dielectric constant and viscosity provide an efficient guideline for building epoxy-based materials to better design future-oriented engineering materials.

show abstract

“…The use of silica nanoparticles in nanocomposites has been reported in the literature, mainly because they have good thermal, 5 electrical 6 and mechanical properties 7 . In addition, the incorporation of functionalized silica nanoparticles in polymeric matrices showed an increase in the dielectric strength of the nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Hydrophilic and hydrophobic silica‐based nanocomposites of chemically recyclable thermoset

Souza

Bello

Coelho

2022

Polymer International

View full text Add to dashboard Cite

In this study we evaluated the effect of the addition of hydrophilic and hydrophobic silica nanoparticles on the electrical properties of polyhexahydro‐s‐triazine (PHT), a new chemically recyclable thermoset produced from 2,2‐bis[4‐(4‐aminophenoxy)phenyl]propane and paraformaldehyde. Chemical recycling as well as thermal and mechanical properties were also investigated. Regarding the electrical properties, electrical conductivity near 10−8 S m−1 at 100 Hz and dielectric constant close to 4.00 at 1 kHz were observed for neat PHT polymer. Better results for electrical properties were observed with the addition of hydrophobic silica nanoparticles. After the addition of the highest concentration (4.5 wt%) the dielectric constant increased about 8% at 1 kHz. Concerning the thermal properties, PHT polymer exhibited a glass transition temperature (Tg) of 185 °C. The addition of hydrophilic or hydrophobic nanoparticles into the neat matrix did not lead to significant variations of thermal properties, but Tg values were decreased compared to the neat resin. Additionally, for mechanical properties, values of reduced modulus (4.58 GPa) and nanohardness (0.38 GPa) were observed. Besides, for all nanocomposites, there was an increase in the reduced modulus for all samples studied. Finally, the chemical recycling of both neat polymer and all nanocomposites after acid treatment was successfully characterized via NMR analysis. © 2021 Society of Industrial Chemistry.

show abstract

Influence of SiO2 nanoparticles and nanofibrous filler on the dielectric properties of epoxy-based composites

Cited by 19 publications

References 9 publications

Magnesium Oxide Nanoparticles: Dielectric Properties, Surface Functionalization and Improvement of Epoxy-Based Composites Insulating Properties

Magnesium Oxide Nanoparticles: Dielectric Properties, Surface Functionalization and Improvement of Epoxy-Based Composites Insulating Properties

Low‐dielectric constant and viscosity tetrafunctional bio‐based epoxy resin containing cyclic siloxane blocks

Hydrophilic and hydrophobic silica‐based nanocomposites of chemically recyclable thermoset

Contact Info

Product

Resources

About