Comparison of four commonly used high temperature vulcanized silicone rubber formulas for outdoor insulator and their regional adaptability

Lin, Ying; Wang, Liming; Yin, Fanghui; Farzaneh, M.; Wang, Kun; Gao, Siming

doi:10.1002/app.47477

Cited by 26 publications

(10 citation statements)

References 41 publications

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“…Indeed, the nanosilica has a high affinity for water, and the water adsorbed on its surface may disturb the synthesis of the polysiloxane during the preparation of nanocomposites. A higher amount of nanosilica will introduce a larger amount of water in the nanocomposites, which may break the siloxane linkages and reduce the crosslinking density [ 36 ]. More information on the thermal behavior and the mobility of the polymer chains in function of temperature were obtained from calorimetric and dielectric measurements.…”

Section: Resultsmentioning

confidence: 99%

“…However, the decrease of the degradation temperature was not proportional to the amount of nanosilica in the nanocomposites, suggesting contradictory effects. Thus, it may be supposed that this is the effect of the competitive actions of several factors: (i) the silanol groups on the surface of the nanosilica accelerated the thermal degradation, leading to low molecular weight cyclic products [ 50 ]; (ii) the nanosilica–polysiloxane interactions improved the dispersion of nanosilica and the thermal stability; (iii) the hydroxyl groups on the nanosilica surface favored the degradation of the siloxane linkage due to the adsorbed water [ 36 ]; and (iv) the adsorbed water on the surface of the nanoparticles also favored their agglomeration, leading to a poor dispersion in the polysiloxane and decreased thermal stability [ 36 ]. The presence of large nanosilica aggregates in E20 and E30 was demonstrated by SEM, and their presence may disturb the crosslinking process.…”

Section: Resultsmentioning

confidence: 99%

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Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices

et al. 2021

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Polymer nanodielectrics characterized by good flexibility, processability, low dielectric loss and high dielectric permittivity are materials of interest for wearable electronic devices and intelligent textiles, and are highly in demand in robotics. In this study, an easily scalable and environmentally friendly method was applied to obtain polysiloxane/nanosilica nanocomposites with a large content of nanofiller, of up to 30% by weight. Nanosilica was dispersed both as individual particles and as agglomerates; in nanocomposites with a lower amount of filler, the former prevailed, and at over 20 wt% nanosilica the agglomerates predominated. An improvement of both the tensile strength and modulus was observed for nanocomposites with 5–15 wt% nanosilica, and a strong increase of the storage modulus was observed with the increase of nanofiller concentration. Furthermore, an increase of the storage modulus of up to seven times was observed in the nanocomposites with 30 wt% nanosilica. The tensile modulus was well fitted by models that consider the aggregation of nanoparticles and the role of the interface. The dielectric spectra showed an increase of the real part of the complex relative permittivity with 33% for 30 wt% nanosilica in nanocomposites at a frequency of 1 KHz, whereas the loss tangent values were lower than 0.02 for all tested nanodielectrics in the radio frequency range between 1 KHz and 1 MHz. The polysiloxane–nanosilica nanocomposites developed in this work showed good flexibility; however, they also showed increased stiffness along with a stronger dielectric response than the unfilled polysiloxane, which recommends them as dielectric substrates for wearable electronic devices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices

et al. 2021

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“…This increase in dielectric breakdown strength can be ascribed to the trapping of the charge carriers at the interfacial boundaries of the filler and matrix which hinder the electrical treeing. [1] The dielectric breakdown in dielectrics can occur when the generated heat inside the material exposed to the electrical field overtakes the dissipated heat leading to a thermal runaway. This phenomenon is known as thermal breakdown and other mechanisms, such as electromechanical breakdown as well as partial discharge breakdown, can also lead to failure.…”

Section: Dielectric Spectroscopymentioning

confidence: 99%

“…Silicone rubber composites have received significant attention for the use in high-voltage outdoor insulating applications due to their remarkable properties, such as long durability, low maintenance cost, easy installation, and a broad range of regional applications. [1][2][3][4] Silicone rubber is known as a synthesis polymer with significant weather ability, remarkable resistance to ultraviolet (UV) degradation and noticeable resistance to oxidation. [3,[5][6][7] The low surface energy of silicone rubber gives suitable hydrophobicity for outdoor insulating applications.…”

Section: Introductionmentioning

confidence: 99%

Enhancement in electrical and thermal performance of high‐temperature vulcanized silicone rubber composites for outdoor insulating applications

Azizi

Momen

Ouellet-Plamondon

et al. 2020

J of Applied Polymer Sci

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High‐temperature vulcanized silicone rubber composites are highly desirable as outdoor insulating materials due to their immense thermal and electrical performance. The aim of this work is to study the role of co‐combined fillers (modified fumed silica [MFS], titanium dioxide [TiO2], with graphene [G]) on electrical and thermal properties of silicone rubber (S) composites. The dielectric response of S/MFS_10 phr and S/TiO2_20 composites tailored with 2 phr G was characterized by broadband dielectric spectroscopy. The hybrid filler/composites were found to show higher thermal stability when 2 phr G was added. In addition, a low quantity of G filler was found to slightly increase the AC dielectric breakdown strength of the S/MFS_10 and S/TiO2_20, where an improvement of 3 and 5% was found, respectively. Several steps were observed in the thermal decomposition of the S rubber composites by thermogravimetric analysis‐Fourier‐transform infrared spectroscopy. Our findings revealed great potentials for fabricating hybrid‐filler/silicone rubber composites with enhanced electrical and thermal properties for outdoor insulating applications.

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“…The electrical insulation materials play an important role in the insulation coordination of overhead power lines [1]. Their aging can cause potential risks to the safety and stability of power system.…”

Section: Introductionmentioning

confidence: 99%

Study on Detecting Dielectric Properties of Typical Electrical Insulation Materials by Terahertz Wave Spectroscopy

Mei

Yin

et al. 2020

IEEE Access

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The dielectric properties of the electrical insulation materials is of great importance to the safe operation of the power system. As a promising technique in the field of material testing and with the very adaptive physical modeling of wave transmission process, terahertz wave was used to measure the dielectric properties of five commonly used insulation materials by two methods in this paper. When excluding the echo pulse from the reference signal and the sample signal, a better signal-noise ratio and a wider effective frequency band of spectrums can be obtained. Alternatively, the dielectric properties can also be achieved by separating the main pulse and echo pulse from the sample signal. The latter method makes the sampling of reference signal unnecessary. Furthermore, the dielectric properties of materials were also measured on a relative lower frequency band (1Hz-1MHz) by the broadband dielectric spectrometer. Compared with a relatively lower frequency band, due to the polarization, the dielectric constant of the tested insulation materials was lower on the terahertz band while the dielectric loss tangent was generally higher except the epoxy resin.INDEX TERMS Broadband dielectric spectrometer, Dielectric properties, Insulation materials, Terahertz wave.

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Comparison of four commonly used high temperature vulcanized silicone rubber formulas for outdoor insulator and their regional adaptability

Cited by 26 publications

References 41 publications

Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices

Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices

Enhancement in electrical and thermal performance of high‐temperature vulcanized silicone rubber composites for outdoor insulating applications

Study on Detecting Dielectric Properties of Typical Electrical Insulation Materials by Terahertz Wave Spectroscopy

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