Repurposing Poly(3‐hexylthiophene) as a Conductivity‐Reducing Additive for Polyethylene‐Based High‐Voltage Insulation

Pourrahimi, Amir Masoud; Kumara, Sarath; Palmieri, F.; Yu, Liyang; Lund, Anja; Hammarström, Thomas; Hagstrand, P.‐O.; Scheblykin, Ivan G.; Fabiani, Davide; Xu, Xiangdong; Müller, Christian

doi:10.1002/adma.202100714

Cited by 32 publications

(24 citation statements)

References 39 publications

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“…The activation energy of the epoxy composite (0.9 eV) is lower than that of pure epoxy (1.20 eV) at a high temperature. The mobility of polymer molecular chains at the interface area in the composite is inhibited due to the steric hindrance effect of nano− and micro fillers, which equally introduces deep trapping sites at the interface area; thus, ionic charge transport in the composite is suppressed compared to the pure polymer [ 24 , 25 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Temperature on the Charge Transport Behavior of Epoxy/Nano−SiO2/Micro−BN Composite

2022

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Thermally conductive epoxy resin composites are widely used as electrical equipment insulation and package materials to enhance heat dissipation. It is important to explore the dielectric properties of the composites at high temperatures for the safe operation of the equipment. This paper investigated the charge transport behavior of an epoxy/nano−SiO2/micro−BN composite at varied temperatures by combined analysis of the TSDC (thermally stimulated current), conduction current, complex permittivity and space charge distribution between 40 and 200 °C. The results show that ionic space charge accumulation was significantly suppressed in the composite at high temperatures. The conduction current increased gradually with temperature and manifested a remarkable shift from electron charge transport to ion charge transport near the glass transition temperature (Tg). The real and imaginary permittivity showed an enormous increase above Tg for both the epoxy resin and the composite. The conduction current and permittivity of the composite were remarkably reduced in comparison to the epoxy resin. Therefore, the ionic process dominated the high temperature dielectric properties of the epoxy resin and the composite. The nano–micro fillers in the composite can significantly inhibit ion transport and accumulation, which can significantly enhance the dielectric properties of epoxy resin. Thus, the nano–micro composite has a strong potential application as a package material and insulation material for electronic devices and electrical equipment operated at high temperatures.

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Section: Resultsmentioning

confidence: 99%

Effect of Temperature on the Charge Transport Behavior of Epoxy/Nano−SiO2/Micro−BN Composite

2022

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“…9 Pourrahimi et al found that the electrical conductivity of the LDPE decreased by three times by adding an extremely low content of poly-3 hexylthiophene (P3HT), which is the highest reduction reported so far. 10 Jarvid et al explored the influence of alkyl side chain length on the electrical tree suppression of different benzoyl-based voltage stabilizers and found that the shortest side chain had the strongest effect. 11 Adding different aromatic compounds into XLPE showed that voltage stabilizers with high electron affinity can significantly inhibit space charge injection 12,13 and electrical tree inception.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al found that the DC breakdown strength of XLPE can be improved at different temperatures by grafting aromatic ketone compounds due to latters' excellent quantum chemical properties 9 . Pourrahimi et al found that the electrical conductivity of the LDPE decreased by three times by adding an extremely low content of poly‐3 hexylthiophene (P3HT), which is the highest reduction reported so far 10 . Jarvid et al explored the influence of alkyl side chain length on the electrical tree suppression of different benzoyl‐based voltage stabilizers and found that the shortest side chain had the strongest effect 11 .…”

Section: Introductionmentioning

confidence: 99%

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Hong

Chen

Zhu

et al. 2022

J of Applied Polymer Sci

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The effect of adding electron-buffering voltage stabilizer (1 wt% maminobenzoic acid) on the electrical tree-induced degradation of cross-linked polyethylene (XLPE) was studied at high temperatures. The electrical tree inception, growth, and partial discharge characteristics were simultaneously analyzed at 30, 50, and 70 C, respectively. The results showed that the growth rate of electrical tree and partial discharge activity as well as the discharge repetition rate, significantly increased with the temperature for pure XLPE and XLPE stabilizer blend. However, the XLPE stabilizer blend exhibited higher tree inception voltage, lower tree growth rate, and partial discharge activity than pure XLPE. The addition of the voltage stabilizer reduced the carbon layer thickness in the tree channel and offered higher resistance to the electrical tree growth. Surface potential decay demonstrated that the voltage stabilizer addition decreased the trap energy level, but increased the shallow trap density of the XLPE. Quantum chemical calculations showed that the voltage stabilizer enhanced the ability to buffer the high-energy electrons in the XLPE. A high-energy electron buffering mechanism was also proposed to explain the effect of voltage stabilizer on the electrical treeing and partial discharge activity in the XLPE at high temperatures.

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“…In recent years, numerous studies have enhanced the breakdown field strength, by introducing nanoparticles into polymers through physical blending or chemical deposition, [7][8][9][10][11][12] multicomponent organic material blending, [13] and magnetron sputtering coating. [14] These have improved the electrical properties of materials to some extent and achieved landmark achievements.…”

Section: Introductionmentioning

confidence: 99%

Super Electrical Insulating Materials Based on Honeycomb‐Inspired Nanostructure: High Electrical Strength and Low Permittivity and Dielectric Loss

Sun

Sima

et al. 2021

Adv Elect Materials

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The high breakdown field strength is the most important index to evaluate the performance of insulating materials. It is theoretically found that the breakdown field strength of dielectric samples can be significantly improved by up to 1–2 orders of magnitude by constructing nanopore structures. Thus, bridged silsesquioxane super electrical insulating materials (BSSEIM) are developed with nanosized pore structures and their extremely high electrical insulation performance is realized. The results indicate that the breakdown field strength of the BSSEIM is dramatically higher than aluminosilicate fiber insulating materials (ASFIM) by 570.5% for dry samples and 118.1% for oil‐impregnated samples. Specifically, the prepared BSSEIM samples have excellent dielectric performances with permittivity and dielectric losses that are only 51.3% and 1.1% of ASFIM, which are significantly lower than most existing insulating materials. Finally, the theoretical analysis indicates that the nanopore structures can effectively limit the scale of the head size for an electron avalanche and significantly reduce the number of effective gas molecules by dividing the gas into nanounits. This significantly inhibits the ionization of gas molecules and improves the breakdown field strength of samples. This discovery overturns previous understandings of traditional insulating materials and opens an avenue toward super electrical insulating materials.

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Repurposing Poly(3‐hexylthiophene) as a Conductivity‐Reducing Additive for Polyethylene‐Based High‐Voltage Insulation

Cited by 32 publications

References 39 publications

Effect of Temperature on the Charge Transport Behavior of Epoxy/Nano−SiO2/Micro−BN Composite

Effect of Temperature on the Charge Transport Behavior of Epoxy/Nano−SiO2/Micro−BN Composite

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Super Electrical Insulating Materials Based on Honeycomb‐Inspired Nanostructure: High Electrical Strength and Low Permittivity and Dielectric Loss

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