Improvement of electrical insulation performance of silicone rubber cables due to exposure to heat and radiation

Ohki, Yoshimichi; Hirai, Naoshi; Tanaka, Yasuhiro

doi:10.1002/app.54595

Cited by 3 publications

(1 citation statement)

References 31 publications

(113 reference statements)

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“…With the continuous exploration of the Earth and extraterrestrial space, human beings are exposed to increasingly extreme environments, among which ultralow temperature conditions are one of the main challenges. − Silicone elastomers, characterized by exceptional resistance to high and low temperatures, − radiation, , and ultraviolet light, , as well as insulation, − air permeability, , and physiological inertness − properties, find widespread application in various fields, including electronic/electrical, aerospace, petrochemical, construction, transportation, and daily chemical industries. Notably, ethyl silicone rubber has attracted increasing attention as the elastomer material with the lowest known glass transition temperature. , Derived from the cross-linking of linear polydiethylsiloxane (PDES), with −Si–O–Si– as the main chain and –CH 2 CH 3 as the side group, ethyl silicone rubber exhibits a glass transition temperature of −145 °C.…”

Section: Introductionmentioning

confidence: 99%

Ternary Siloxane Copolymers Based Tough Elastomer under Ultralow Temperatures Condition

Ji,

Huang,

Dai

et al. 2024

ACS Appl. Polym. Mater.

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The preparation of tough elastomer materials for use in ultralow temperature environments (<−100 °C) has always been a challenge in materials science. Despite polydiethylsiloxane being recognized as a promising material, its crystallization at low temperatures (−75 °C) significantly limits its application under ultralow temperature conditions. In this study, we used simulation-assisted design to optimize a ternary random copolymerized silicone with a glass transition temperature of −149 °C, which is a potential candidate material to withstand ultralow temperature environments. We experimentally synthesized diethyl−dimethyl−diphenyl ternary random copolysiloxanes based on the insights obtained from molecular dynamics simulations. Differential scanning calorimetry experiments confirmed that the glass transition temperature of the ternary random copolymerized silicone was as low as −140 °C, and the crystallization was effectively suppressed. Low-temperature tensile experiments further showed that the elongation at break exceeded 200% at −110 °C, the toughness reached 27 MJ/m 3 , and the fracture energy reached 590 kJ/m 2 . At the ultralow temperature of −130 °C, the fracture energy of the material reached 650 kJ/m 2 , and the tear strength reached 52 kN/m, demonstrating exceptional tear resistance. This study provides a feasible solution for the preparation and engineering applications of elastomer materials resistant to ultralow temperatures.

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Section: Introductionmentioning

confidence: 99%

Ternary Siloxane Copolymers Based Tough Elastomer under Ultralow Temperatures Condition

Ji,

Huang,

Dai

et al. 2024

ACS Appl. Polym. Mater.

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Enhanced high‐temperature electrical properties and charge dynamics of inorganic/organic silicone elastomer nanocomposites via nanostructure grafting and molecular trap construction

Wang,

Tanaka,

Miyake

et al. 2024

Polymer Composites

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This study introduces a novel strategy to enhance the high‐temperature electrical performance of the silicone elastomer (SE), while ensuring control over its thermal and mechanical properties for SiC device packaging insulation application. For the same, the ultra‐low‐content inorganic/organic SE nanocomposites are prepared and tested (at room temperature and 150°C) by grafting polyhedral oligomeric silsesquioxane (POSS) nanofillers and doping organic semiconductors. It is found that grafting POSS nanofillers enhances the SE's thermal and mechanical properties. Moreover, doping the grafted SE with different organic semiconductors (ITIC, PCBM, and NTCDA) further improves its electrical properties and charge dynamics at 150°C. The optimal doping content for ITIC, PCBM, and NTCDA is found to be 0.05, 0.10, and 0.15 wt%, respectively. Among these, NTCDA exhibits superior electrical performance at 150°C. Particularly, compared to pure SE, NTCDA doping and POSS grafting reduce the electrical conductivity by an order of magnitude and increase the breakdown strength, charge hopping activation energy, and trap energy level by 65.5%, 0.20 eV and 0.73 eV, respectively. This study finds that organic semiconductors outperform nanostructures in inhibiting electron injection and immobilizing free electrons at high temperatures.Highlights Nano‐POSS grafting enhances material properties by reinforced molecular chains. Charge dynamics is studied by space charge and current integrated charge at HT. Organic semiconductors improve electrical properties and charge dynamics at HT. Organic semiconductors outperform nanofillers in immobilizing electrons at HT. The ideal organic semiconductor doping level correlates with its energy gap.

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Surface flashover in 50 years: II. Material modification, structure optimisation, and characteristics enhancement

Li,

Liu,

Ohki

et al. 2024

High Voltage

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Surface flashover is a gas–solid interface insulation failure that significantly jeopardises the secure operation of advanced electronic, electrical, and spacecraft applications. Despite the widespread application of numerous material modification and structure optimisation technologies aimed at enhancing surface flashover performance, the influence mechanisms of the present technologies have yet to be systematically discussed and summarised. This review aims to introduce various material modification technologies while demonstrating their influence mechanisms on flashover performances by establishing relationships among ‘microscopic structure‐mesoscopic charge transport‐macroscopic insulation failure’. Moreover, it elucidates the effects of chemical structure on surface trap parameters and surface charge transport concerning flashover performance. The review categorises and presents structure optimisation technologies that govern electric field distribution. All identified technologies highlight that achieving a uniform tangential electric field and reducing the normal electric field can effectively enhance flashover performance. Finally, this review proposes recommendations encompassing mathematical, chemical, evaluation, and manufacturing technologies. This systematic summary of current technologies, their influence mechanisms, and associated advantages and disadvantages in improving surface insulation performance is anticipated to be a pivotal component in flashover and future dielectric theory.

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Improvement of electrical insulation performance of silicone rubber cables due to exposure to heat and radiation

Cited by 3 publications

References 31 publications

Ternary Siloxane Copolymers Based Tough Elastomer under Ultralow Temperatures Condition

Ternary Siloxane Copolymers Based Tough Elastomer under Ultralow Temperatures Condition

Enhanced high‐temperature electrical properties and charge dynamics of inorganic/organic silicone elastomer nanocomposites via nanostructure grafting and molecular trap construction

Surface flashover in 50 years: II. Material modification, structure optimisation, and characteristics enhancement

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