电压稳定器改性三元乙丙橡胶的抗电树性能和热电荷载体耗散机制

IF 1.8 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY ECS Journal of Solid State Science and Technology Pub Date : 2024-04-17 DOI:10.1149/2162-8777/ad3c26
Zhongyuan Li, Jian Zhang, Lei Wang, Heqian Liu, Shiyu Chen, Minhu Xu, Hongda Yang, Jianquan Liang, Wei-Feng Sun
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引用次数: 0

摘要

为了提高用于电缆附件增强绝缘的乙丙橡胶(EPDM)材料的抗电树性能和介电击穿强度,采用了两种特定的芳香族酮化合物--乙烯基苯丙酮(VPE)和 4-丙烯氧基-2-羟基二苯甲酮(AOHBP)作为化学接枝改性的电压稳定剂。通过加速电树老化实验、交流介电击穿试验、表面电位阱级分析和第一原理计算,研究了改性三元乙丙橡胶材料的电树电阻和绝缘性能及其热电子抑制的电荷捕获机理。结果表明,两种电压稳定剂都能有效地提高电晶树的萌发电压和介电击穿强度,从而使电晶树的形貌高度扩展,电晶树的生长尺寸变小,其中 AOHBP 的作用更为显著。在三元乙丙橡胶的热化学交联反应中,这两种电压稳定剂被成功接枝到三元乙丙橡胶分子链上,引入了多个浅层电荷阱,从而降低了电荷载流子阱释放的能量,从而缓解了三元乙丙橡胶的电树老化。AOHBP 和 VPE 具有较高的电子亲和力和较小的电子能隙,能够吸收热电荷载流子的动能,同时限制欧杰电子激发。尤其是稳压器中的苯基使浅层电荷阱比深层电荷阱具有更大的载流子捕获截面,同时具有与电子跃迁能相似的高原子振动频率,从而有效地耗散了热电荷载流子的动能。这种机理在提高三元乙丙橡胶的抗电强度和绝缘强度方面起着主导作用。本研究证明了稳压器在改善三元乙丙橡胶材料绝缘性能方面的重要作用,并揭示了热电荷载流子限制电树生长的制冷机制,为开发高绝缘电缆附件材料提供了重要的化学改性策略。
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Electric-Tree Resistant Performance and Thermal Charge-Carrier Dissipation Mechanism of Voltage Stabilizer-Modified EPDM
In order to improve electric-tree resistant performance and dielectric breakdown strength of ethylene-propylene-diene misch-polymere (EPDM) material used for cable accessory reinforce insulation, the two specific aromatic ketone compounds—vinylphenylacetone (VPE) and 4-propylene oxyxy-2-hydroxydibenzenone (AOHBP) are employed as two paradigms of voltage stabilizer for chemical-graft modifications. Electric-tree resistances and insulation performances of modified EPDM materials and their charge trapping mechanism of thermoelectron inhibitions are studied by the accelerated electric-tree aging experiments, alternating current (AC) dielectric breakdown tests, surface potential trap-level analyses and first-principles calculations. Both the two species of voltage stabilizers are effective for promoting electric-tree inception voltage and dielectric breakdown strength, leading to a high extension of electric-tree morphology and smaller dimension of electric-trees growth, in which AOHBP is more significant. The two species of voltage stabilizers have been successfully grafted onto EPDM molecular-chains in thermal-chemistry crosslinking reactions of EPDM, introducing multiple shallow levels of charge traps, which reduces the energy released by trapping charge carriers and thus alleviates electric-tree aging of EPDM. The AOHBP and VPE represent a high electron affinity and a small electronic energy gap, which is competent of assimilating the kinetic energies of hot charge carriers whilst restricting Auger electronic excitation. Especially, the benzene group in voltage stabilizer renders shallow level charge traps with a larger carrier capture cross-section than deep traps and simultaneously possesses the high atomic vibration frequencies similar as electronic-transition energies, which results in effective dissipation on the kinetic energies of hot charge carriers. This mechanism dominates to increase electric-tree resistance and insulation strength of EPDM. The present study proves the important role of voltage stabilizers in improving insulation performance of EPDM material, and reveals the refrigeration mechanism on hot charge carriers for restricting electric-tree growth, which provides a significant strategy of chemical modifications for developing high-insulation cable accessory materials.
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来源期刊
ECS Journal of Solid State Science and Technology
ECS Journal of Solid State Science and Technology MATERIALS SCIENCE, MULTIDISCIPLINARY-PHYSICS, APPLIED
CiteScore
4.50
自引率
13.60%
发文量
455
期刊介绍: The ECS Journal of Solid State Science and Technology (JSS) was launched in 2012, and publishes outstanding research covering fundamental and applied areas of solid state science and technology, including experimental and theoretical aspects of the chemistry and physics of materials and devices. JSS has five topical interest areas: carbon nanostructures and devices dielectric science and materials electronic materials and processing electronic and photonic devices and systems luminescence and display materials, devices and processing.
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