The mechanisms of hydrophobic recovery of polydimethylsiloxane elastomers exposed to partial electrical discharges
The mechanisms of hydrophobic recovery of polydimethylsiloxane elastomers exposed to partial electrical discharges
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DOI：
10.1006/jcis.2001.7909
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发表时间：
2001-12-01
影响因子：
9.9
通讯作者：
Orbeck, T
中科院分区：
文献类型：
--
作者：
Kim, J;Chaudhury, MK;Orbeck, T
有机硅弹性体暴露在放电条件下可呈现亲水性，其疏水性的丧失与表面上放电脉冲的能级和次数有关。然而，硅酮表面具有恢复疏水性和提高聚合物绝缘体性能的独特能力。大多数关于弹性体表面疏水性损失和恢复的研究都是在恶劣的使用条件下经历的高放电能量下进行的。尽管进行了大量的研究，但在低能量部分放电下疏水性丧失和恢复的机制尚未完全阐明。目前的研究是在10-10000 pC范围内的局部放电脉冲和使用针对平面电极配置完成的。在非常低的能量脉冲水平下，恢复主要是由于先前存在的流体从体块迁移到弹性体表面。在较高水平的部分排放中，流体不再发挥同样的作用，但采收率的主要机制变成了弹性体中原位产生的低分子量（LMW）物质的迁移。这些研究是在干燥和潮湿的条件下进行的。(C) 2001学术出版社。
Silicone elastomers exposed to electrical discharges can be rendered hydrophilic, and the loss of water repellency is related to the energy level and number of the discharge pulses on the surface. However, the silicone surface has the unique ability to recover the hydrophobicity and enhance the performance of a polymer insulator. Most of the studies of the loss and recovery of hydrophobicity on elastomer surfaces have been carried out at high discharge energies experienced under severe service conditions. Despite numerous studies, the mechanisms contributing to the loss and recovery of hydrophobicity under lower energy partial discharges are not fully elucidated. The current study was done with partial discharge pulses in the range 10-10000 pC and by using a needle-to-plane electrode configuration. At very low levels of energy pulses, the recovery is primarily caused by the migration of preexisting fluids from the bulk to the surface of the elastomer. At higher levels of partial discharges, the fluids no longer play the same role, but the dominant mechanism in the recovery becomes the migration of in situ produced low molecular weight (LMW) species in the elastomer. These studies were done under dry and wet conditions. (C) 2001 Academic Press.