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通过调整界面电子陷阱特性提高环氧树脂/POSS纳米复合材料的直流击穿强度

Improvement of DC Breakdown Strength of the Epoxy/POSS Nanocomposite by Tailoring Interfacial Electron Trap Characteristics.

作者信息

Aslam Farooq, Li Zhen, Qu Guanghao, Feng Yang, Li Shijun, Li Shengtao, Mao Hangyin

机构信息

State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, No. 28 Xianning West Road, Xi'an 710049, China.

State Grid of Zhejiang Electric Power Co., Ltd., 347 Jiangjun Road, Hangzhou 310007, China.

出版信息

Materials (Basel). 2021 Mar 8;14(5):1298. doi: 10.3390/ma14051298.

DOI:10.3390/ma14051298
PMID:33800474
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7962956/
Abstract

To date, breakdown voltage is an underlying risk to the epoxy-based electrical high voltage (HV) equipment. To improve the breakdown strength of epoxy resin and to explore the formation of charge traps, in this study, two types of polyhedral oligomeric silsesquioxane (POSS) fillers are doped into epoxy resin. The breakdown voltage test is performed to investigate the breakdown strength of neat epoxy and epoxy/POSS composites. Electron traps that play an important role in breakdown strength are characterized by thermally stimulated depolarized current (TSDC) measurement. A quantum chemical calculation tool identifies the source of traps. It is found that adding octa-glycidyl POSS (OG-POSS) to epoxy enhances the breakdown strength than that of neat epoxy and epoxycyclohexyl POSS (ECH-POSS) incorporated epoxy. Moreover, side groups of OG-POSS possess higher electron affinity () and large electronegativity that introduces deep-level traps into epoxy resin and restrain the electron transport. In this work, the origin of traps has been investigated by the simulation method. It is revealed that the functional properties of POSS side group can tailor an extensive network of deep traps in the interfacial region with epoxy and enhance the breakdown strength of the epoxy/POSS nanocomposite.

摘要

迄今为止，击穿电压是环氧基高压电气设备的一个潜在风险。为了提高环氧树脂的击穿强度并探索电荷陷阱的形成，在本研究中，将两种类型的多面体低聚倍半硅氧烷（POSS）填料掺杂到环氧树脂中。进行击穿电压测试以研究纯环氧树脂和环氧/POSS复合材料的击穿强度。通过热刺激去极化电流（TSDC）测量来表征在击穿强度中起重要作用的电子陷阱。使用量子化学计算工具确定陷阱的来源。研究发现，向环氧树脂中添加八缩水甘油基POSS（OG-POSS）比添加环氧环己基POSS（ECH-POSS）的环氧树脂能提高击穿强度。此外，OG-POSS的侧基具有更高的电子亲和力（）和大的电负性，这会在环氧树脂中引入深能级陷阱并抑制电子传输。在这项工作中，通过模拟方法研究了陷阱的起源。结果表明，POSS侧基的功能特性可以在与环氧树脂的界面区域定制广泛的深陷阱网络，并提高环氧/POSS纳米复合材料的击穿强度。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/b0417267346d/materials-14-01298-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/fb3fc8d30489/materials-14-01298-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/64aaef592e97/materials-14-01298-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/b41800077c5d/materials-14-01298-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/b0417267346d/materials-14-01298-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/55621db2f4fb/materials-14-01298-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/2781d7382eea/materials-14-01298-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/da0bb2f81614/materials-14-01298-g003.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/552045f288f2/materials-14-01298-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/fb3fc8d30489/materials-14-01298-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/64aaef592e97/materials-14-01298-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/b41800077c5d/materials-14-01298-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/e2417dd7093a/materials-14-01298-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/d8b9f4614485/materials-14-01298-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/35522da536ee/materials-14-01298-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/748a/7962956/b0417267346d/materials-14-01298-g013.jpg

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