聚醚酰亚胺纳米复合电介质电导的Meyer-Neldel补偿特性研究

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中文摘要：电动汽车和航空航天等领域对极端高温条件下低能量损耗介电储能设备的需求不断增大，亟须开发耐高温的高性能介电储能材料。聚醚酰亚胺因高击穿强度和优越的热稳定性成为耐高温储能薄膜材料的首选，向其掺入纳米粒子是进一步降低高温损耗的有效途径。电导损耗作为能量损耗的主要形式之一，对其内在机理的研究具有重要的科学价值。为揭示纳米粒子掺杂对复合电介质电导特性的影响机理，以聚醚酰亚胺为基体制备了不同掺杂浓度的聚醚酰亚胺/二氧化硅纳米复合电介质。变温电导测试结果表明掺杂纳米粒子可有效降低电导率。采用空间电荷限制电流模型和跳跃电导模型对聚合物纳米复合电介质的变温电导特性进行分析，发现掺杂含量的改变并未引起聚合物中局域态分布形状的改变，表明纳米复合电介质中界面区和基体的电导特性具有一致性。进一步对聚合物纳米复合电介质电导的温度依赖性进行分析，发现其温度依赖性同时满足Arrhenius方程和Meyer-Neldel补偿规则，表明纳米复合电介质中的陷阱与聚合物基体具有相同的机制。根据有序紧密凝聚界面区模型，纳米粒子的掺入是通过降低界面区分子链的柔顺性使局域态能级加大，导致载流子迁移率降低，宏观上表现为电介质的电导率下降，能量损耗降低。

外文标题：Research on conductance Meyer-Neldel compensation of polyetherimide nanocomposites

外文摘要：The demand for energy storage equipment capable of achieving low energy loss at extremely high temperatures is growing in fields such as electric vehicles and aerospace.Therefore,developing high-temperature resistant and high-performance dielectric energy storage materials is urgently needed.Polyetherimide is the top choice for high-temperature-resistant energy storage thin films due to its high breakdown strength and superior thermal stability.Incorporating nanoparticles into polyetherimide is an effective way to further reduce high-temperature loss.As one of the main forms of energy loss,researching the internal mechanism of conductance loss is valuable.PEI/SiO2 nanocomposite dielectrics with varying doping contents are prepared to clarify the effect of nanoparticle doping on dielectric conductivity.The variable temperature conductivity test results reveal that doped nanoparticles can effectively reduce the conductivity.The space charge limited current model and jump conductance model are used to analyze the variable temperature conductance characteristics of polymer nanocomposite dielectrics.It is evident that the change in doping content does not affect the local state distribution shape in the polymer,indicating that the conductance characteristics of the interface region and substrate in the nanocomposite dielectrics remain consistent.The analysis focuses on the temperature dependence of polymer nanocomposite dielectric conductivity.It has been observed that the temperature dependence adheres to the Arrhenius equation and Meyer-Neldel compensation,suggesting that the traps in nanocomposite dielectrics function in the same way as the polymer matrix.The incorporation of nanoparticles increases the energy level of the local state through a reduction in the compliance of the molecular chain in the interface region,which is depicted in the schematic of the folded-chain fringed micellar grain model.This decreases carrier mobility,manifested as a reduction in dielectric conductivity and energy loss.

外文关键词：

nanocomposite dielectricpolyetherimideconductivity propertiesMeyer-Neldel compensationschematic diagram of folded-chain fringed micellar grain model

作者：

王泊心、闵道敏、段亚楠、武庆周、李盛涛、秦少瑞、朱胜龙

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作者单位：

西安交通大学电力设备电气绝缘国家重点实验室,西安 710049

中国工程物理研究院流体物理研究所,绵阳 621900

国网安徽省电力有限公司电力科学研究院,合肥 230061

关键词：

纳米复合电介质聚醚酰亚胺电导特性 Meyer-Neldel补偿规则有序紧密凝聚界面区模型

基金：

国家自然科学基金面上项目国家自然科学基金委员会与中国工程物理研究院联合基金项目

项目编号：

52077162U1830131

出版年：

2024

DOI：

10.1360/SST-2022-0311

中国科学(技术科学)

中国科学院

中国科学(技术科学)

CSTPCD北大核心

影响因子：0.752

ISSN：1674-7259

年,卷(期)：2024.54(6)

参考文献量30