Inserting insulating barriers into conductive particle channels: A new paradigm for fabricating polymer composites with high dielectric permittivity and low dielectric loss
Inserting insulating barriers into conductive particle channels: A new paradigm for fabricating polymer composites with high dielectric permittivity and low dielectric loss
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将绝缘屏障插入导电颗粒通道：制造具有高介电常数和低介电损耗的聚合物复合材料的新范例
DOI：
10.1016/j.compscitech.2021.109070
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发表时间：
2021-11
影响因子：
9.1
通讯作者：
Chen Yuwei
中科院分区：
文献类型：
--
作者：
Wu Weifei;Liu Xueqing;Qiang Zhe;Yang Jiying;Liu Yuhong;Huai Kai;Zhang Bailang;Jin Shuxiang;Xia Yumin;Fu Kun Kelvin;Zhang Jianming;Chen Yuwei
高介电聚合物复合材料的一个长期的挑战是如何合理的结构设计，以提高介电常数，同时最小化介电损耗。通常，将导电颗粒添加到复合材料中通常导致由漏电流引起的介电损耗的增加，所述漏电流是由于在逾渗阈值处的“绝缘体-导体”转变。这项工作提出了一种策略，同时组装导电和绝缘粒子形成链状结构，基于偶极-偶极相互作用诱导的电场。具体而言，绝缘钛酸钡（BaTiO 3）颗粒可以巧妙地嵌入导电石墨通道中以用作屏障。这种形态的形成对于平衡导电填料/聚合物复合体系的高介电常数和相对低的介电损耗起着重要作用。仅用2.5wt%的石墨，介电常数可以在电场诱导组装时显著增强，同时介电损耗也不可避免地增加到396。通过加入额外的5重量%的钛酸钡（屏障），我们能够降低介电损耗低至0.19，而介电常数仍然保持相对较高（73.5）。这项工作提供了一个关键的材料设计概念的高性能柔性介电材料的基础上创建障碍，通过在三元复合材料中的电场的协助下，防止导电填料界面之间的漏电流的产生。
A longstanding challenge in fabricating high dielectric polymer composite is how to rationalize structure design to improve dielectric permittivity while minimizing dielectric loss. Typically, adding conductive particles in to the composite often leads to an increase in the dielectric loss caused by leakage current due to ‘insulator-conductor’ transition at the percolation threshold. This work presents a strategy for simultaneously assembling conductive and insulating particles to form chainlike structures, based on dipole-dipole interactions induced by electric fields. Specifically, insulating barium titanate (BaTiO3) particles can be subtly embeded in the conductive graphite channels to serve as barriers. The formation of such morphology plays an important role for balancing the high dielectric permittivity and relatively low dielectric loss for conductive fillers/polymer composite systems. With only 2.5 wt% graphite, the dielectric permittivity can be enhanced significantly upon electric field induced assembly, while the dielectric loss also inevitably increases to 396. By incorporating additional 5 wt% BaTiO3(barriers), we are able to reduce the dielectric loss to as low as 0.19 while the dielectric permittivity still remains relatively high (73.5). This work provides a critical material design concept for high-performance flexible dielectric materials based on creating barriers through the assistance of electric fields in ternary composites, which prevents the generation of leakage current between conductive fillers interfaces.
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影响因子：
2.8
作者：
A. Barbosa;L. D. da Silva;J. Abenojar;M. Figueiredo;A. Öchsner
通讯作者：
A. Barbosa;L. D. da Silva;J. Abenojar;M. Figueiredo;A. Öchsner
钛酸钡偏析石墨烯片用于高介电常数和超低损耗角正切聚偏二氟乙烯复合材料
DOI：
10.1016/j.compositesa.2015.08.031
发表时间：
2015-11-01
影响因子：
8.7
作者：
Li, Yuhan;Shi, Yunjie;Fu, Qiang
通讯作者：
Fu, Qiang
影响因子：
4.5
作者：
Fei Wang;Haoyu Wang;J. Mao
通讯作者：
Fei Wang;Haoyu Wang;J. Mao
影响因子：
9.5
作者：
Fang Peng;Keke Chen;Armen Yildirim;Xuhui Xia;B. Vogt;M. Cakmak
通讯作者：
Fang Peng;Keke Chen;Armen Yildirim;Xuhui Xia;B. Vogt;M. Cakmak
影响因子：
6.7
作者：
Batra, Saurabh;Cakmak, Miko
通讯作者：
Cakmak, Miko