Dielectric breakdown strength of epoxy bimodal-polymer-brush-grafted core functionalized silica nanocomposites
Dielectric breakdown strength of epoxy bimodal-polymer-brush-grafted core functionalized silica nanocomposites
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DOI：
10.1109/tdei.2014.004415
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发表时间：
2014-04
影响因子：
3.1
通讯作者：
S. Virtanen;T. Krentz;J. K. Nelson;L. Schadler;Michael Bell;B. Benicewicz;H. Hillborg;Su Zhao
中科院分区：
文献类型：
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作者：
S. Virtanen;T. Krentz;J. K. Nelson;L. Schadler;Michael Bell;B. Benicewicz;H. Hillborg;Su Zhao
介电纳米复合材料设计的中心目标是在基体聚合物和纳米填料之间产生大的界面面积，并使用它来定制复合材料的性能。界面可以产生用于捕获电子的位点，从而导致增加的介电击穿强度（DBS）。使用配体工程产生具有共价锚定分子的双峰群体的纳米颗粒。电活性短分子（低聚噻吩或二茂铁）和基质相容的长聚（甲基丙烯酸缩水甘油酯）（PGMA）链组成的双峰刷。介电击穿强度从凹进的样品和介电光谱被用来研究作为频率的函数的介电常数和损耗进行评估。介电击穿强度和介电常数显著增加，只有2重量%的填料加载，而介电损耗保持可比的参考环氧树脂。
The central goal of dielectric nanocomposite design is to create a large interfacial area between the matrix polymer and nanofillers and to use it to tailor the properties of the composite. The interface can create sites for trapping electrons leading to increased dielectric breakdown strength (DBS). Nanoparticles with a bimodal population of covalently anchored molecules were created using ligand engineering. Electrically active short molecules (oligothiophene or ferrocene) and matrix compatible long poly(glycidyl methacrylate) (PGMA) chains comprise the bimodal brush. The dielectric breakdown strength was evaluated from recessed samples and dielectric spectroscopy was used to study the dielectric constant and loss as a function of frequency. The dielectric breakdown strength and permittivity increased considerably with only 2 wt% filler loading while the dielectric loss remained comparable to the reference epoxy.