Abstract This work unravels and sheds light on interphase formation in epoxy alumina nanocomposites. To probe interphase and its affiliation with dielectric properties, three kinds of samples are investigated viz. neat epoxy, nanocomposites (using surface treated nanofillers), and nanocomposites (with untreated nanofillers). Characteristics information received from thermogravimetric analysis and dielectric properties measurements insinuates a change in chemistry and molecular mobility at the filler matrix interfaces. Using chemical structure of different constituent phases and FTIR spectroscopic analysis a chemical interactive model is presented to elicit interphase formation in composites. The impact of interfacial interaction on long term performance of the nanodielectrics is examined by conducting endurance tests under divergent ac stress. Nanocomposites exhibit a clear superior erosion resistance over the neat polymer. Under the application of cyclic non uniform ac stress, progressive erosion is likely to initiate and grow from high stress regions. Nanofillers may act as an obstacle and force the eroded channels to move through a zig-zag path. Additionally, surface treated nanofillers owing to their strong chemical bonding with polymer matrix expected to retard damage process by alleviating fatigue and distributing electromechanical stress between filler and polymer matrix. The results of this study show compelling evidence of interphases and their prominence on dielectric properties. Moreover, this study provides an intellectual foundation to vivify how engineering the chemistry of the interfaces may help in designing nanodielectrics with enhanced functionalities.

中文翻译：

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环氧树脂-氧化铝纳米复合材料介电性能的界面形成和伴随变化的证据

摘要 这项工作揭示并阐明了环氧氧化铝纳米复合材料中界面的形成。为了探究界面相及其与介电特性的关系，研究了三种样品，即。纯环氧树脂、纳米复合材料（使用表面处理过的纳米填料）和纳米复合材料（使用未经处理的纳米填料）。从热重分析和介电特性测量中获得的特性信息暗示了填料基体界面处化学和分子迁移率的变化。使用不同组成相的化学结构和 FTIR 光谱分析，提出了一种化学相互作用模型，以诱导复合材料中的界面形成。通过在不同的交流应力下进行耐久性测试来检查界面相互作用对纳米电介质长期性能的影响。纳米复合材料表现出明显优于纯聚合物的耐腐蚀性。在循环非均匀交流应力的应用下，渐进侵蚀很可能从高应力区域开始并增长。纳米填料可作为障碍物并迫使被侵蚀的通道通过锯齿形路径移动。此外，表面处理过的纳米填料由于与聚合物基体的强化学键合，有望通过减轻疲劳和在填料和聚合物基体之间分布机电应力来延缓损坏过程。这项研究的结果显示了令人信服的证据，证明了界面相及其对介电性能的突出作用。此外，这项研究提供了一个知识基础，可以使界面化学工程如何帮助设计具有增强功能的纳米电介质。