Abstract Nanocomposites having multifunctional properties with simultaneous improvement in thermal, mechanical and dielectric properties along with improved ferroelectric signature are of considerable interest due to the rapidly growing need in the technological aspect. In the present work, microwave reduced graphene oxide (mRGO)/fluoroelastomer nanocomposites with enhanced dielectric performance and ferroelectric characteristics were developed. mRGO was synthesized from natural graphite via GO and was confirmed by analyzing the chemical changes using X-ray diffraction technique, Fourier transform infrared and Raman spectroscopy studies. The addition of the mRGO improved the mechanical, dielectric and ferroelectric characteristics of the nanocomposites by its better dispersion in the polymer matrix as confirmed by TEM and AFM analysis. The enhanced polymer filler interaction was also confirmed by analyzing the Kraus Plot. Nanocomposite with 0.75 phr of filler loading showed optimum mechanical properties with increased Tg of about −12.25 °C. This is an evidence for the enhancement in properties due to the improved filler-polymer electrostatic interaction. Nanocomposites showed several-fold increase in the dielectric constant value compared to the gum sample. Moreover, the nanocomposites have minimum dielectric loss at 1 MHz frequency. The incorporation of mRGO created a conductive pathway by the microcapacitor effect and the nanocomposites showed enhanced AC conductivity. Ferroelectric studies revealed that the coercive field (Ec) and the remnant polarization (Pr) of the nanocomposites were increased with filler loading that signifies the improvement in ferroelectric signature of the nanocomposites. The samples show excellent dielectric and ferroelectric properties along with better thermal and mechanical stability, and hence, will be promising candidate for ultra-modern storage devices.

中文翻译：

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具有优异热、机械和电性能的柔性 FKM/mRGO 纳米复合材料

摘要 由于技术方面的需求迅速增长，具有多功能特性、同时改善热、机械和介电特性以及改善铁电特征的纳米复合材料引起了相当大的兴趣。在目前的工作中，开发了具有增强介电性能和铁电特性的微波还原氧化石墨烯 (mRGO)/含氟弹性体纳米复合材料。mRGO 是由天然石墨通过 GO 合成的，并通过使用 X 射线衍射技术、傅里叶变换红外和拉曼光谱研究分析化学变化来证实。通过 TEM 和 AFM 分析证实，mRGO 的添加改善了纳米复合材料在聚合物基质中的分散性，从而改善了纳米复合材料的机械、介电和铁电特性。通过分析克劳斯图也证实了增强的聚合物填料相互作用。填充量为 0.75 phr 的纳米复合材料表现出最佳机械性能，Tg 增加约 -12.25 °C。这是由于改进的填料-聚合物静电相互作用而提高性能的证据。与口香糖样品相比，纳米复合材料的介电常数值增加了几倍。此外，纳米复合材料在 1 MHz 频率下具有最小的介电损耗。mRGO 的掺入通过微电容器效应创建了导电通路，纳米复合材料显示出增强的交流电导率。铁电研究表明，纳米复合材料的矫顽场 (Ec) 和剩余极化 (Pr) 随填料加载而增加，这表明纳米复合材料的铁电特征有所改善。这些样品显示出优异的介电和铁电性能以及更好的热和机械稳定性，因此将成为超现代存储设备的有希望的候选者。