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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Significantly improved dielectric performances of sandwich-structured polymer composites induced by alternating positive-k and negative-k layers
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Significantly improved dielectric performances of sandwich-structured polymer composites induced by alternating positive-k and negative-k layers

机译：通过交替的正-K和负-K层显着改善夹层结构聚合物复合材料的介电性能

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摘要

High-k polymer composites are promising candidates for energy-storage capacitors and many other electronic devices. However, balancing the permittivity, loss and breakdown strength remains a challenge for us. Herein, theoretical calculations and experimental studies were simultaneously carried out to develop an original design of sandwich-structured composites consisting of alternating negative-k and positive-k layers toward high performance dielectric applications. It is experimentally proved that the trilayered composites are capable of balancing the two contrasting parameters of permittivity and loss. The introduction of negative-k layers into trilayered composites leads to a higher dielectric constant (epsilon' approximate to 90@10 kHz) and low retained loss (tan delta approximate to 0.025@10 kHz) compared with those of the pristine PVDF (epsilon' approximate to 10@10 kHz, tan delta approximate to 0.020@10 kHz). Moreover, the trilayered composites possess an obviously improved energy-storage capacity which is nearly 3 times higher than those of traditional trilayered composites without negative-k layers. Although the permittivity boost effect is still far below the theoretically predicted results and the mechanisms need to be further clarified, these results undoubtedly validated the feasibility of our design, and multilayer high-k composites with fascinating dielectric performances are expected to emerge in the near future via tailoring the properties of single layers and stacking sequences.
机译：高k聚合物复合材料是储能电容器和许多其他电子设备的承诺候选者。然而，平衡介电常数，损失和故障实力对我们来说仍然是挑战。这里，同时进行理论计算和实验研究，以开发由交替的负-K和正-K层朝向高性能电介质应用组成的夹层结构复合材料的原始设计。实验证明了三层复合材料能够平衡介电常数和损失的两个对比度参数。将负k层引入三层复合材料，导致介电常数较高（Epsilon'近似为90 kHz），与原始PVDF（epsilon'相比，低保留损失（Tanδ近似为0.025 kHz）近似到10 kHz，Tan Delta近似为0.02020-10 kHz）。此外，三层复合材料具有明显改善的能量储存能力，其比没有负-K层的传统三叶层复合材料高几乎3倍。虽然允许增压效果仍然远远低于理论上预测的结果，但需要进一步澄清机制，但这些结果无疑验证了我们设计的可行性，并且预计具有迷人介电表演的多层高k复合材料将在不久的将来出现通过定制单层和堆叠序列的性质。

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