Abstract Dielectric polymer nanocomposites with high dielectric permittivity and low dielectric loss have great applications in energy storage field. In this study, a series of PVDF/MXene nanocomposites was prepared by solution method. The surface of MXene was functionalized with cetyltrimethylammonium bromide (MXene@CTAB) to achieve better dispersion in poly(vinylidene fluoride) (PVDF) matrix. The results revealed that the MXene@CTAB dispersed uniformly and had a good compatibility with PVDF matrix. In addition, the dynamical rheological test revealed that the viscosity and storage modulus of PVDF nanocomposites increased with the increasing of MXene@CTAB loading. The PVDF/MXene@CTAB nanocomposite containing 7 wt% MXene@CTAB exhibited a dielectric permittivity of 82.1 and a loss factor as low as 0.2 at 1 kHz. The presence of CTAB could serve as an insulating layer to suppress dielectric loss and AC conductivity of PVDF nanocomposites simultaneously. The PVDF/MXene@CTAB nanocomposite with high dielectric permittivity may find potential applications in energy storage capacitors for electronics. Moreover, the addition of MXene@CTAB contributed to the formation of Beta phase of PVDF.

中文翻译：

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具有可调介电常数的聚偏二氟乙烯纳米复合材料的二维 MXene 表面处理

摘要 具有高介电常数和低介电损耗的介电聚合物纳米复合材料在储能领域有着广泛的应用。本研究采用溶液法制备了一系列 PVDF/MXene 纳米复合材料。MXene 的表面用十六烷基三甲基溴化铵 (MXene@CTAB) 进行了功能化，以在聚偏二氟乙烯 (PVDF) 基质中实现更好的分散。结果表明，MXene@CTAB 分散均匀，与 PVDF 基体具有良好的相容性。此外，动态流变测试表明，PVDF 纳米复合材料的粘度和储能模量随着 MXene@CTAB 负载量的增加而增加。含有 7 wt% MXene@CTAB 的 PVDF/MXene@CTAB 纳米复合材料的介电常数为 82.1，1 kHz 时的损耗因数低至 0.2。CTAB的存在可以作为绝缘层同时抑制PVDF纳米复合材料的介电损耗和交流电导率。具有高介电常数的 PVDF/MXene@CTAB 纳米复合材料可能在电子产品的储能电容器中找到潜在的应用。此外，MXene@CTAB 的加入有助于 PVDF β 相的形成。