In order to meet the requirements of polymer dielectric materials for high thermal stability and excellent dielectric properties in the application of high-temperature film capacitors, a series of polyimide (PI) films are fabricated by introducing a self-synthesized aniline trimer (ACAT) with a conjugated structure in this work. Since the conjugated ACAT in the main chains of PI improves the electron polarization and carrier mobility of the PI molecular chains, the dielectric constant of the ACAT-PI films is greatly enhanced (4.4–7.4). Meanwhile, the dissipation factor does not increase apparently (0.002–0.013). The dielectric properties are stable even when the temperature is up to 200 °C, the thermal degradation temperature is as high as 450 °C, and the mechanical properties are also excellent (70–105 MPa). Among all the films, the PI film with 5 mol% ACAT exhibits the maximal energy density of 3.6 J cm⁻³ under the field of 426 kV mm⁻¹, the high tensile strength (90 MPa) and the excellent thermal stability (T_d5 = 515 °C). The work paves the way to prepare high-temperature polymer dielectric film materials with high energy storage density.

中文翻译：

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用于高温聚合物薄膜电容器的含有共轭 ACAT 的优异聚酰亚胺电介质

为了满足高分子介电材料在高温薄膜电容器应用中对高热稳定性和优异介电性能的要求，通过引入自合成苯胺三聚体（ACAT），制备了一系列聚酰亚胺（PI）薄膜。这项工作中的共轭结构。由于PI主链中的共轭ACAT提高了PI分子链的电子极化和载流子迁移率，ACAT-PI薄膜的介电常数大大提高（4.4-7.4）。同时，损耗因数没有明显增加（0.002-0.013）。即使温度高达200°C，介电性能也稳定，热降解温度高达450°C，机械性能也优异（70-105 MPa）。在所有的电影中，^-3在426 kV mm ^-1场下，具有高拉伸强度（90 MPa）和优异的热稳定性（T _d5 = 515 °C）。该工作为制备具有高储能密度的高温聚合物介电薄膜材料铺平了道路。