Although many polymers exhibit excellent dielectric performance including high energy density with high efficiency at room temperature, their electric and dielectric performance deteriorates at high temperatures (~150°C). Here, we show that nanofillers at very low volume content in a high-temperature (high-glass transition temperature) semicrystalline dipolar polymer, poly(arylene ether urea), can generate local structural changes, leading to a marked increase in both dielectric constant and breakdown field, and substantially reduce conduction losses at high electric fields and over a broad temperature range. Consequently, the polymer with a low nanofiller loading (0.2 volume %) generates a high discharged energy density of ca. 5 J/cm3 with high efficiency at 150°C. The experimental data reveal microstructure changes in the nanocomposites, which, at 0.2 volume % nanofiller loading, reduce constraints on dipole motions locally in the glassy state of the polymer, reduce the mean free path for the mobile charges, and enhance the deep trap level.

中文翻译：

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一种高度可扩展的介电超材料，在宽温度范围内具有出色的电容器性能。

尽管许多聚合物在室温下均表现出出色的介电性能，包括高能量密度和高效率，但它们的电和介电性能却在高温（〜150°C）下恶化。在这里，我们表明，在高温（高玻璃化转变温度）半结晶双极性聚合物聚亚芳基醚脲中，纳米填料的体积含量非常低，可以产生局部结构变化，从而导致介电常数和介电常数均显着增加。击穿场，并显着降低高电场和宽温度范围内的传导损耗。因此，具有较低的纳米填料负载量（0.2体积％）的聚合物会产生约2,000的高放电能量密度。在150°C时具有5 J / cm3的高效率。实验数据表明，纳米复合材料的微观结构发生了变化，