EXPERIMENTAL INVESTIGATION OF THE MECHANISMS UNDERLYING SUPERIOR DIELECTRIC PROPERTIES OF POLYMER NANOCOMPOSITES

纳米填料添加对几个介电性能的影响进行了评估，为各种聚合物纳米复合材料。SiO_2纳米填料的加入对环氧树脂的电导率没有影响，而AlO（OH）纳米填料的加入使环氧树脂的电导率有所提高。在聚酰胺的情况下，载流子传输受到纳米填料加载的限制，并且对于几个弛豫过程，弛豫时间因纳米填料加载而变得更长。在每个松弛所涉及的分子运动似乎受到纳米填料加载的限制。光致发光和吸收光谱表明，本地化的国家不诱导的纳米填料加载。此外，紫外吸收和太赫兹光谱得到各种电绝缘材料和分配的一些观察到的峰进行了基于密度泛函理论的数值计算。

Effects of nanofiller addition on several dielectric properties were evaluated for various polymer nanocomposites. Conductivity of epoxy resin is unchanged by the SiO_2 nanofiller loading, but it increases if AlO(OH) nanofillers. In the case of polyamide, carrier transport is restricted by the nanofiller loading and the relaxation time becomes longer by the nanofiller loading for several relaxation processes. Molecular motions involved in each relaxation seem to be restricted by the nanofiller loading. Photoluminescence and absorption spectra indicate that localized states are not induced by the nanofiller loading. Moreover, ultraviolet absorption and THz spectra are obtained for various electric insulating materials and assignments of some of the peaks observed are carried out using numerical calculations based on the density functional theory.