Abstract Inorganic filler and polymer matrix based PP + SiO2 nanocomposites have been prepared by the hot pressing method. The scanning electron microscopy (SEM) and X-ray diffractometer(XRD) were used for structure investigation. It was found that the average size of the nanoparticles is around 50 nm. Photoluminescence properties of PP + SiO2 nanocomposite and the effect of concentration of the SiO2 nanofiller on dielectric and electrical dispersion behavior of the nanocomposite have been investigated. Besides, it was shown that the dielectric permittivity of PP + SiO2 nanocomposite samples was gradually increased with raising filler content. Furthermore, it was observed a significant decreasing in the values of the ε′ and δ parameters of the nanocomposites in the 103-106Hs frequency range for all concentrations of filler. This decrease perhaps associated with the interphase polarization of the PP + SiO2 nanocomposites. It was also shown that PP + SiO2 nanocomposite demonstrates wide-band photoluminescence in visible region (400-700nm) when the excitation wavelength is 370 nm. This is due to the defects of SiO2 nanoparticles embedded in the polymer matrix, and more precisely, with presence of oxygen-deficiency centers.

中文翻译：

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具有增强光学和介电性能的无定形二氧化硅 Np 嵌入聚合物纳米复合材料

摘要 采用热压法制备了无机填料和聚合物基PP+SiO2纳米复合材料。使用扫描电子显微镜（SEM）和X射线衍射仪（XRD）进行结构研究。发现纳米颗粒的平均尺寸约为50nm。研究了 PP + SiO2 纳米复合材料的光致发光性能以及 SiO2 纳米填料浓度对纳米复合材料介电和电色散行为的影响。此外，PP+SiO2纳米复合材料样品的介电常数随着填料含量的增加而逐渐增加。此外，对于所有浓度的填料，在 103-106Hs 频率范围内，观察到纳米复合材料的 ε' 和 δ 参数值显着降低。这种降低可能与 PP + SiO2 纳米复合材料的相间极化有关。研究还表明，当激发波长为 370 nm 时，PP + SiO2 纳米复合材料在可见光区（400-700 nm）显示出宽带光致发​​光。这是由于嵌入聚合物基质中的 SiO2 纳米粒子的缺陷，更准确地说，是由于存在缺氧中心。