磁场协助聚苯胺纳米复合薄膜材料的可控制备及电磁性能研究

In order to improve their properties and functions and extend their applications in various technology fields, it is desired to decorate nanofillers such as carbon nanotubes (CNTs) and silver nanowires (Ag NWs) by foreign magnetic materials. And the decorated nanofillers can be filled into polymer matrices to make polymer nanocomposites with excellent properties. In this proposal, CNTs and Ag NWs will be decorated with magnetic materials such as magnetite nanoparticles etc. by a facile co-precipitation method. The as-prepared magnetic-coated nanofillers are then incorporated into conducting polyaniline (PANI) to make nanocomposite films. The controllable fabrication of electromagnetic PANI nanocomposites can be realized via controlling the amount of magnetic materials and adjusting the magnitude of applied magnetic field. The microstructure, nano-structure, electrical and magnetic properties of PANI nanocomposite films will be systematically investigated by taking into account the effects of various factors including applied magnetic field magnitude, nanofiller content/orientation/dispersity and composite micro-structure. The relationships between the electrical and magnetic properties and the above factors will be established. The outcome of this proposal can be served as a solid basis for application of PANI nanocomposites in the field of electromagnetic shielding technology etc. Thus, the proposed research work is of significant importance from both fundamental and practical aspects.

为了改善性能、增加功能并更好地将其应用于各技术领域，可对纳米填料如纳米碳管和纳米银线进行表面磁性包覆，并将其与高分子复合获得具有优异性能的高分子基纳米复合材料。本项目拟采用简易共沉淀法对纳米碳管和纳米银线进行表面磁性(如：Fe3O4纳米颗粒)包覆，然后与导电高分子聚苯胺(PANI)进行复合制备纳米复合薄膜材料。通过控制包覆磁性材料含量和外加磁场，实现具有电磁功能的聚苯胺纳米复合薄膜材料的可控制备。通过研究确定影响PANI纳米复合薄膜材料的结构和物理性能的主要因素(如：外加磁场大小、纳米填料含量、取向、分散及复合材料微观结构)，系统研究电磁功能纳米复合薄膜材料的微观结构、纳米结构、电性能和磁性能。建立电学和磁学等性能与以上各因素之间的关系，研究成果可为实现PANI纳米复合薄膜材料在电子屏蔽等技术领域的应用做好技术储备。因而，本项目具有重要的理论和实际意义。

为了改善性能、增加功能并更好的将其应用于各个技术领域，对纳米填料（纳米碳管和纳米银线）进行了表面磁性包覆，并将其与高分子复合获得了具有电、磁各向异性优异性能的高分子基纳米复合材料。本项目采用的是一种简易共沉淀法用四氧化三铁纳米粒子包覆纳米碳管和纳米银线，然后与导电高分子聚苯胺（PANI）进行复合制备出纳米复合薄膜材料。通过控制包覆的四氧化三铁的含量和外加磁场强度大小，实现了具有电磁功能的聚苯胺纳米复合薄膜材料的可控制备。通过研究确定了影响PANI纳米复合薄膜材料的结构和物理性能的主要因素（包括：外加磁场大小、纳米填料含量等），系统地研究了电磁功能纳米复合薄膜材料的微观结构、纳米结构、电性能和磁性能。建立了电学和磁学等物理性能与以上各因素之间的关系，研究成果可为实现PANI纳米复合薄膜材料在电子屏蔽等技术领域的应用做好技术准备。