一核双壳结构的低损耗高介电聚合物纳米复合材料的制备与性能研究

项目名称： 一核双壳结构的低损耗高介电聚合物纳米复合材料的制备与性能研究

项目编号： No.51277117

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 电工技术

项目作者： 江平开

作者单位： 上海交通大学

项目金额： 80万元

中文摘要： 本研究采用原位聚合的方法制备具有一核多壳结构的聚合物高介电纳米复合材料，通过改变壳层的结构来调节材料的介质损耗，抑制泄漏电流。选用聚苯乙烯和聚甲基丙烯酸甲酯作为目标基体材料，纳米钛酸钡颗粒做为高介电颗粒。这种方法制备的材料可通过旋涂的方法制备出结构均匀的纳米级薄膜，也可通过热压的方法得到块体材料。本研究的核心思想是在高介电纳米结构的最外层调控势垒，构筑具有低泄漏电流的壳层，同时调控界面结构,以期达到降低吸收电流损耗这一目的。技术上，主要通过原子转移自由基聚合物等原位聚合方法。物理上，本研究主要研究两个关键问题，一是复合介质材料的介质损耗以及泄漏电流与壳层结构的关系，另一个是研究原位制备的纳米复合材料的慢极化行为，特别是界面的分子松弛行为与常规方法制备的纳米复合材料的区别。

中文关键词： 高介电常数；低损耗；纳米；壳结构；聚合物复合材料

英文摘要： Single-core/multi-shell structured polymer composites with high dielectric constant and low loss will be prepared by in situ methods such as atom transfer radical polymerization. It is expected that the dielectric loss of the composites can be tuned by changing the shell structure of the composite particles and thus the leakage currents of the composites can be suppressed. Polystyrene and poly(methyl methacrylate) are chosed as the final matrix for the nano-structured composites and BaTiO3 will be used as the high-dielectric-constant fillers. The merit of this method is that one can fabricate samples with homogeneous nano-structured composites either by solution spinning or by thermal compression. The core idea of this project is to introduce polymer layer with low leakage currents and high potential barrier as the outside shell of the composite particle, which is expected to reduce the dielectric loss of the final composites. In physics, this project will focus on two key issues. One is the relationship between shell structure with dielectric loss tangent and the leakage currents; another is how the preparation methods, i.e., in situ and physical compounding, affect the slow polarization and the relaxation behaviors of the polymer molecules, in particular those near the interphases.

英文关键词： high dielectric constant；low loss；nano；shell structure；polymer composites