BaTiO3/PS复合材料亚表面微观结构的分辨分析

Resolving the Sub-Surface Microstructure in BaTiO3/PS Composite

增强相的随机分布使得聚合物基纳米复合材料具有复杂微观结构,极大地影响其物理力学性能,然而复合材料内部微观结构的纳米尺寸无损检测分析仍然存在极大挑战.该文采用有限元方法模拟了原子力显微技术(AFM)非接触模式下,带电探针与BaTiO3/PS复合材料间的力电耦合交互作用,分析复合材料内的电弹性场分布,探究增强相掩埋深度与极化取向对AFM响应信号和静电力的影响.该研究为复合材料内部微观结构的AFM无损检测实验分析提供了重要指导.

The microstructures of polymer nanocomposites have strong effect on their physical and mechanical properties,which is induced by the random distribution of the reinforced phase.However,it remains a great challenge on non-destructive characterize the subsurface of the microstructures at the nanoscale in polymer nanocomposites.Here the electromechanical interactions between the charged probe and polymer nanocomposite are modelled under non-contact mode atomic force microscopy (AFM) experiment,through the finite element method.The electroelastic fields are derived in BaTiO3 /PS composite,and further we analyze the influences of the buried depth and polarization orientation of BaTiO3 particle,on the displacements,potentials,and the electrostatic forces.These researches provide the significant guidelines for non-destructive resolving the subsurface nanostructures under AFM experiment in polymer nanocomposites.