KH550硅烷偶联剂对复合材料结构和介电性能影响

Study on the dielectric properties of BaTiO_3/PVDF composite modified by coupling agent

采用KH550硅烷偶联剂对BaTiO3粉体进行了表面处理,用溶液混合法及热压工艺制备了Ba-TiO3/PVDF复合材料。通过扫描电子显微镜对复合材料形貌的分析发现偶联剂的用量对复合材料形态影响较大;用傅立叶变换红外光谱仪和X射线衍射分析了偶联剂用量对BaTiO3/PVDF复合材料微观结构影响;通过阻抗分析仪研究了复合材料的介电性能,发现偶联剂用量对复合材料介电性能影响很大,当偶联剂用量在1%(质量分数)时,BaTiO3体积分数为40%的复合材料介电常数高达51。

Barium titanate （BaTiO3） / polyvinylidene fluoride （PVDF） composites were prepared by solution and hot-pressed process after BaTiO3 powder was modified by KH550 siloxane coupling agent. The Scan Electron microscopy （SEM） images show that mass fraction of coupling agent has a great impact on the morphologies of the composites. The impact of mass fraction of coupling agent on microstructure was studied by FTIR, XRD. The dielectric properties were measured by impedance analyzer. It was found that mass fraction of coupling agent has an important impact on dielectric property, especially at lwt% where the dielectric permittivity of the composite reached the maximum, 51 at 40vol% BaTiO3.