Study on dielectric properties of polyimide/barium titanate composites

PMSE 109

Wei-Dong Liu, liuwd@zjnu.cn1, Bao-Ku Zhu, zhubk@zju.edu.cn2, Shu-Hui Xie3, and Jian Zhang3. (1) College of Chemistry and Life Science, Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Zhejiang Normal University, Jinhua, 321004, China, (2) Department of Polymer Science and Engineering, Zhejiang University, Zheda Road 38#, Hangzhou, 310027, China, (3) Institute of Polymer Science, Zhejiang University, Hangzhou, 310027, China
High dielectric constant composites have attracted great attention for their interesting properties, such as better processing property and flexibility. In this work, a series of polyimide/barium titanate composite films were successfully prepared through blending barium titanate particles modified with silane modified coupling agent, and imidization. The influence of processing factors, such as particle size, distribution modal, and frequency of field on dielectric properties were studied. Results revealed that the dielectric constant of the composite film increased for the systems using larger-sized particles and two-modal distribution. The dielectric constant of composite containing BaTiO3 particle (in 50% by volume fraction) could reach 35. Based on the production of high dielectric constant PI/BaTiO3 composites, the experimental dielectric constants are compared with that predicted by series, parallel mixing models, Maxwell's equation, Lichtenecker's mixing model, Bruggeman's equation and Rao's EMT model. The results revealed that following EMT model, the dielectric constant of polyimide/BaTiO3 nanocomposite could be predicted properly.
 

Synthesis and Self-Assembly Approaches to Polymer-Inorganic Hybrid Nanoparticles
1:30 PM-4:40 PM, Monday, April 7, 2008 Hilton New Orleans Riverside -- Grand Salon 24, Oral

Division of Polymeric Materials: Science & Engineering

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008