MICROWAVE DIELECTRIC PROPERTIES OF POLYIMIDE COMPOSITES BASED ON TiO2 NANOTUBES AND CARBON NANOTUBES

[摘要] A study of the microwave dielectric properties of a series of polyimide composites based on titanium dioxide nanotubes and carbon nanotubes is presented. The composites were prepared through casting technique onto glass plates of a poly (amic acid) solution incorporating different amounts of titanium dioxide nanotubes and/or carbon nanotubes, followed by thermal imidization under controlled temperature conditions. The dielectric properties were analysed through broadband dielectric spectroscopy within a frequency domain spanning from 1 MHz up to 3 GHz. The effects of filler content, temperature and frequency on samples’ microwave dielectric behaviour are discussed. The interfacial/Maxwell-Wagner and dipolar/orientational polarization were highlighted by the results. The samples demonstrated very stable dielectric properties while varying the temperature but are strongly depending on the filler content.

[学科分类] 生物技术

[关键词] Polyimide composites;Carbon nanotubes;Titanium dioxide nanotubes;Dielectric spectroscopy;Microwave dielectric properties