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Developing the dielectric mechanisms of polyetherimide/multiwalled carbon nanotube/(Ba0.8Sr0.2)(Ti0.9Zr0.1)O3 composites

Chean-Cheng Su1, Chia-Ching Wu2 and Cheng-Fu Yang1*

Author Affiliations

1 Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung, 81148, Republic of China

2 Department of Electronic Engineering, Kao Yuan University, Kaohsiung, 82151, Republic of China

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Nanoscale Research Letters 2012, 7:132  doi:10.1186/1556-276X-7-132

Published: 16 February 2012


Various amounts of multiwalled carbon nanotubes [MWNTs] were embedded into polyetherimide [PEI] to form PEI/MWNT composites, and their dielectric properties were measured at 1 MHz. The Lichtenecker mixing rule was used to find a reasonable dielectric constant for the MWNTs used in this study. The dielectric constants of the developed composites were significantly increased, and the loss tangents were significantly decreased as 2.0 wt.% (Ba0.8Sr0.2)(Ti0.9Zr0.1)O3 ceramic powder [BSTZ] was added to the PEI/MWNTs to form PEI/MWNT/BSTZ composites. The Lichtenecker and Yamada mixing rules were used to predict the dielectric constants of the PEI/MWNT and PEI/MWNT/BSTZ composites. Equivalent electrical conduction models of both composites were established using the two mixing rules. In addition, the theoretical bases of the two mixing rules were used to explain the measured results for the PEI/MWNT and PEI/BSTZ/MWNT composites.

composites; mixing rule; dielectric properties; electrical conduction mechanism