Synthesis and characterization of high dielectric constant polyaniline/polyurethane blends

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题名:	Synthesis and characterization of high dielectric constant polyaniline/polyurethane blends
作者:	Chwang CP Liu CD Huang SW Chao DY Lee SN
贡献者:	化學系
关键词:	high dielectric constant polyaniline polyurethane blend in situ polymerization morphology
日期:	2004
上传时间:	2009-11-27 11:13:43 (UTC+8)
摘要:	A novel polyaniline-dodecyl benzenesulfonic acid/polyurethane (PANI-DBSA/PU) blend with very high dielectric constant (epsilon(r) similar to 1120) has been developed in this work. This blend was prepared by in situ polymerization of aniline in a well-dispersed aqueous solution of PU (ISP-blend). The dielectric constant of this blend increases with the content of PANT, and rises drastically as PANT-DBSA content exceeds 15 wt.%. Similar PANI-DBSA/PU blends prepared by simple solution mixing method (SM-blend) show no resemblance in the dielectric, conductive and thermal behaviors as compared to that of the ISP-blends. Significant different morphologies are observed by SEM for these two types of blends, i.e. a homogeneous structure was found in the ISP-blends, while an inhomogeneous phase segregated with PANT particulates was shown by the SM-blends. The ultra high dielectric constant exhibited by the ISP-blend is attributed mainly to the electrode polarization effect generated by the PANT component within the blend. (C) 2003 Elsevier B.V. All rights reserved.
關聯:	SYNTHETIC METALS Volume: 142 Issue: 1-3 Pages: 275-281
显示于类别:	[化學系所] 期刊論文

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