文献类型：期刊文献

英文题名：Enhanced dielectric performance of PDMS- based three- phase percolative nanocomposite films incorporating a high dielectric constant ceramic and conductive multi- walled carbon nanotubes

作者：Liu, Guifang[1];Chen, Yi[2];Gong, Minjie[1];Liu, Xiaoyun[1];Cui, Zhong-Kai[3];Pei, Qibing[4];Gu, Jinlou[1];Huang, Chen[1];Zhuang, Qixin[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Adv Polymer Mat Shanghai, Shanghai 200237, Peoples R China;[2]Shanghai Spaceflight Precis Machinery Inst, Shanghai 201600, Peoples R China;[3]Southern Med Univ, Sch Basic Med Sci, Guangzhou 510515, Guangdong, Peoples R China;[4]Univ Calif Los Angeles, Dept Mat Sci & Engn, Soft Mat Res Lab, Los Angeles, CA 90095 USA

年份：2018

卷号：6

期号：40

起止页码：10829

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20184305981485);WOS:【SCI-EXPANDED(收录号:WOS:000448342700018)】；

基金：This work was financially supported by the National Natural Science Foundation of China (51573045, 51773060), and the International Collaboration Research Program of Science and Technology Commission of Shanghai (16520722000).

语种：英文

外文关键词：Calcium compounds - Film preparation - Multiwalled carbon nanotubes (MWCN) - Image enhancement - Microchannels - Permittivity - Conductive films - Carbon films - Chains - Copper compounds - Dielectric losses - Dielectric properties of solids - Nanocomposite films - Nanoparticles - Silicones - Polymer matrix composites - Solvents - Tensile strength

摘要：Three-phase composite films CCTO@MWCNT/PDMS with enhanced dielectric constant (epsilon) and low dielectric loss are prepared by embedding covalently bonded calcium copper titanate (CaCu3Ti4O12, CCTO) with multi-walled carbon nanotubes (MWCNTs) composite nanoparticles (CCTO@MWCNT), forming a chain-ball structure, into the polydimethylsiloxane (PDMS) matrix. To impede the natural stacking of MWCNTs, CCTO particles are functionalized first with a silane coupling agent containing amino groups, and then react with carboxyl-functionalized MWCNTs (MWCNT-COOH) to achieve the strong linkage between CCTO and MWCNTs, confirmed by the FTIR spectrum and SEM images, etc. The chain-ball CCTO@MWCNT nanoparticles have effectively improved the dielectric permittivity of PDMS. The dielectric constant of the CCTO@MWCNT/PDMS composite film, agreeing well with the percolation theory, is up to 2133 at 1 kHz, higher than that of pure PDMS by a factor of 700, when the volume fraction of MWCNTs approaches the percolative threshold. Meanwhile, the dielectric loss is only 0.19. For comparison, CCTO/PDMS and MWCNT/PDMS films are prepared and investigated as well. The Yamada model can effectively predict the dielectric constant of CCTO/PDMS composite films. The dielectric constants of CCTO/PDMS and MWCNT/PDMS films are 1/180 and 1/6, respectively, in comparison with that of CCTO@MWCNT/PDMS. The tensile strength of CCTO@MWCNT/PDMS approaches 1.12 MPa, 3 times higher than that of pure PDMS.