Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7892216 | Composites Part A: Applied Science and Manufacturing | 2014 | 10 Pages |
Abstract
New high-k composites based on unique multi-branched polyaniline (MSiPA)/multi-walled carbon nanotube (MWCNT) hybrids and epoxy (EP) resin were prepared. MSiPA/MWCNT/EP composite has much higher dielectric constant and lower dielectric loss than MWCNT/EP composite with the same loading of MWCNTs. Dielectric constant and loss at 100Â Hz of MSiPA3/MWCNT0.4/EP composite are 2.4 and 3.3Â ÃÂ 10â3 times the value of MWCNT0.4/EP composite, respectively; meanwhile the percolation threshold of MSiPA/MWCNT0.4/EP composites is as low as 0.51Â wt%, remarkably lower than that of available composites with coated MWCNTs. These attractive results are attributed to unique structures of MSiPA/MWCNT hybrids. The multi-branched structure, large polyaniline concentration and flexible Si-O chains make MSiPA have big ability to be coated on surfaces of MWCNTs through Ï-Ï interaction. Different from MWCNTs, MSiPA/MWCNT hybrids have good dispersion in EP matrix, forming more micro-capacitors and avoiding the loss of conductive currents. Equivalent circuits were built to further discuss the origin behind.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Zhixiang Qiang, Guozheng Liang, Aijuan Gu, Li Yuan,