High-dielectric-constant all-polymer percolative composites

Huang, Cheng; Zhang, Q. M.; Su, Ji
May 2003
Applied Physics Letters;5/19/2003, Vol. 82 Issue 20, p3502
Academic Journal
We report here an all-polymer high-dielectric (dielectric constant K > 1000 at 1 kHz) percolative composite material, fabricated by a combination of conductive polyaniline particles (K>10[sup 5]) within a poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) terpolymer matrix (K > 50). These high-K polymer hybrid materials also exhibit high electromechanical responses. For example, 1.5% strain, which is proportional to the square of the field applied, can be induced by a field of 9.5 MV/m, an eightfold reduction in field applied compared with that in a fluoroterpolymer matrix.


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