An approach to developing enhanced dielectric property nanocomposites based on acrylate elastomer. (15th May 2018)

• Record Type: Journal Article
• Authors: Wu, Sen-Qiang; Wang, Jing-Wen; Shao, Jing; Wei, Lei; Ge, Ren-Kui; Ren, Hua
• Is Part Of: Materials & design. Volume 146(2018)
• Page Start: 208
• Page End: 218
• Publication Date: 2018-05-15
• Subjects: Acrylate elastomer -- Ionic liquid -- Graphene -- π-π interaction -- Dielectric property; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2018.03.023
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: High dielectric constant (high- k ) polymeric materials suitable for electromechanical transducers should meet the requirements of low dielectric loss. This work introduced a ternary nanocomposite with acrylate elastomer (AE) as matrix, and chemically reduced graphene oxides (G) and poly(ionic liquid)s (PILs) as co-filler, of which AE was synthesized by solution polymerization. A unique hybrid (H) was fabricated by the ionic liquid monomers polymerized on the surface of graphene. Afterwards, hybrid of different filler contents was added into AE to prepare nanocomposites with solution casting method. The favorable π-π interaction between PILs and graphene made the co-filler a better dispersion in the matrix, which contributed to the enhanced dielectric property of the resultant nanocomposites. Dielectric constant of H/AE nanocomposite at 10 2 Hz was as high as 680 and the dielectric loss was only 0.34 when the filler content (1.69 vol%) approached to the percolation threshold ( f c ), which was attributed to PILs anchored on the surface of graphene acting as spacers and PILs cut the leakage currents induced by the direct connection of graphene. Moreover, the composite was still flexible that could engender larger strain in area. Graphical abstract: Unlabelled Image Highlights: A novel graphene hybrid functionalized with poly (ionic liquid)s is prepared which disperses uniformly in the acrylate elastomer. The nanocomposite modified with unique graphene hybrid gets much better dielectric property and applicable elastic modulus. The favorable π-π interaction obstructs the direct contact of graphene sheets to cut the leakage currents. MWS polarization and better dispersion dominate the mechanisms of the enhanced dielectric property.