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Encapsulated graphenes through ultrasonically initiated in situ polymerization: A route to high dielectric permittivity, low loss materials with low percolation threshold
Author(s) -
Fan Ping,
Wang Lei,
Jia Shunxin,
Chen Feng,
Yang Jintao,
Zhong Mingqiang
Publication year - 2017
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.44628
Subject(s) - materials science , percolation threshold , dielectric , dielectric loss , polystyrene , nanocomposite , composite material , permittivity , percolation (cognitive psychology) , graphene , in situ polymerization , dissipation factor , scanning electron microscope , polymerization , transmission electron microscopy , polymer , nanotechnology , optoelectronics , neuroscience , electrical engineering , electrical resistivity and conductivity , biology , engineering
To improve dielectric performance of polystyrene (PS) without sacrificing its flexibility and processability, PS encapsulated graphene sheets (PSG) were synthesized by ultrasonically initiated in situ polymerization and was incorporated into PS matrix as fillers. The structure and properties of the obtained PSG were investigated by Fourier transform infrared, transmission electron microscopy, scanning electron microscope, and atom force microscopies. The results showed that the in situ formed PS layers attached on the surface of graphene and there were strong interfacial interactions between them. In virtue of this core‐shell architecture and intrinsic properties of PSG, PS/PSG nanocomposites exhibited improved dielectric performance and a typical percolation transition with very low percolation threshold of 0.2 wt %. Compared with pure PS, significantly increased dielectric permittivity and a low loss tangent were observed for the composites. These composites might be potential flexible dielectric materials for use in high‐frequency capacitors with low loss. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44628.