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Electrically Conductive Graphene/Poly(methyl methacrylate) Composites with Ultra‐Low Percolation Threshold by Electrostatic Self‐Assembly in Aqueous Medium
Author(s) -
Vo Ngoc Hoang,
Dao Trung Dung,
Jeong Han Mo
Publication year - 2015
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201400560
Subject(s) - percolation threshold , materials science , graphene , composite material , composite number , methyl methacrylate , percolation (cognitive psychology) , electrical conductor , aqueous solution , polymer chemistry , dispersion (optics) , cationic polymerization , chemical engineering , electrical resistivity and conductivity , nanotechnology , copolymer , chemistry , polymer , organic chemistry , biology , physics , engineering , optics , neuroscience , electrical engineering
Thermally reduced graphene modified with cationic ammonium ions (AAG)—affording a stable dispersion in water—self‐assembles well by electrostatic interaction on the surface of anionic poly(methyl methacrylate) (PMMA) particles of various sizes, by simple mixing in water. An interconnected 3D electrically conductive network of AAG is effectively generated in the composite when the self‐assembled composite is compression molded. The AAG network becomes wide‐meshed and electrical conduction is improved when the PMMA particle size increases, exhibiting a percolation threshold of electrical conductivity as low as 0.06 vol%. In contrast, the protection of PMMA from oxidation by air is more effective when the network is fine‐meshed.