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Mechanochemically Carboxylated Multilayer Graphene Nanoplatelets as Functionalized Carbon Nanofillers for Electrically Conductive Epoxy Spray Coatings
Author(s) -
Gatti Felix Joachim,
Burk Laura,
Gliem Matthias,
Mülhaupt Rolf
Publication year - 2019
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201800582
Subject(s) - materials science , composite material , epoxy , toughness , graphene , graphite , coating , gloss (optics) , ball mill , nanotechnology
Dry ball milling of graphite under CO 2 pressure in a planetary ball mill affords carboxylated multilayer graphene nanoplatelets as carbon nanofillers (MFG‐CO 2 ) for carbon/epoxy spray coatings combining electrical conductivity up to 0.09 S cm −1 with excellent adhesion and improved toughness. As confirmed by µCT‐imaging, the two‐stage homogenization by means of a speed mixer with subsequent shearing in a three‐roll mill uniformly disperses up to 60 wt% MFG‐CO 2 in aqueous emulsions of epoxy resins and hardener without impairing spray coating. The MFG‐CO 2 content governs surface roughness, as determined by 3D laser microscopy, gloss, electrical conductivity, and toughness without adversely affecting excellent adhesion. Mechanochemical tailoring MFG nanofillers holds great promise for the development of advanced epoxy spray coatings exhibiting an improved balance of thermooxidative, chemical and environmental stability, electrical and thermal conductivity, toughness, corrosion, and barrier resistance.