Surface modification of graphene for use as a structural Fortifier in water-borne epoxy coatings
Journal article, 2019
Graphene, the typical two-dimensional sp2 hybridized carbon allotrope, is widely used as a filler for improving the mechanical performance of polymers. However, its superhydrophobic surface makes it a big challenge to obtain stable graphene dispersions, especially in water-borne systems. On the contrary, graphene oxide (GO) shows excellent dispersibility in water, but strong oxidants and acids destroy its structure and degrade its mechanical properties. This largely limits its application in water-borne coatings. In this work, graphene from mechanical exfoliation was surface modified by p-aminophenol derived diazonium salt to achieve a homogenous dispersion. Moreover, the hydroxyl groups in p-aminophenol are able to combine with epoxy resins during the curing process to improve mechanical performance of the final coatings. The result shows that functionalized graphene shows a lower coefficient of friction and better abrasion resistance compared to GO.
Water-borne epoxy
Tribological properties
Functionalized graphene
Author
Ya Liu
Fudan University
Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems
Chao Xia
Applied Nano Surfaces Sweden AB
Abdelhafid Zehri
Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems
L. Ye
SHT Smart High-Tech
Nan Wang
SHT Smart High-Tech
Boris Zhmud
Applied Nano Surfaces Sweden AB
Hongbin Lu
Fudan University
Johan Liu
Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems
Shanghai University
Coatings
20796412 (eISSN)
Vol. 9 11 754Subject Categories
Polymer Chemistry
Polymer Technologies
DOI
10.3390/coatings9110754