Journal
COMPOSITES PART B-ENGINEERING
Volume 188, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2020.107889
Keywords
Graphene oxide; Polymer-matrix composites (PMCs); Corrosion; Computational modelling
Funding
- National Natural Science Foundation of China [U1560108, U1760119]
- Science and Technology Commission of Shanghai Municipality [17511101603, 17XD1403000, 18ZR1426300]
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A crosslinkable graphene oxide (GO) was synthesized and employed as reinforcement in waterborne polyurethane (WPU) composite coatings for improving corrosion protection properties. Polycarbodiimide (PCD), a crosslinking agent of WPU, was chosen to modify GO. Three different conformations of functionalized graphene will be generated: grape cluster conformation, network conformation and tail conformation, varying mainly with the PCD/GO ratio. Experiments and molecular dynamics simulation were carried out to study the correlations between the PCD/GO ratio, the conformations of functionalized graphene, as well as the dispersion state of graphene layers. The functionalized graphene with tail conformation was crosslinkable with WPU molecules along the interfaces. Electrochemical impedance spectroscopy showed that the WPU coatings with 0.2 wt% crosslinkable graphene remained at a maximum impedance modulus of 10(9) Omega cm(2) after 120 days immersion without any decrease. The superior anticorrosive properties benefited from the barrier properties of well-dispersed graphene layers, the crosslinking structure along the functionalized graphene/WPU interfaces, as well as the improved water resistance of the coatings.
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