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22. Oct 2018 | Application Areas

APTES-grafted reduced sulfonated graphene/waterborne polyurethane coatings

Researchers have recently achieved improved corrosion resistance based on APTES-grafted, reduced sulfonated water-based graphene/polyurethane coatings.

With increasing RSG content, the hydrophobicity of the RSG/WPU films increased due to the strong covalent interaction between RSG and WPU. Source: sshoults – stock.adobe.com.

In a recently published work, reduced sulfonated graphene (RSG) containing free amine groups was prepared and modified by 3-aminopropyltriethoxysilane (APTES) and reduction by diethanolamine (DEA). In addition, waterborne polyurethane (WPU) composite coatings were prepared by adding RSG as an anticorrosive filler to WPU.

Characterisation by polarisation curves and salt spray tests

From the results of Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy (SEM), it can be found that sulfonated graphene was modified with APTES and successfully reduced by DEA. The SEM images illustrated that RSG was uniformly doped in the WPU. With increasing RSG content, the hydrophobicity of the RSG/WPU films increased due to the strong covalent interaction between RSG and WPU. Finally, the corrosion resistance of the coating was characterised by polarisation curves and salt spray tests.

The study was published in: Journal of Coatings Technology and Research  September 2018, Volume 15, Issue 5, pp 1107–1115.

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