Polyacrylic acid modified graphene oxide in WPU based coatings
In a new paper, the polyacrylic acid modified graphene oxide (PAA-nGO) with high dispersion stability in a wide range of pH (4–11) was prepared via two step amidation reaction. Significantly, PAA-nGO can be uniformly dispersed in WPU as bifunctional additive to prepare WPU/PAA-nGO coatings with enhanced mechanical property, chemical resistance and abrasion durability. The as-prepared WPU/PAA-nGO coating exhibited improved tensile strength (18.12 MPa) and tear strength (38.07 kN/m), which were 56.1% and 51.5% higher than those of pure WPU coating, respectively.
Interestingly, WPU/PAA-nGO coating showed improved chemical resistance. Notably, abrasion durability of WPU/PAA-nGO coating was significantly enhanced, and the mass loss rate was decreased by 77.1%. Overall, the new work provided a potential strategy for improving the mechanical property, chemical resistance and abrasion durability of WPU based coatings by introducing PAA-nGO with well dispersion and high stable in a wide pH range.
The study has been published in Progress in Organic Coatings, Volume 170, September 2022.