Waterborne polyurethane‐acrylate‐polyaniline: Interfacial hydrogen bonding for enhancing the antistatic, damping, and mechanical properties

Abstract

AbstractDamping coatings can convert kinetic energy into other forms of energy for consumption and have been widely used for vibration and noise reduction in rail trains, aerospace, automobile industry, and other fields. However, many aspects of damping coating such as, damping, water resistance, heat resistance, mechanical properties and antistatic properties require further improvement. In this study, a low‐cost conductive polyaniline (PANI) with a simple preparation method was dispersed in N‐methyl pyrrolidone and added to waterborne polyurethane‐acrylate (WPUA) hybrid latexes. The interfacial hydrogen bonding increases the interaction force between molecular chains, effectively improve the water resistance, heat resistance, damping, and mechanical properties of WPUA, and endowed WPUA with antistatic properties. Among them, PANI was used as an antistatic medium to be synthesized by chemical oxidation and doped with dodecylbenzene sulfonic acid, and the matrix polymer WPUA was the used of hydroxyethyl methacrylate (HEMA) to combine polyacrylate with waterborne polyurethane (WPU) by chemical bonds. The waterborne polyurethane‐acrylate‐polyaniline (WPUA‐PANI) films were investigated using dynamic light scattering , contact angle measurements , dynamic mechanical analysis, Fourier‐transform infrared spectroscopy (FTIR), digital highresistance meter and other characterization methods. It was concluded that the base latex has good stability, and when the PANI dispersion content was 35%, the comprehensive performance of the WPUA‐PANI films were the best, in which the maximum water contact angle was 106.8°, the tensile strength was increased from 0.7 MPa to 2.3 MPa, the effective damping temperature range (Tanδ ≥ 0.3) was increased from 50 °C to 87 °C, and the resistivity was reduced from 6.41E + 7 Ω·cm to 1.38E + 4 Ω·cm, which had better antistatic properties. This study will promote the development and application of damping coatings.