Abstract
Environmentally friendly waterborne polyurethane (WPU) films were functionalized by incorporating nano‐titanium dioxide (TiO2). In order to improve the dispersion of TiO2 in the WPU matrix and intensify the interfacial interaction between TiO2 and WPU, green and biocompatible dopamine (DA) modified TiO2, that is, DA‐TiO2, was produced. Fourier transforms infrared (FTIR) and UV‐vis spectra confirmed that DA had been successfully grafted on the surface of TiO2. The structure, mechanical and thermal properties of WPU/DA modified TiO2 (WPU/DA‐TiO2) films had been carefully investigated using FTIR, transmission electron microscopy (TEM), X‐ray diffraction (XRD), tensile experiments and thermogravimetric analysis (TGA). The tensile strength and elongation at break of WPU/DA‐TiO2 containing 1 wt% DA‐TiO2 increased by 56.8% and 37.0%, respectively, compared to pure WPU. These results can be ascribed to the good dispersion of DA‐TiO2 and the strong interfacial interaction between DA‐TiO2 and WPU matrix. In addition, the thermal properties and water resistance of WPU/DA‐TiO2 films also had been improved. POLYM. COMPOS., 40:328–336, 2019. © 2017 Society of Plastics Engineers
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