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Environmentally friendly waterborne polyurethane (WPU) films were functionalized by incorporating nanotitanium dioxide (TiO 2 ). In order to improve the dispersion of TiO 2 in the WPU matrix and intensify the interfacial interaction between TiO 2 and WPU, green and biocompatible dopamine (DA) modified TiO 2 , that is, DA-TiO 2 , was produced. Fourier transforms infrared (FTIR) and UV-vis spectra confirmed that DA had been successfully grafted on the surface of TiO 2 . The structure, mechanical and thermal properties of WPU/DA modified TiO 2 (WPU/DA-TiO 2 ) 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-TiO 2 containing 1 wt% DA-TiO 2 increased by 56.8% and 37.0%, respectively, compared to pure WPU. These results can be ascribed to the good dispersion of DA-TiO 2 and the strong interfacial interaction between DA-TiO 2 and WPU matrix. In addition, the thermal properties and water resistance of WPU/DA-TiO 2 films also had been improved. POLYM. COMPOS., 00:000-000,

Polymer‐dispersed liquid crystals (PDLCs) with a well‐defined polymer matrix were successfully fabricated by the thiol‐ene click reaction based on poly(ethylene glycol) diacrylate (PEGDA) and trimethylolpropanetris‐(3‐mercaptopropionate) (TMTP). UV−visible spectrophotometry, Fourier transform IR spectroscopy, SEM and polarized optical microscopy were employed to explore the PDLC films obtained. Electro‐optical properties were studied with a UV−visible spectrophotometer. It was found that the PDLC films with optimal thiol content fabricated by the thiol‐ene click reaction showed high transmittance, low driving voltage and a low memory effect. It was concluded that the driving voltage change of PDLCs with different thiol concentrations was caused by the polymerization rate and the structure of the polymer matrix. © 2017 Society of Chemical Industry

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