Synthesis and mechanical properties of dopamine modified titanium dioxide/waterborne polyurethane composites

Abstract

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,

Significantly Enhanced Energy Density by Tailoring the Interface in Hierarchically Structured TiO2–BaTiO3–TiO2 Nanofillers in PVDF-Based Thin-Film Polymer Nanocomposites

“…The peak at around 3400 cm –1 is assigned to the stretching vibration of the −OH group of catechol and the bending vibrations of C–OH at 1397, 1155, and 1127 cm –1 . Also, the strong peak at 983 cm –1 corresponds to the C–C–H bending of dopa. ,,− The peaks at 1066 and 1122 cm –1 are attributed to the −OH groups, while the one at 1635 cm –1 is assigned to the bending mode of absorbed H–O–H molecules. , Thus, FTIR data confirms the successful attachment of dopa on TiO 2 , TiO 2 –BT, and TiO 2 –BT–TiO 2 NP surface.…”

“…In all of the spectra, the peak at 3440 cm –1 is associated with the vibration of surface hydroxyl groups or the adsorbed water, while the OH bending vibration peak at 1635 cm –1 corresponds to chemisorbed water. Other peaks at 1400 cm –1 as well as in the range of 394–984 cm –1 correspond to Ti–O stretching peaks. − A careful investigation of TiO 2 –BT (without acid wash) and TiO 2 –BT–TiO 2 (without acid wash) spectra reveals the presence of new peaks of BaCO 3 , which are absent in acid-washed samples, as shown in Figure S4b. The peaks at 857 and 693 cm –1 are attributed to the in-plane and out-of-plane bending of CO 3 2– .…”

Mussel‐inspired synthesis of silver nanoparticles as fillers for preparing waterborne polyurethane/Ag nanocomposites with excellent mechanical and antibacterial properties

“…To expand the application fields of WPU, the incorporation of metallic nanoparticles into WPU is an effective strategy for improving the mechanical properties and imparting it with some functionalities, such as electrical conductivity and thermal stability. [3][4][5][6] Among the metallic nanoparticles, silver nanoparticles (AgNPs) have been attracting much attention in the preparation and practical application of polymer-based nanocomposites due to their high thermal stability and broad spectrum of antimicrobial properties. [7][8][9][10] However, the aggregation of AgNPs resulting from the high surface energy and van der Waals force leads to the diminishment or loss of antibacterial activities.…”

“…However, compared with conventional solvent‐based polyurethane, the properties of WPU become inferior in mechanical properties, water resistance and wear resistance. To expand the application fields of WPU, the incorporation of metallic nanoparticles into WPU is an effective strategy for improving the mechanical properties and imparting it with some functionalities, such as electrical conductivity and thermal stability 3–6 . Among the metallic nanoparticles, silver nanoparticles (AgNPs) have been attracting much attention in the preparation and practical application of polymer‐based nanocomposites due to their high thermal stability and broad spectrum of antimicrobial properties 7–10 .…”

Performance improvement of alumina/silicone rubber composites by adding 3‐(trimethoxysilyl)propyl methacrylate grafted siloxane copolymer

“…Filler modification is considered as an effective method to enhance filler‐polymer interfacial interaction, thermal conductivity, and mechanical properties of thermally conductive composites. [ 4,11,12 ] For example, vinyltrimethoxysilane was used as a modifier to strengthen the interfacial interaction between SR and Al 2 O 3 . After modification, the thermal conductivity of Al 2 O 3 /SR composite increased from 0.231 to 0.265 W/(m∙K) at the Al 2 O 3 content of 15.2 vol%.…”