X.Q. Li

UV-curable polyurethane acrylate–Ag/TiO 2 nanocomposites with superior UV light antibacterial activity

ABSTRACT Polyurethane acrylate (PUA)–Ag/TiO2 nanocomposites were synthesized through in situ polymerization. The well-dispersed Ag/TiO2 nanorods serve as photoinitiator. Meanwhile, the PUA–Ag/TiO2 nanocomposite films exhibit superior activity toward the photocatalytic degradation of Escherichia coli under UV light. The excellent UV curing and antibacterial activities can be ascribed to the synergistic effect of Ag and TiO2, which promotes the effective electron/hole separation and thus generates various reactive species. Thin films with these nanoparticles are more hydrophilic after UV illumination. And the antibacterial mechanism of the UV-curable PUA–Ag/TiO2 nanocomposites was proposed. GRAPHICAL ABSTRACT

Waterborne polyurethane-silanized CoFe2O4-acrylate magnetic pressure-sensitive adhesive

ABSTRACT A novel waterborne polyurethane-silanized CoFe2O-acrylate magnetic pressure-sensitive adhesive was prepared. With the increase of PU content, gel content, swelling capability, and SAFT increased, and fracture energy increased first, then decreased. The T-peeling strength increased from 8.93 to 19.07 N · m−1, tack force increased from No.3 to No.10, while shear resistance increased from 35 to 72 h, and then they decreased. Two empirical models: WA = 90.46 + 125.04[PU]-319.96[PU]2 and T = 9.09 + 96.07[PU]-235.11[PU]2, were obtained. With the increase of CoFe2O4 content, the saturation magnetization increased from 5.5 to 14.2 emu · g−1, and remanence increased from 1.7 to 3.7 emu · g−1, while coercivity decreased from 875 to 763 Oe. GRAPHICAL ABSTRACT