Herein, a self-healing hybrid polyurethane acrylate was prepared by solution polymerization of acrylic monomers (2-hydroxypropylmethacrylate/butyl acrylate mixture) in the presence of performed polyurethane chains containing aliphatic disulfide bonds with terminal...
Herein, we report an approach to prepare Cu/Cu2−xS core/shell nanorods by in situ sulfidation of copper nanorods. Firstly, copper nanorods with tunable longitudinal surface plasmon resonances were synthesized by a seed-mediated method using Au nanoparticles as seeds. A convenient in situ sulfidation method was then applied to convert the outermost layer of Cu nanorods into Cu2−xS, to increase their stability and surface activity in photocatalytic applications. The thickness of Cu2−xS layer can be adjusted by controlling the amount of S source. The Cu/Cu2−xS core/shell nanorods exhibits two characteristic surface plasmon resonances located in visible and near-infrared regions, respectively. The photocatalytic performances of Cu nanorods and their derivatives were evaluated by measuring the degradation rate of methyl orange dyes. Compared with Cu nanorods, the Cu/Cu2−xS core/shell nanorods demonstrate more than a 13.6-fold enhancement in the degradation rate at 40 min. This work suggests a new direction for constructing derivative nanostructures of copper nanorods and exploring their applications.
Non-isocyanate polyurethane (NIPU) is one of the hot spots in the scientific research of polyurethane. In this work, mechanically regulable NIPU were prepared by ring-opening polymerization of cyclic carbonates via diamines. Cyclocarbonates with different functionalities were firstly synthesized by thiol-ene click reaction, which was characterized through nuclear magnetic resonance spectroscopy (NMR) and Fourier transform infrared spectroscopy (FITR). Subsequently, the controllable performance of NIPU films were obtained by using diamines with different structures. The mechanical and thermal properties of prepared NIPU films were studied by swelling experiment, differential scanning calorimetry (DSC), tensile test and thermogravimetric analysis (TGA). Experimental results suggested that the control of functionality and reactivity endowed the material with an adjustable crosslinking density. The Young's modulus of the material could be regulated from 51.31 MPa to 765.07 MPa. Furthermore, the studied films also showed good thermal stability.
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