借助等离子体引发丙烯酸-3-(全氟-3-甲基丁基)-2-羟丙酯在碳纳米管表面的诱导接枝聚合,得到新型氟化碳纳米管(f-CNTs),进而制备出f-CNT/热塑性聚氨酯(f-CNT/TPU)复合弹性体。结果表明,氟化虽不改变CNTs的表面结构,但却在其组成中引入了含量10.40%的氟元素。经含氟高聚物接枝碳纳米管的平均直径约为30 nm,均匀分散于TPU基体中。随着f-CNTs含量的增加,所得f-CNT/TPU复合弹性体的拉伸强度和断裂伸长率均呈现先增后减趋势。当f-CNTs加入量为0.3%时,该复合弹性体的拉伸强度和断裂伸长率分别高达36.5 M Pa和630%,较纯TPU弹性体分别提高40.4%和26.5%,并初步探讨了可能的增强增韧机理。而随着f-CNTs含量的增加,f-CNT/TPU复合弹性体的表面自由能由27.3 m N/m降低至9.9 m N/m,表现出优异的表面性能。
Fishbone-like PbMoO4 nanostructures are successfully obtained via the surfactant-assisted hydrothermal method at 160 ℃. Polyethylene glycol （PEG2000） is used as the template agent. The nanostructures are characterized via X-ray diffraction, field-emission scanning electron microscopy, Fourier transform infrared spectroscopy, ultraviolet-visible light （UV-Vis） spectroscopy, and photoluminescence （PL） measurements. The PbMoO4 morphology is highly associated with the molecular nature of PEG2000. PbMoO4 nanoparticles obtained from PEG2000 have a fishbone-shaped, scheelite-type tetragonal structure, in which numerous secondary branches vertically grow on both sides of the main stem. The structures exhibit broad PL emission bands with the maximum at 306 and 390 nm when excited at 250 nm. In addition, the UV-Vis absorption edge of the structures is in the 280 to 310 nm region, and the band gap is 4.07 eV. A plausible formation mechanism for the fishbone-like PbMoO4 nanostructures is also discussed.
