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TiO2/WPU/PVA nanofibers were prepared by electrospinning with modified nano-TiO2, waterborne polyurethane (WPU) and polyvinyl alcohol (PVA) as main materials that were blended mechanically. The nanofibers morphologies and physical states were investigated using scanning electron microscopy (SEM), thermogravimetry analysis (TG), Fourier transform infrared (FTIR) spectroscopy and UV-visible (UV-Vis) spectroscopy. Scanning electron microscopy observations revealed that nano-TiO2 was modified by r-aminopropyltriethoxysilanehe in order to improve the dispersion of nano-TiO2 in WPU/PVA matrix and the spinning quality of composite fibers was improved by adding proper amount of modified nano-TiO2. When the content of modified nano-TiO2 was 1%, the composite fibers with uniform diameter distribution were obtained. Results from FTIR and TG suggested that modified nano-TiO2 had been successfully introduced to the WPU/PVA nanofibers and TiO2/WPU/PVA nanofibers had the best thermal stability when the content of modified nano-TiO2 was 1%. Results from UV-Vis suggested that the photocatalytic performance of composite nanofibers that degraded methyl orange was enhanced by the addition of modified nano-TiO2. [ABSTRACT FROM AUTHOR]

Nano-TiO2/poly(methylmethacrylate) nanofibres were prepared by electrospinning with poly(methylmethacrylate) (PMMA) and anatase nano-TiO2 as main materials which were blended mechanically and dissolved in dimethylformamide (DMF) and ethyl ethanoate (EA) solvent. The nanofibres morphologies and physical states were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetry analysis (TG), fourier transform infrared (FTIR) spectroscopy and UV–visible (UV–Vis) spectroscopy. Scanning electron microscopy observations revealed that when the content of TiO2 was 5%, nano-TiO2/poly(methylmethacrylate) nanofibres had the minimum average diameter which was 409 nm. Results from FTIR, XRD and TG suggested that anatase nano-TiO2 had been successfully introduced to the PMMA matrix and TiO2/PMMA nanofibres had good thermal stability within 300 °C. Results from UV–Vis suggested that when 10% of anatase nano-TiO2 was added, the photocatalytic decomposition of methyl orange was 50% higher than that of pure PMMA nanofibres under sunlight irradiation for 5 h. [ABSTRACT FROM AUTHOR]

R-TiO2/PMMA nanofibers were prepared by electrospinning with poly(methylmethacrylate) (PMMA) and rutile nano-TiO2 (R-TiO2) as main materials which were blended mechanically, and dimethylformamide (DMF) and ethyl ethanoate (EA) as component solvent. The nanofibers morphologies and physical states were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetry analysis (TG), fourier transform infrared (FTIR) spectroscopy and UV-visible (UV-Vis) spectroscopy. Scanning electron microscopy observations revealed that with the increase of DMF proportion in solvent the fibers average diameter gradually decreased, with the increase of EA ratio in solvent more micropores emerged, and as the content of R-TiO2 increased, the fibers average diameter decreased initially, then followed by an increase. When the content of R-TiO2 was 5%, the minimum fibers average diameter was 436 nm. Results from FTIR, XRD and TG suggested that rutile nano-TiO2 had been successfully introduced to the PMMA matrix and R-TiO2/PMMA nanofibers had good thermal stability, and heating weightlessness was less than 2% in the 300 °C. Results from UV-Vis suggested that when 10% of rutile nano-TiO2 was added, the degradation of methyl orange was 30% higher than that of pure PMMA nanofibers under sunlight irradiation. [ABSTRACT FROM AUTHOR]