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To strengthen waterborne polyurethane/polyvinyl alcohol nanofibers which is a potential filtering material, in this work, modified graphene oxide (GO) was mixed into the solution of waterborne polyurethane and polyvinyl alcohol. By electrospinning, the modified GO/waterborne polyurethane/polyvinyl alcohol nanofibers were prepared. The composite nanofibers showed good thermal behavior due to the addition of modified GO. The results show that the maximum thermal decomposition temperature of nanofibers film increased by 26 °C when the content of modified GO was 0.4% in the composite nanofiber. At the same time, the tensile property of the composite nanofiber was improved and a better mechanical behavior appeared when using a rotating way to fabricate the nanofibers, which the value of tensile length at break in the radial direction and tensile strength at break in arc direction rose by 68.7% and 38.7% separately. [ABSTRACT FROM AUTHOR]

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]

PVA/P(AA-AM) super absorbent polymer was prepared with polyvinyl alcohol (PVA), acrylic acid (AA) and acrylamide (AM) as main materials by solution polymerization. The morphologies and composite physical states were investigated using fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetry analysis (TG-DTG). Scanning electron microscopy observations revealed that a large number of porous network structures existed in the resin. Results from FTIR and XRD suggested that PVA/P(AA-AM) superabsorbent which had semi-interpenetrating network structure had been successfully prepared. Results from TG-DTG suggested that PVA/P(AA-AM) superabsorbent had good thermal stability under 200°C. At the same time it had good water retention property and the water retention property of sandy soil was improved obviously when the resin was added into the sandy soil. [ABSTRACT FROM PUBLISHER]