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Zhou H.,CAS Hefei Institutes of Physical Science | Wang H.,CAS Hefei Institutes of Physical Science | Tian X.,CAS Hefei Institutes of Physical Science | Zheng K.,CAS Hefei Institutes of Physical Science | Cheng Q.,Jiangsu Hehai Nanometer Science and Technology Co.
Progress in Organic Coatings | Year: 2014

A series of waterborne polyurethane (WPU) dispersions modified with different contents of 3-aminopropyltriethoxysilane (APTES) were synthesized based on poly(1,6-hexyl 1,2-ethylcarbonate) diol (PHEC) and isophorone diisocyanate (IPDI), and the films were obtained by casting the dispersions on Teflon molds. Effects of APTES content on the particle size and viscosity of the dispersions were studied. The structure and properties of the resulting films were investigated by Fourier transform infrared spectroscopy, wide angle X-ray diffraction measurement, dynamic mechanical analysis, thermogravimetric analysis and mechanical testing. The experimental results showed that the incorporation of APTES played an important role in the enhancement of the water and toluene resistance and mechanical properties of the SPU films. Young's moduli and ultimate tensile strengths were improved from 8.0 to 451 MPa and 6.5-19 MPa respectively as the APTES content increased from 1 wt.% to 20 wt.%. The ability of scratch resistance was enhanced, when the content of APTES increased to 20 wt.%, the 3H pencil could not mar the surface. Moreover, the transmittance spectra indicated that the coatings showed high transparence. © 2014 Elsevier B.V.


Zhou H.,CAS Hefei Institutes of Physical Science | Wang H.,CAS Hefei Institutes of Physical Science | Tian X.,CAS Hefei Institutes of Physical Science | Zheng K.,CAS Hefei Institutes of Physical Science | Cheng Q.,Jiangsu Hehai Nanometer Science and Technology Co.
Polymer Composites | Year: 2014

Various amounts of antimony doped tin oxide (ATO) nanoparticles were incorporated into waterborne polyurethane (WPU) dispersions by sol-gel reactions. The dispersion state and morphology investigated by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) showed that the nanoparticles can disperse in the matrix uniformly. The analysis of visible-near infrared spectra (VIS-NIR) suggested that the WPU/ATO coatings show both low near infrared transmittance (35%) and high visible light transmittance (76%). The heat-insulation effect measurement demonstrated that the WPU/ATO coatings could prevent heat transmission effectively. It was also found that the introduction of ATO nanoparticles can improve the mechanical properties significantly. POLYM. COMPOS., 35:1169-1175, 2014. © 2013 Society of Plastics Engineers © 2013 Society of Plastics Engineers.


Xiong P.,Nanjing University of Science and Technology | Xiong P.,Changzhou University | Wang L.,Nanjing University of Science and Technology | Sun X.,Changzhou University | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2013

A straightforward strategy is designed for the fabrication of magnetically recyclable ternary titania-cobalt ferrite-polyaniline (P25-CoFe 2O4-PANI) photocatalysts with differing P25/CoFe 2O4 ratio. The pseudo-second-order and Langmuir models are found to be most suitable for describing the adsorption of methyl orange (MO) onto the photocatalysts. The photocatalytic activity of P25-CoFe 2O4-PANI is evaluated by the degradation of various dyes under visible light irradiation, and the results show that the ternary P25-CoFe2O4-PANI photocatalyst exhibits high photocatalytic activity due to the good adsorption capacity of the hybrid and the introduction of P25, which can further improve the separation of the light-induced electron-hole pairs. The degradation of anionic dyes is much more effective than that of cationic dyes due to the negatively charged groups of anionic dyes undergo electrostatic attraction with the positively charged backbone of PANI, and such an effective adsorption helps in promoting the degradation. © 2013 American Chemical Society.


Sun J.,Nanjing University of Science and Technology | Sun J.,Changzhou University | Fu Y.,Nanjing University of Science and Technology | Xiong P.,Nanjing University of Science and Technology | And 3 more authors.
RSC Advances | Year: 2013

A straightforward strategy is designed for the fabrication of a magnetically separable P25/CoFe2O4/graphene photocatalyst with differing P25 contents via a facile one step hydrothermal approach. TEM observations show that graphene sheets are exfoliated and decorated with well-dispersed TiO2 and CoFe2O4 nanoparticles. The adsorption capacity and visible-light-driven photocatalytic activity are evaluated in terms of the efficiencies of adsorption and photodegradation of various dyes, including methylene blue (MB), methyl orange (MO) and neutral dark yellow (DY). The evaluation results demonstrate that the P25/CoFe 2O4/graphene photocatalyst exhibits the best performance among P25/CoFe2O4/graphene (PCG), CoFe2O 4/graphene (CG), P25/CoFe2O4 (PC) and P25/graphene (PG) photocatalysts, not only in the adsorption progress, but also in the photocatalytic degradation. The significant enhancement after combination can be attributed to the synergistic effect among individual components. Furthermore, CoFe2O4 nanoparticles themselves have excellent magnetic properties, which are largely maintained in the composite, and therefore, it is no longer necessary to introduce additional magnetic supports for magnetic separation in a suspension system. This journal is © The Royal Society of Chemistry 2013.

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