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7 results on '"Ye, Gongbo"'

4. Synthesis and investigation of well-defined silane terminated and segmented waterborne hybrid polyurethanes

Author

Hui Zhao, Tonghui Hao, Qunchao Zhang, Da Huang, Tao Jiang, Guo-Hua Hu, Ye Gongbo, Laboratoire Réactions et Génie des Procédés (LRGP), and Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Scanning electron microscope, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Silane, Catalysis, 0104 chemical sciences, chemistry.chemical_compound, Crystallinity, [SPI]Engineering Sciences [physics], chemistry, Chemical engineering, Polymer chemistry, Triethoxysilane, Materials Chemistry, Thermomechanical analysis, Thermal stability, Fourier transform infrared spectroscopy, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, Polyurethane
Abstract

Environmentally friendly waterborne polyurethanes (WPUs) are copolymerized with (3-(2-aminoethyl)aminopropyl)triethoxysilane (AATS) and terminated with 3-aminopropyltriethoxysilane (ATS). The ATS content was kept constant and the effects of AATS on the structures and properties were investigated in terms of crystallinity, thermal stability, mechanical properties, dynamic thermo-mechanical properties and surface behavior. Fourier transform infrared spectroscopy (FT-IR) analysis confirmed the existence of a hydrogen bonding interaction at the interface between the polyurethane and siloxane moieties. As the AATS content increased, the crystallinity decreased slightly as revealed using wide angle X-ray diffraction (XRD), the surface of the waterborne polyurethanes became much smoother as observed through a scanning electron microscope (SEM), the Si element content on the surface was enriched as confirmed using X-ray photoelectron spectroscopy (XPS), and the microphase separation was enhanced as shown using dynamic thermomechanical analysis (DMA). The incorporation of AATS led to an increase in hydrophobicity, tensile strength, Young’s modulus, as well as thermal stability but a decrease in the elongation at break of the WPU films.

Published
2017

7. Self-assembled Nafion®/metal oxide nanoparticles hybrid proton exchange membranes

Author

Li, Ke, Ye, Gongbo, Pan, Jingjing, Zhang, Haining, and Pan, Mu

Subjects
*METALLIC oxides, *NANOPARTICLES, *PROTON exchange membrane fuel cells, *ARTIFICIAL membranes, *HIGH temperatures, *HUMIDITY, *COPOLYMERS
Abstract

Abstract: One of the very important barriers for proton exchange membrane fuel cells (PEMFCs) is the decrease in proton conductivity of membrane at elevated temperature and low relative humidity. In this study, inorganic–organic hybrid membranes have been developed in order to improve water retention and proton conductivity at elevated temperature. Using in situ self-assembly technique, the well-dispersed metal oxide nanoparticles (SiO2, ZrO2) with diameters of ∼5nm can be formed through sol–gel process in Nafion® dispersion. It was found that the doped metal oxide nanoparticles did not affect the crystallinity and structure of Nafion® in the membrane significantly. Compared to Nafion® membrane, hybrid membranes show better water retention properties and higher proton conductivity at relatively low relative humidity. [Copyright &y& Elsevier]

Published
2010
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