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Preparation and Characterization of Organic-inorganic Multi-alkoxy Silicon Hybrid Membranes

Author: WangHui
Tutor: XuTongWen
School: University of Science and Technology of China
Course: Applied Chemistry
Keywords: Hybrid membrane Sol-gel Cation-exchange membrane Polyvinyl alcohol Sulfonated polyphenylene ether Diffusion dialysis
CLC: TQ264.1
Type: Master's thesis
Year: 2010
Downloads: 93
Quote: 0
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Abstract


Organic - inorganic hybrid by blending method, in situ polymerization, sol - gel method, such as the introduction of inorganic particle organic network, which will combine good organic components and inorganic components. Therefore organic - inorganic hybrid membranes of both the organic film and the advantages of inorganic membranes the film enhanced mechanical properties, thermal stability, and solvent resistance are greatly improved. The other hand, the organic - inorganic hybrid materials used in ion-exchange membrane field, improve the ion-exchange membrane at high ionic exchange capacity, high swelling nature. The same time as the introduction of the inorganic component, the membrane permeability, selectivity also possible to obtain a great degree of improvement. Therefore the rapid development in recent years. In this paper, the sol - gel (sol-gel), and blending the prepared organic - inorganic hybrid non-ionic membrane and organic - inorganic hybrid cation exchange membrane, and test some of the film's basic physical and chemical properties, particularly for Hybrid cation exchange membrane, the first applied to diffusion dialysis recycling alkali applications. Experimental procedures and experimental data as follows: (1) to ethylenediamine (EDA), chloromethyl the triethoxysilane (CMTES) and polyvinyl alcohol (PVA) as raw material, by first preparing small molecule of EDA and CMTE silicon compounds, followed by the sol - gel method with PVA reaction prepared hybrid film. Examines the The content of CMTES and the solvent, the influence of the catalyst on the film-forming properties. By thermal analyzer (TG-DSC), scanning electron microscopy (SEM) and mechanical properties test the physical and chemical properties and thermal stability of the film, and the film attempts to applications in pervaporation separation of ethanol / water system. Experimental results show that KOH as catalyst, ethanol as a solvent obtained hybrid membrane showed good physical and chemical properties. (2) with acrylic acid (AA), gamma-methacryloxypropyl trimethoxy silane (γ-MPS) and polyvinyl alcohol (PVA) as raw materials by the sol - gel prepared by reacting multi-silicon copolymer hybrid cationic exchange membrane, investigated the influence of the different content of a copolymer of poly (AA-co-γ-MPS) on membrane performance. The series film having a good thermal stability (thermal degradation temperature of 264-270 ° C) and mechanical properties. And with copolymer content increases, the hydrophilicity of the film decreased by (81.6 - 70.8%), ion exchange capacity (0.76-0.90 mmol / g) is gradually increased. Finally, the membrane used in diffusion dialysis separation NaOH and Na 2 WO 4 system showed better separation (dialysis coefficient :0.010-0 .042 m / h). 35 ℃, containing poly (AA-co-gamma-MPS) 50% of the mass fraction of the hybrid film diffusion dialysis test, the separation factor of up to 95.7. (3) acrylic acid (AA), gamma-methacryloxypropyl trimethoxy silane (γ-MPS), and sulfonated polyphenylene ether (SPPO) blend prepared by a cation exchange membrane, as raw materials through investigated of SPPO content on membrane performance. Explore the feasibility of the application of the membrane in the direction of separation of alkali system.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of organic compounds of elements > The first IV group elements, organic compounds , > Silicon organic compounds
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