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Effects of functionalized silica Nanoparticles on Characteristics of Nanocomposites PES Cation Exchange Membranes

Journal of Wuhan University of Technology(Materials Science) 2017年第6期32卷 1239-1249页

作者： GARMSIRI Mahdi MORTAHEB Hamid Reza MOGHADASI Mahdieh Chemistry and Chemical Engineering Research Center of lran Tehran P.O.Box: 14335-186 Iran

Nanocomposite cation exchange membranes（CEMs） were prepared by adding various loadings of functionalized silica nanoparticles to the sulfonated polyethersulfone（s PES） polymeric matrix. The silica nanoparticles were functionalized by mercaptopropyl（F1, IEC=0）, propylsulfonic acid（F2, IEC= 2.71）, and sulfonic acid（F3, IEC=2.84）. The properties of prepared membranes were investigated by varying the loadings of functionalized silica nanoparticles. Applying functionalized nanoparticles provides additional ion exchange groups and enhances water contents as well as conductivities and permselectivities of the membranes. The maximum IEC of 1.9 meq.g^-1 was obtained for the membrane having 3 wt% F3 nanoparticles and the maximum conductivity of 0.237 S·cm^-1 was achieved for the membrane having 2 wt% F3 nanoparticles, which were 19.6% and 64% higher than the corresponding values for s PES membrane, respectively. The excellent properties of the nanocomposite cation-exchange membranes make them appropriate candidates for electrodialysis and desalination processes.

关键词： functionalized silica nanocomposite membrane cationic exchange membrane polyethersulfone transport properties

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SYNTHESIS OF CATALYSIS BY THE FUNCTIONALIZATION OF silica AND ITS APPLICATIONS

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Chinese Journal of Polymer Science 1999年第1期17卷 1-12页

作者： Yasuhiko Kurusu Department of Chemistry Sophia University 7-1 Kioicho Chiyoda-ku Tokyo Japan 102

Hybrid organic-inorganic silica materials containing organic functional groups have been preparedby the reaction of activated silica with a silane coupling reagent such as N-(2-aminoethyl)3-aminopropyltrimethoxysilane. The hybrid silica was further modified by organic compounds having abifunctional group. These modified hybrid silicas were used as catalysts for various nucleophilic *** also, these were complexed with metallic ions for use as catalysts for oxygen oxidation of hydrocarbons.

关键词： Organic-inorganic hybrid polymer functionalized silica Dioxygen oxidation of hydrocarbon Reaction with functionalized silica

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Functionalization of silica Surface with UV-Active Molecules by Multivalent Organosilicon Spacer

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Open Journal of Inorganic Chemistry 2016年第3期6卷 163-174页

作者： Olga Iliashevsky Elina Rubinov Yafa Yagen Moshe Gottlieb Chemical Engineering Department Ben Gurion University of the Negev Beersheva Israel

Immobilization of active molecules by attachment onto solid surfaces is a well-established practice in many processes and applications. silica micro- and nano-particles are attractive candidates as support for active molecules as a result of a combination of desirable properties. The present study deals with grafting of a functional UV active molecule onto silica surfaces via hydrosilylation reactions using multivalent organosilicon spacers. Different types of organosilicon precursors based on dimethylsiloxysilanes containing multiple SiH groups were used as spacers between vinyl-modified silica surface and the benzotriazole UV-absorber (UVA). Firstly, the surface of silica was modified with vinyltrimetoxsisilane coupling agent. The UVA molecules were attached to the silica-vinyl by a two-step procedure involving hydrosilylation reaction. The successful grafting was confirmed by FTIR, TGA and UV-Vis characterization. More than fivefold increase in UVA loading was found for the MH30 multifunctional spacer, which contains approximately 75 SiH groups per molecule, when compared to a four-functional spacer. Furthermore a branched, bulky six-functional spacer is preferred over a linear spacer of the same functionality. UV activity of functionalized silica was studied by UV-Vis spectroscopy, indicating that the immobilization of UVA onto silica surface has not altered its UV absorbance properties.

关键词： silica functionalized silica UV Absorbers Hydrosilylation Organosilicon

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紫外光固化水性聚氨酯/改性二氧化硅复合材料的制备与性能研究

紫外光固化水性聚氨酯/改性二氧化硅复合材料的制备与性能研究

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2012年全国高分子材料科学与工程研讨会

作者：张丽慧蔡辰婷马正峰郭金山兰州大学化学化工学院高分子材料与工程研究所

＜正＞水性聚氨酯（WPU）的零/低挥发性有机物含量（VOC）使其成为一种绿色环保材料,引起了学术领域和商业领域的广泛关注。然而,水性聚氨酯的机械性能和耐水耐溶剂性能通常较差。交联和复合是两种可以有效改善水性聚氨酯材料性能的方... 详细信息

＜正＞水性聚氨酯（WPU）的零/低挥发性有机物含量（VOC）使其成为一种绿色环保材料,引起了学术领域和商业领域的广泛关注。然而,水性聚氨酯的机械性能和耐水耐溶剂性能通常较差。交联和复合是两种可以有效改善水性聚氨酯材料性能的方法。在过去的研究中,水性聚氨酯通常与二氧化硅、二氧化钛、凹凸棒土等无机物复合形成复合材料。但有机分子和无机颗粒之间的相容性一般较差,无机颗粒容易团聚,所以无机物的添加量受到限制。实

关键词： WPU UV-curable functionalized silica composites

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