Preparation and high oxygen-enriching properties of cross-linking polydimethylsiloxane/SiO2 nanocomposite membranes for air purification
Preparation and high oxygen-enriching properties of cross-linking polydimethylsiloxane/SiO2 nanocomposite membranes for air purification
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DOI：
10.1002/aic.13860
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发表时间：
2013-02
期刊：
影响因子：
3.7
通讯作者：
Huaxin Rao;Zi-yong Zhang;Ye Tian
中科院分区：
文献类型：
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作者：
Huaxin Rao;Zi-yong Zhang;Ye Tian
以聚二甲基硅氧烷(PDMS)和纳米二氧化硅为原料，通过方便、温和的溶胶-凝胶共聚和交联反应，制备了聚二甲基硅氧烷(PDMS)/纳米二氧化硅纳米复合膜。研究了不同SiO_2转化率和SiO_2含量的交联型PDMS/SiO_2纳米复合膜的富氧性能。结果表明，纳米复合膜具有良好的成膜能力、优异的力学性能、较高的耐溶剂性以及良好的空气净化富氧性能。在溶胶-凝胶合成过程中，富氧性能受有机/无机比和二氧化硅转化率的影响。纳米SiO_2的加入可以同时提高膜的渗透率和选择性。纳米复合膜的氧渗透系数提高到680Barrer，氧氮分离系数保持在3.0左右，均高于相应的纯PDMS膜。纳米复合膜的高富氧性能源于SiO_2粒子的引入、溶胶-凝胶共聚和交联法。©2012美国化学工程师学会学报，59：650-655,2013
Nanocomposite membrane based on polydimethylsiloxane (PDMS) and nanoscale SiO2 particles were prepared by a convenient and mild sol–gel copolymerization of tetraethoxysilane as well as cross-linking reaction. The oxygen-enriching properties of cross-linking PDMS/SiO2 nanocomposite membranes containing different silica conversion and SiO2 contents were investigated. The results showed that the nanocomposite membranes exhibited good membrane-forming ability, superior mechanical properties, and high solvent resistance as well as excellent oxygen-enriching properties for air purification. The oxygen-enriching performance was regulated by the organic/inorganic ratio and silica conversion in the sol–gel synthesis process. Permeability and selectivity could increase simultaneously with the addition of nanoscale SiO2. The oxygen permeation coefficient of the nanocomposite membrane increased to 680 Barrer and oxygen/nitrogen separation factor kept 3.0 or so, both higher than those of the corresponding pure PDMS membrane. The high oxygen-enriching properties of the nanocomposite membranes arose from the introduction of SiO2 particles, the sol–gel copolymerization, and cross-linking method. © 2012 American Institute of Chemical Engineers AIChE J, 59: 650–655, 2013