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首页> 外文期刊>Separation and Purification Technology >Pervaporation separation of organic azeotrope using poly(dimethyl siloxane)/clay nanocomposite membranes
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Pervaporation separation of organic azeotrope using poly(dimethyl siloxane)/clay nanocomposite membranes

机译：使用聚二甲基硅氧烷/粘土纳米复合膜对有机共沸物进行全蒸发分离

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The paper describes the preparation of poly(dimethyl siloxane) (PDMS)/clay nanocomposite membranes by in situ crosslinking of vinyl terminated PDMS (V-PDMS) resin in the presence of clay content varying from 1% w/w to 10% w/w in order to evaluate the influence of layered silicate on pervaporation characteristics of PDMS. Two commercial clays, Cloisite 30B and Nanomer 1.30P functionalized with polar and nonpolar surfactants were chosen for this purpose and PDMS membranes were prepared in the absence/ or presence of varying amounts of different clays. Structural, mechanical and thermal characterization was done using Fourier transform infrared spectroscopy (FTIR), tensile testing system and thermogravi-metric analyzer. Morphological characterization using X-ray diffraction and transmission electron microscopy showed intercalation or partial exfoliation of silicate layers. Surface characterization using scanning electron microscope showed an uniform dispersion of nanoclays in PDMS matrix. Two nanocomposite membranes having PDMSanoclay (10% w/w) were selected based on their mechanical properties and evaluated for their performance in separating azeotropic toluene/methanol mixture. Composite membranes showed higher selectivity as compared to neat PDMS and toluene was a preferred permeant. The total flux for composite membranes was lower as compared to PDMS membrane. This study demonstrates that polymer nanocomposite membranes could be an alternative way for tuning between permeation flux and selectivity in addition to enhanced thermal and mechanical properties.
机译：本文描述了在黏土含量从1％w / w到10％w / w的情况下，乙烯基端基PDMS（V-PDMS）树脂的原位交联制备聚二甲基硅氧烷（PDMS）/粘土纳米复合膜的方法。 w为了评估层状硅酸盐对PDMS渗透特性的影响。为此，选择了两种用极性和非极性表面活性剂官能化的商业粘土，Cloisite 30B和Nanomer 1.30P，并在不存在或存在不同数量的不同粘土的情况下制备了PDMS膜。使用傅立叶变换红外光谱（FTIR），拉伸测试系统和热重分析仪对结构，机械和热进行表征。使用X射线衍射和透射电子显微镜的形态学表征显示了硅酸盐层的插入或部分剥落。使用扫描电子显微镜的表面表征显示了纳米粘土在PDMS基质中的均匀分散。基于其机械性能选择具有PDMS /纳米粘土（10％w / w）的两种纳米复合膜，并评估其在分离共沸甲苯/甲醇混合物中的性能。与纯PDMS相比，复合膜具有更高的选择性，并且甲苯是首选的渗透剂。与PDMS膜相比，复合膜的总通量更低。这项研究表明，除了增强的热和机械性能外，聚合物纳米复合膜还可以作为在渗透通量和选择性之间进行调节的替代方法。

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