Plasma-graft filling polymerization: preparation of a new type of pervaporation membrane for organic liquid mixtures
Plasma-graft filling polymerization: preparation of a new type of pervaporation membrane for organic liquid mixtures
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DOI：
10.1021/ma00020a006
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发表时间：
1991-09
期刊：
影响因子：
5.5
通讯作者：
Takeo Yamaguchi;S. Nakao;S. Kimura
中科院分区：
文献类型：
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作者：
Takeo Yamaguchi;S. Nakao;S. Kimura
提出了一种用于有机液体分离的新型膜——填充聚合膜。抑制膜的溶解度差异和抑制膜的溶胀是开发有机液体超选择膜的关键。膜由两种高分子材料组成。一种是多孔衬底膜，对有机液体是惰性的，另一种是聚合物，只溶于特定溶剂，填充衬底孔隙。填充聚合物的溶解度差异导致了过电选择性，而衬底基质抑制了填充聚合物的溶胀。本研究采用等离子体接枝聚合技术制备了填充聚合膜。以多孔高密度聚乙烯薄膜和聚丙烯酸甲酯为基体和接枝聚合物；这种接枝聚合物可溶于芳香烃，如苯，但不溶于脂肪烃，如环己烷。通过TEM和FT-IR对接枝膜的形貌分析表明，接枝聚合物填充了基质的孔隙。在苯/环己烷混合物中进行的膜膨胀实验证实，基质抑制了接枝聚合物的膨胀。通过制备的膜对苯/环己烷混合物进行了渗透汽化分离。接枝聚合物填充了基底膜的孔隙，从而实现了对苯的高选择性分离。抑制膜膨胀提高了膜的选择性，符合填充聚合膜的概念。
A new membrane for organic liquid separation, called the filling-polymerized membrane, is proposed. To develop an organic liquid permselective membrane, suppressing membrane swelling as well as enhancing thesolubility difference is important. The membrane is composed of two kinds of polymer materials. One is a poroussubstrate film, which is inert to organic liquids, and the other is a polymer, soluble only in specific solvents, filling the substrate pores. The solubility difference of the filling polymer causes permselectivity while the substrate matrix restrains the swelling of the filling polymer. In the present study, the filling-polymerized membrane was prepared by the plasma-graft polymerization technique. A porous high-density polyethylene film and poly (methyl acrylate) were used as the substrate and grafted polymer, respectively; this grafted polymer is soluble in aromatic hydrocarbons, such as benzene, but insoluble in aliphatic hydrocarbons, such as cyclohexane. Morphological analysis of the grafted membrane by TEM and FT-IR analysis showed that the grafted polymer filled the pores of the substrate. The membrane swelling experiments in a benzene/cyclohexane mixture verifiedthat the matrix of the substrate restrained the swelling of the grafted polymer. Pervaporation separation of the benzene/cyclohexane mixture through the membranes obtained was carried out. The separation took place through the grafted polymer, which filled the pores of the substrate film, and the membranes showed high permselectivity for benzene, as expected. Suppressing membrane swelling raised the selectivity in accordance with the concept of the filling-polymerized membrane.