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多层界面聚合法制备质子传导膜研究

作者：郭伟男，吴旭冉，青格乐图，范永生，王保国

单位：清华大学化学工程系，北京100084

关键词：质子传导膜；多层界面聚合;电导率;离子选择性;结构电荷密度

DOI号：

分类号： TQ152

出版年,卷(期):页码： 2014,34(4):6-11

摘要：

以多乙烯多胺类物质和均苯三甲酰氯为反应单体，采用多层界面聚合方法制备质子传导膜。在聚偏氟乙烯超滤膜表面进行多层界面聚合反应形成离子选择性分离膜，该膜具有质子传导能力和VO2+离子阻隔能力。通过系统研究水相溶液中单体种类对质子传导膜性能的影响，结果表明以四乙烯五胺为水相单体制得的质子传导膜电化学性能较优，其电导率达到8.0×10-3S/cm；VO2+离子扩散系数降低了一个量级，达到2.4×10-12m2/s；离子选择性系数60，较改性前提高2.2倍。研究发现膜的离子选择性和膜致密层高分子链结构电荷密度之间存在相关性。

Layer-by-layer interfacial polymerization method was used to form super-thin selective layer on PVDF ultrafiltration membrane surface, using polyethylene polyamine and 1,3,5-benzenetricarbonyl trichloride as reactants. The membranes show good permeaselectivity for proton conductivity and resistance to VO2+, membrane performances are highly affected by the species of hydrophilic monomer reactant. Membranes prepared with Tetraethylenepentamine as the hydrophilic monomer showed better electrochemical performance, of which the conductivity reaches 8.0×10-3S/cm, VO2+ diffusion coefficient decreases by 90 percent, ion selectivity increases by 2.2 times to 60. Moreover, the ion selectivity of this membrane is highly related with the charge density of the used monomer in interfacial polymerization processes.

基金项目：

国家自然科学基金资助项目（21276134）；国家高技术研究发展计划（863计划）（2012AA051203）;国家重点基础研究发展计划（973计划）项目（2010CB227202）

作者简介：

王保国，教授，清华大学化工系，010-62788777，bgwang@tsinghua.edu.cn

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