多层界面聚合法制备质子传导膜研究  

Preparation of proton conductive membranes using layer-by-layer interfacial polymerization processes

作　　者：郭伟男[1] 吴旭冉[1] 青格乐图[1] 范永生[1] 王保国[1] 

机构地区：[1]清华大学化学工程系,北京100084

出　　处：《膜科学与技术》2014年第4期6-11,共6页Membrane Science and Technology

基　　金：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)

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8.0×10-3 S/cm;VO2+离子扩散系数降低了一个量级,达到2.4×10-12 m2/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 VO^2＋,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^-3 S/cm,VO^2＋ diffusion coefficient decreases by 90%,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.

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 

分 类 号：TQ051.893[化学工程]