一步法制备两性离子交换膜的方法与性能研究  

Preparation of Amphoteric Ion Exchange Membranes via an One-Step Method and Their Properties

作　　者：费哲君 王树博[1] 李存璞 张雪飞[1] 赵玉彬[1] 谢晓峰[1] 黄海燕[2] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《高校化学工程学报》2016年第4期926-932,共7页Journal of Chemical Engineering of Chinese Universities

摘　　要：通过一步法制备了一种新型的偏氟聚芴醚噁二唑两性离子交换膜。以十氟噁二唑与双酚芴为单体聚合得到基础聚合物,通过芳香亲核取代反应在基础聚合物上引入官能团制备了一种含氟聚芳芴醚噁二唑两性离子交换膜。基于密度泛函理论对官能化反应的活性位点和反应能垒进行了预测,模拟计算结果与核磁分析谱图吻合良好。制备的两性离子膜具有相对较高的离子传导率,较低的钒渗透性。70℃时,传导率为58.5 m S?cm?1;钒离子渗透系数为8 2 11.56 10 cm min????,比Nafion?117小两个数量级,有望用于全钒液流电池中。A new amphoteric ion exchange membrane was prepared via an one-step method. The membrane was based on a polymer prepared with 2,5-bis（2,3,4,5,6-pentafluorophenyl）-1,3.4-exadiazole and 9,9-bis（4-hydroxyphenyl） fluorene as monomers. Functional groups were introduced into the polymer by nucleophilic aromatic substitution reaction to prepare the amphoteric ion exchange membrane. Active sites and reaction energy barrier were predicted using a density functional theory. The results show that simulation analysis and 1H and 19F NMR spectra are consistent. The prepared membrane has a higher ionic conductivity and lower permeability of vanadium ion. The conductivity is 58.5 mS.cm^-1 at 70℃ and vanadium ion permeability coefficient is 1.56×10^-8 cm^2·min^-1 which is two orders of magnitude less than the permeability of Nation 117. This membrane can possibly be used for vanadium redox flow battery production.

关 键 词：芳香亲核取代:密度泛函理论 两性离子交换膜:阻钒性 

分 类 号：TQ028.8[化学工程]