PVA/SiO_2阴离子交换膜的制备与性能研究  

Preparation and characterization of PVA/SiO_2 membrane

作　　者：赵世怀 张旭平[1,2] 陶超[2] 尹静[2] 张爱旭[2] 郭云露 

机构地区：[1]省部共建分离膜与膜过程国家重点实验室,天津300387 [2]天津工业大学环境与化学工程学院,天津300387

出　　处：《化工新型材料》2017年第4期82-84,共3页New Chemical Materials

基　　金：天津市自然科学基金重点项目(12JCZDJC28400);天津市科技计划项目(15PTSYJC00230);国家自然科学基金(21476172;21206124)

摘　　要：聚乙烯醇(PVA)是一种良好的成膜材料,具有亲水性高、阻醇性好等特点,可用于直接醇类燃料电池。采用正硅酸乙酯(TEOS)作为无机相SiO_2的前驱物,戊二醛作为交联剂,与PVA溶液进行溶胶-凝胶和交联反应,形成醇相-PVA/SiO_2膜和水相-PVA/SiO_2膜。以纯PVA膜为参考,对2种复合膜的微观形貌、热稳定性、含水量、溶胀率、乙醇渗透率和离子导电率等性能进行了考察。结果表明:复合膜中SiO_2有效地掺杂到PVA结构中,具有良好的稳定性,降低了PVA膜的溶胀率,提高了阻醇性和离子导电率。而且,醇相-PVA/SiO_2膜性能优于水相-PVA/SiO_2膜,更适合作为燃料电池中的阴离子交换膜。It is well established that polyvinyl alcohol（PVA）can be utilized as a membrane in direct alcohol fuel cells due to its advantages of good hydrophilicity and alcohol resistance.PVA/SiO_2 composite membranes were prepared by using tetraethoxysilane（TEOS）as the precursor of inorganic SiO_2 in either water phase（marked as W-PVA/SiO_2）or alcohol phase（marked as E-PVA/SiO_2）.The properties of synthesized membranes,such as microscale morphology,thermal stability,swelling ratio,ethanol permeability and ion conductivity were investigated.The results showed that the membranes had higher swelling ratio,alcohol resistance and ionic conductivity.By contrast,E-PVA/SiO_2 membrane showed better performance than W-PVA/SiO_2,and could be more suitable for fuel cells＇ applications.

关 键 词：聚乙烯醇 SIO2 醇相 乙醇渗透率 离子电导率 

分 类 号：TQ425.236[化学工程]