基于半互穿聚合物网络的高温质子交换膜的制备  

Preparation of High-temperature Proton Exchange Membranes Based on Semi-interpenetrating Polymer Networks

作　　者：梁敏慧 王鹏[1,2] 李宏斌[2] 李天洋[1,2] 曹凯悦 彭金武 刘振超 刘佰军[1,2] LIANG Minhui;WANG Peng;LI Hongbin;LI Tianyang;CAO Kaiyue;PENG Jinwu;LIU Zhenchao;LIU Baijun(Key Laboratory of High-Performance Plastics,Ministry of Education;College of Chemistry,Jilin University,Changchun 130012,China)

机构地区：[1]吉林大学特种工程塑料教育部重点实验室,长春130012 [2]吉林大学化学学院,长春130012

出　　处：《高等学校化学学报》2020年第12期2845-2850,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51873076,52073118,52073044);吉林省科技发展计划项目(批准号:20180201076GX,20200401036GX);吉林省产业技术研究与开发基金(批准号:2019C042-4)资助.

摘　　要：通过构筑基于含不饱和双键的磺化聚芳醚酮(Allyl-SPAEK)与芳醚型聚苯并咪唑(PBI)的半互穿聚合物网络(IPN),获得综合性能优异的可用于高温质子交换膜燃料电池的PBI/Allyl-SPAEK复合膜材料.在对Allyl-SPAEK和PBI的分子进行设计和合成的基础上,采用溶液共混-浇铸方法,基于UV辐照交联,获得了由丙烯基生成的共价键和咪唑基-磺酸基形成的强酸碱相互作用组成的IPN新体系,并系统研究了新型复合膜的热、机械性能和质子传导率.结果表明,具有PBI/Allyl-SPAEK半互穿聚合物网络的复合膜具有较高的质子传导率和力学性能,在同等磷酸吸附水平和测试条件下优于PBI膜.在磷酸吸附水平为13.0左右时,PBI/Allyl-SPAEK复合膜的最大拉伸强度达到12.1 MPa,杨氏模量达到131.5 MPa,是同等磷酸吸附水平下PBI膜的2.04倍.在200℃时,两种PBI/Allyl-SPAEK复合膜的质子传导率均达到200 mS/cm以上,比PBI膜传导率提高了38%.To realize the tradeoff between high proton conductivity and high mechanical strength,a semiinterpenetrating polymer network(PIN)based on a sulfonated poly(aryl ether ketone)bearing unsaturated double bonds(Allyl-SPAEK)and an arylether-type polybenzimidazole(PBI)has been fabricated for hightemperature proton exchange membranes in fuel cells.Based on the molecular design and syntheses of Allyl-SPAEK and PBI,a new IPN system composed of covalent bond formed by allyl groups and strong acidbase interactions formed by imidazole-sulfonic acid groups was obtained through a process of solution casting and UV irradiation.The results showed that the PBI/Allyl-SPAEK membranes could have simultaneously im⁃proved proton conductivity and mechanical strength,which were much better than the pristine PBI membrane under the same phosphoric acid adsorption level and test conditions.With a phosphoric acid adsorption level of ca.13.0,the maximum tensile strength of one PBI/Allyl-SPAEK membrane was 12.1 MPa,and its young’s modulus reached 131.5 MPa,which was twice of the pristine PBI membrane.At 200℃,the proton conductivi⁃ties of two membranes reached above 200 mS/cm,which was 38%higher than that of the pristine PBI membrane.

关 键 词：燃料电池 聚苯并咪唑 磺化聚芳醚酮 半互穿交联网络 高温质子交换膜 

分 类 号：O631[理学—高分子化学]