三羧基丁烷膦酸锆/SPPEK复合膜在高温不同湿度下的电导率  

Conductivity of Zr(PBTC)/SPPEK composite membrane at high temperature and different humidities

作　　者：黄绵延[1] 陈华艳[1] 许莉[1] 王宇新[1] 

机构地区：[1]天津大学化工学院化学工程研究所化学工程联合国家重点实验室,天津300072

出　　处：《化工学报》2007年第12期3170-3174,共5页CIESC Journal

基　　金：国家自然科学基金项目(29976033);天津市科技发展计划项目(05YFJZJC00600)~~

摘　　要：磺化杂萘联苯聚醚酮(SPPEK)膜在温度高于100℃时会因严重失水而导致电导率急剧下降。为此,合成出具有较高电导率的吸湿性质子导体1,2,4-三羧基丁烷-2-膦酸锆[Zr(PBTC)],并将其掺杂到SPPEK中制备出Zr(PBTC)/SPPEK复合膜。实验表明,Zr(PBTC)的掺杂能有效提高复合膜在高温低湿情况下的吸水能力,从而提高其电导率。SPPEK膜在120℃、相对湿度为40%情况下电导率仅有约10-4S.cm-1,而相同条件下30%Zr(PBTC)/SPPEK复合膜的电导率达到2×10-3S.cm-1。而且相对湿度越小,复合膜电导率的提高幅度越大,在相对湿度小于20%时,复合膜的电导率大约比SPPEK膜高两个数量级。Sulfonated poly（pathalazinone ether ketone）（SPPEK）is an alternative membrane material for direct methanol fuel cells because of its reasonable conductivity and methanol resistance.However,its conductivity depends much on the water content.At a temperature higher than 100℃,the conductivity of SPPEK membrane drops sharply due to the evaporation of water.The present paper focuses on improving the water holding ability of SPPEK membrane by embedding a hygroscopic proton conductor.Zirconium tricarboxybutyl phosphonate[Zr（PBTC）]was chosen as the hygroscopic additive for its relatively high conductivity.Zr（PBTC）/SPPEK composite membrane was obtained by casting a homogeneous mixture of Zr（PBTC）and SPPEK in N,N-dimethylacetamide onto glass plate and then evaporating the solvent at 60℃.The conductivity of membranes at different relative humidities at 120℃ and the water content at different temperatures were measured.The results showed that incorporating Zr（PBTC）improved the water holding capacity of composite membranes at a low humidity,thereby improving their conductivity.At 120℃,when relative humidity varied from 100% to 20%,the conductivity of SPPEK membrane dropped sharply from 10-1 S·cm-1to 10-5 S·cm^-1 while that of 30%（mass）Zr（PBTC）/SPPEK composite membrane dropped to 10-3 S·cm^-1.

关 键 词：磺化杂萘联苯聚醚酮 复合膜 相对湿度 电导率 

分 类 号：TM911.4[电气工程—电力电子与电力传动]