Copoly(arylene ether nitrile) and copoly(arylene ether sulfone) ionomers with pendant sulfobenzoyl groups for proton conducting fuel cell membranes
作者:Elin Persson Jutemar、Patric Jannasch
DOI:10.1002/pola.24486
日期:2011.2.1
6‐difluorobenzonitrile (DFBN), and 2,7‐DHN. In the third series, bis(4‐fluorophenyl)sulfone was used instead of DFBN to prepare copoly(arylene ether sulfone)s. Thus, all the ionomers had sulfonic acid units placed in stable positions close to the electron withdrawing ketone link of the side chains. Mechanically strong proton‐exchange membranes with IECs between 1.1 and 2.3 meq g−1 were cast from dimethylsulfoxide
通过K 2 CO 3制备了三个具有萘基和侧基磺基苯甲酰侧链的全芳族离聚物。介导的亲核芳香取代反应。第一个系列由通过2,6-二氟-2'-磺基二苯甲酮(DFSBP)和2,6-二羟基萘或2,7-二羟基萘(2,7-DHN)的缩聚反应制得的聚亚芳基醚组成。在第二系列中,通过DFSBP,2,6-二氟苄腈(DFBN)和2,7-DHN的缩聚反应制备了具有不同离子交换容量(IEC)的共聚(亚芳基醚腈)。在第三系列中,使用双(4-氟苯基)砜代替DFBN制备共聚(亚芳基醚砜)。因此,所有离聚物的磺酸单元均位于稳定的位置,靠近侧链的吸电子酮键。机械强度高的质子交换膜,IEC介于1.1和2.3 meq g -1之间由二甲基亚砜溶液浇铸而成。取决于IEC,高热稳定性是由266至287°C(空气中1°C min -1)下的高降解温度和245至306°C之间的高玻璃化转变温度所决定的。在完全湿润的条件下,共聚物膜的质子电导率达到0