基于侧链接枝改性合成了一系列具有醚氧-烷基-醚氧链段间隔分布的三阳离子侧链型聚苯并咪唑膜(oat-PBI-x)。侧链中两段柔性的含醚链段有助于亲水通道和氢键网络的形成,促进OH^-快速传递,而己烷基间隔段可打破侧链全亲水属性,有效抑制膜过度溶胀。在IEC为1.40 mmol/g时膜的综合性能达到最佳。80℃时电导率为144.4m S/cm,拉伸强度保持在21 MPa,在80℃、1 mol/L KOH溶液中浸泡900h后电导率保留率为91.7%。将其应用于H₂/O₂燃料电池,可在1549 mA/cm²的高电流密度下达到611 mW/cm²的峰值功率密度。

A series of polybenzimidazole-based anion exchange membranes with ether-alkyl spaced tri-cationic side chains (oat-PBI-x) are synthesized.The two flexible ether-containing segments in the side chain greatly contribute to the formation of hydrophilic ionic channels and hydrogen bond networks,promoting OH^- ions to transfer rapidly,while the hexyl spacer segments can weak the hydrophilic property of the side chain and effectively inhibit the membranes from swelling excessively.The membrane achieves the optimal comprehensive performance when IEC is 1.40 mmol·g^-1.That is,oat-PBI-1.40 membrane possesses a high hydroxide conductivity of 144.4 mS·cm^-1 at 80℃,and a tensile strength of 21 MPa.After the membrane has been soaked in 80℃,1 mol·L^-1 KOH solution for about 900 h,the conductivity remains around 91.7%.As oat-PBI-1.40 membrane is applied in H₂/O₂ fuel cell,a peak power density of 611 mW·cm^-2 can be achieved at 80℃ under a current density as high as 1,549 mA·cm^-2.

杨睿祯(1997-),男,硕士生,研究方向为阴离子交换膜,Erui1759833774@163.com;吴雪梅(1971-),女,博士,教授,研究方向为化学工程,通讯联系人,xuemeiw@dlut.edu.cn。