Thermoplastic interpenetrating polymer networks based on polybenzimidazole and poly (1, 2-dimethy-3-allylimidazolium) for anion exchange membranes
Thermoplastic interpenetrating polymer networks based on polybenzimidazole and poly (1, 2-dimethy-3-allylimidazolium) for anion exchange membranes
复制标题
用于阴离子交换膜的基于聚苯并咪唑和聚(1, 2-二甲基-3-烯丙基咪唑鎓)的热塑性互穿聚合物网络
DOI：
10.1016/j.electacta.2017.09.126
复制
发表时间：
2017
影响因子：
6.6
通讯作者：
He Gaohong
中科院分区：
文献类型：
--
作者：
Lin Jingjing;He Gaohong;Chen Wanting;Zhen Dongxing;Li Tiantian;Ma Lin;Wu Xuemei;Yan Xiaoming;He Gaohong
基于聚[2,2'-（对氧二亚苯基）-5, 5'-联苯并咪唑]（OPBI）和聚（1, 2-二甲基-3-烯丙基咪唑）（PDAIm）（PBI/DAIm TIPN）开发了一系列新型热塑性互穿聚合物网络（TIPN）阴离子交换膜（AEM）。通过 1, 2-二甲基-3-烯丙基咪唑鎓 (DAIm) 在 OPBI 聚合物链存在下聚合，两种未交联的聚合物链，即 PDAIm 和 OPBI 相互渗透，形成物理交联网络。 SEM和SAXS证明，与共混网络和半互穿网络相比，DAIm单体和非共价交联互穿聚合物链的小空间位阻效应有助于TIPN更好的相容性和链柔韧性，促进亲水基团的聚集并诱导连接离子导电通道。由于 TIPN 的动态强制兼容性特性，PBI/DAIm TIPN 膜在高氢氧化物电导率和尺寸稳定性之间实现了良好的平衡性能。特别是，PBI/DAIm TIPN-65/0.5 膜在 80 °C 时表现出高氢氧化物电导率 (96.7 mS cm−1) 和低溶胀比 (4.4%)。它具有较低的总碱吸收量 (2.89%) 和 IEC (0.63 mmol g−1) 官能团，在 60 °C 的 1 M KOH 中表现出优异的化学稳定性，保持 96 小时（94.0% 保留率），并且在水合状态下具有高拉伸强度 (48.2 MPa)。这些观察结果表明 TIPN 结构为 AEM 的电化学机械平衡提供了一种有前景的解决方案。
A new series of thermoplastic interpenetrating polymer network (TIPN) anion exchange membranes (AEMs) based on poly [2,2′- (p-oxydiphenylene) −5, 5′-bibenzimidazole] (OPBI) and poly(1, 2-dimethy-3-allylimidazolium) (PDAIm) (PBI/DAIm TIPN) has been developed. With 1, 2-dimethy-3-allylimidazolium (DAIm) polymerization in presence of OPBI polymer chains, two kinds of uncrosslinked polymer chains, i.e. PDAIm and OPBI interpenetrate with each other to form a physically crosslinking network. Small steric hindrance effect of the DAIm monomer and non-covalent crosslinking interpenetrating polymer chains contribute to better compatibility and chains flexibility in the TIPN compared with the blend and semi-interpenetrating networks, which are evidenced by SEM and SAXS, promote the aggregation of hydrophilic groups and induce connective ionic conductive channels. PBI/DAIm TIPN membranes achieve well-balanced performance between high hydroxide conductivity and dimensional stability because of the dynamically forced compatibility feature of TIPN. Especially, the PBI/DAIm TIPN-65/0.5 membrane exhibits high hydroxide conductivity (96.7 mS cm−1) and low swelling ratio (4.4%) at 80 °C. With low overall alkali uptake (2.89%) and IEC (0.63 mmol g−1) of functional groups, it exhibits excellent chemical stability in 1 M KOH at 60 °C for 96 h (94.0% retention) and high tensile strength (48.2 MPa) in hydrated state. These observations suggest TIPN structure provides a promising solution to the electrochemical-mechanical balance of AEMs.