Suppressing Water Uptake and Increasing Hydroxide Conductivity in Ring-Opened Polynorbornene Ion-Exchange Materials via Backbone Design
Suppressing Water Uptake and Increasing Hydroxide Conductivity in Ring-Opened Polynorbornene Ion-Exchange Materials via Backbone Design
复制标题
DOI：
10.1021/acsapm.2c00297
复制
发表时间：
2022-10
影响因子：
5
通讯作者：
Jamie C. Gaitor;Megan Treichel;T. Kowalewski;Kevin J. T. Noonan
中科院分区：
文献类型：
--
作者：
Jamie C. Gaitor;Megan Treichel;T. Kowalewski;Kevin J. T. Noonan
在这项研究中，我们旨在降低环开聚降冰片烯阴离子交换膜（AEMs）的节段迁移率，作为抑制肿胀的策略。这是通过降冰片烯-蒽环加合物与阳离子四氨基膦降冰片烯单体共聚来实现的，从而获得玻璃化转变温度高于100℃的AEMs。与没有芳烃部分的类似物相比，附着在聚乙烯-1,3-环戊烯链上的蒽基侧基导致磷功能化AEM的吸水率较低。虽然随着时间的推移，这些AEMs会发生化学老化，但固化聚合物骨架的好处是显而易见的。此外，我们注意到磷中心周围的二烷基胺基团的选择对这些磷基AEMs的碱性稳定性起着关键作用。
In this study, we aimed to decrease segmental mobility in ring-opened polynorbornene anion-exchange membranes (AEMs) as a strategy to suppress swelling. This was accomplished by copolymerization of a norbornene-anthracene cycloadduct with cationic tetraaminophosphonium norbornene monomers to afford AEMs with glass transition temperatures above 100 °C. The anthracenyl side groups appended to the poly(vinylene-1,3-cyclopentylene) chain resulted in lower water uptake for the phosphonium-functionalized AEM when compared to an analogue without the arene moiety. Though chemical aging of these AEMs was noted over time, the benefits of rigidifying the polymer backbone were clear. Additionally, we have noted that the choice of dialkylamino groups around the phosphorus center plays a key role in alkaline stability of these phosphonium-based AEMs.