Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO)—A versatile starting polymer for proton conductive membranes (PCMs)
Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO)—A versatile starting polymer for proton conductive membranes (PCMs)
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DOI：
10.1016/j.progpolymsci.2008.07.002
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发表时间：
2008-09
影响因子：
27.1
通讯作者：
T. Xu;Dan Wu;Liang Wu
中科院分区：
文献类型：
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作者：
T. Xu;Dan Wu;Liang Wu
聚合物电解质膜燃料电池（PEMFC）因其高功率密度和环境兼容性而被认为是当前电力供应商的重要替代品；然而，其关键部件之一——质子传导聚合物电解质膜（大部分为Nafion®系列膜）并不利于实际应用。为了以更具成本效益的方式制备膜，可以使用烃类聚合物作为主链；但它要求聚合物具有特定的性能，例如优异的热稳定性和水解稳定性。聚(2,6-二甲基-1,4-苯醚)(PPO)可以列为此类聚合物之一，因为它具有高玻璃化转变温度(Tg=210℃)、高机械强度和优异的水解稳定性。此外，其独特而简单的结构允许在芳基和苄基位置进行各种修饰：（1）PPO苯环上的亲电取代，（2）PPO甲基上的氢的自由基取代，（3）溴甲基化PPO（BPPO）的亲核取代，（4）末端羟基的封端和偶联 PPO链，以及(5)PPO与有机金属化合物的金属化。这些修饰可以调整 PPO 以制备质子传导膜 (PCM)。因此，PPO及其衍生物在PCM制备中的应用将构成本次综述。本综述不是对有关相变材料的文献进行总结，而是旨在通过使用 PPO 作为示例材料来提取相变材料的制备原理。
Polymer electrolyte membrane fuel cells (PEMFCs) have been recognized as the important alternative to current power suppliers due to their high power density and environmental compatibility; however, one of their key components—proton conductive polymer electrolyte membranes (most are Nafion®series membranes) are not favorable for practical application. To prepare a membrane in a more cost-effective manner, hydrocarbon polymers can be used as the backbone; but it requires that the polymer possess specific properties, such as excellent thermal and hydrolytic stability. Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) can be listed as one of such polymers because it has high glass transition temperature (Tg=210°C), high mechanical strength, and excellent hydrolytic stability. In addition, its distinctive but simple structure allows a variety of modifications in both aryl and benzyl positions: (1) electrophilic substitution on the benzene ring of PPO, (2) radical substitution of the hydrogen from the methyl groups of PPO, (3) nucleophilic substitution of the bromomethylated PPO (BPPO), (4) capping and coupling of the terminal hydroxyl groups in PPO chains, and (5) metalation of PPO with organometallic compounds. These modifications can tune PPO for preparation of proton conductive membranes (PCMs). Therefore, the application of PPO and its derivatives to PCM preparation will constitute this review. Instead of a summary on the literature concerning PCMs, this review aims to extract the principles for preparation of PCMs by using PPO as an example material.