Proton Conducting Phase‐Separated Multiblock Copolymers with Sulfonated Poly(phenylene sulfone) Blocks for Electrochemical Applications: Preparation, Morphology, Hydration Behavior, and Transport
Proton Conducting Phase‐Separated Multiblock Copolymers with Sulfonated Poly(phenylene sulfone) Blocks for Electrochemical Applications: Preparation, Morphology, Hydration Behavior, and Transport
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DOI：
10.1002/adfm.201200811
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发表时间：
2012-11
影响因子：
19
通讯作者：
G. Titvinidze;K. Kreuer;M. Schuster;C. C. de Araújo-C.;J. Melchior;W. Meyer
中科院分区：
文献类型：
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作者：
G. Titvinidze;K. Kreuer;M. Schuster;C. C. de Araújo-C.;J. Melchior;W. Meyer
制备了一系列由交替的完全磺化的亲水性聚（亚苯基砜）和疏水性聚（亚苯基醚砜）链段组成的多嵌段共聚物，并对其进行了表征。多嵌段共聚物是通过使用专门设计的偶联剂将预先形成的亲水性和疏水性嵌段偶联而形成的。改变两种链段类型的嵌段长度（聚合度）以控制离子交换容量。溶液浇铸膜显示自发的纳米相分离，导致不同的双连续形态与相关长度约15 nm。疏水相赋予膜其有利的粘弹性，即使在高温下在湿和干条件下，而质子传导性发生在亲水相。由于完全磺化的聚（亚苯基砜）的性质在亲水区域内局部保留，因此膜显示出非常高的质子传导性和高水解稳定性。在亲水区域内的非常高的水分散度导致非常低的电渗透水阻力。由于其上级的传输和稳定性，这些多嵌段共聚物具有作为全氟磺酸膜的替代品的巨大潜力，所述全氟磺酸膜在电化学应用中用作隔膜材料，例如聚合物电解质膜（PEM）燃料电池和氧化还原液流电池。
A family of multiblock copolymers consisting of alternating fully sulfonated hydrophilic poly(phenylene sulfone) and hydrophobic poly(phenylene ether sulfone) segments are prepared and characterized. The multiblock copolymers are formed by the coupling of preformed hydrophilic and hydrophobic blocks using a specially designed coupling agent. The block lengths (degree of polymerization) of both segment types were varied in order to control the ion exchange capacity. Solution cast films show spontaneous nanophase separation leading to distinct bicontinuous morphologies with correlation lengths around 15 nm. The hydrophobic phase gives the membranes their advantageous viscoelastic properties even at high temperatures under both wet and dry conditions, while proton conductivity takes place within the hydrophilic phase. Since the properties of fully sulfonated poly (phenylene sulfone)s are locally preserved within the hydrophilic domain, the membranes show very high proton conductivity and high hydrolytic stability. The very high degree of water dispersion within the hydrophilic domains leads to very low electro‐osmotic water drag. Because of their superior transport and stability properties these multiblock copolymers have a great potential for use as a substitute for perfluorosulfonic acid membranes which are used as separator materials in electrochemical applications such as polymer electrolyte membrane (PEM) fuel cells and redox flow batteries.