Development and characterization of sulfonated poly(ether sulfone) for proton exchange membrane materials
Development and characterization of sulfonated poly(ether sulfone) for proton exchange membrane materials
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DOI：
10.1016/j.ssi.2006.09.013
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发表时间：
2007-03-01
影响因子：
3.2
通讯作者：
Liu, Jianhong
中科院分区：
文献类型：
--
作者：
Dai, Hua;Guan, Rong;Liu, Jianhong
以氯磺酸为磺化剂，浓硫酸为溶剂，对聚醚砜进行磺化，制备了一系列磺化聚醚砜（SPES）。从DMAc溶液中获得了韧性和延展性俱佳的SPES膜。通过H-1 NMR和滴定法计算了磺化度（DS）和离子交换容量（IEC）。原子力显微镜（AFM）相图观察到亲水离子团簇和疏水聚合物主链组成的微相分离结构。当DS达到0.50时，亲水性离子团簇连续形成通道，对应于吸水性突然增加。结合AFM和吸水分析，我们发现SPES系统在DS为0.39左右达到了渗透阈值。DS < 0.39的SPES膜在水中具有良好的尺寸稳定性、机械稳定性和氧化稳定性。在室温下，在水中测量质子电导率范围为10（-4）至10(-1)S/cm。SPES膜的甲醇渗透性低于Nation 112膜。SPES的质子电导率-甲醇渗透率比最高，DS为0.39。结果表明，SPES在质子交换膜燃料电池，特别是直接甲醇燃料电池中具有广阔的应用前景。(c) 2006 Elsevier b.v.版权所有
A series of sulfonated poly(ether sulfone) (SPES) were prepared by sulfonating poly(ether sulfone) with chlorosulfonic as sulfanating agent and concentrated sulfuric acid as solvent. Tough and ductile SPES membranes were obtained from DMAc solution. The degree of sulfonation (DS) and ion exchange capacity (IEC) were calculated via H-1 NMR and titration. Microphase separated structure comprised of hydrophilic ionic clusters and hydrophobic polymer backbone were observed from atomic force microscopy (AFM) phase images. The hydrophilic ionic clusters became continuous to form channels when DS reached 0.50, corresponding to suddenly increase of water uptake. Combining AFM with water uptake analysis, we found SPES system reached a percolation threshold around DS of 0.39. SPES membranes with DS below 0.39 showed good dimensional stability in water, mechanical stability and oxidative stability. Proton conductivities ranged from 10(-4) to 10(-1) S/cm were measured at room temperature in water. SPES membranes exhibited lower methanol permeability than Nation 112. A highest value of the proton conductivity-to-methanol permeability ratio was obtained for SPES with DS of 0.39. The results showed that SPES was promising for possible use in proton exchange membrane fuel cells, especially in direct methanol fuel cells. (c) 2006 Elsevier B.V All rights reserved.