Block poly(arylene ether sulfone ketone)s containing densely sulfonated linear hydrophilic segments as proton conductive membranes
Block poly(arylene ether sulfone ketone)s containing densely sulfonated linear hydrophilic segments as proton conductive membranes
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DOI：
10.1039/c2py20318a
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发表时间：
2012-07
影响因子：
4.6
通讯作者：
K. Miyatake;D. Hirayama;Byungchan Bae;Masahiro Watanabe
中科院分区：
文献类型：
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作者：
K. Miyatake;D. Hirayama;Byungchan Bae;Masahiro Watanabe
本文报道了以高度磺化的苯醚砜酮单元为亲水嵌段，苯醚联苯砜单元为疏水嵌段的芳香族嵌段共聚物的合成和性能。合成了不同组成(疏水嵌段重复单元数(X)=15、30、60，亲水嵌段重复单元数(Y)=4、8、12)的高相对分子质量嵌段共聚物4(MW=275~362 kDa，Mn=76~144 kDa)。由4的溶液浇铸得到透明可弯曲的膜。由于亲水嵌段的刚性棒状结构，纳米相分离的形态不像传统的磺化芳香嵌段共聚物膜那样明显。高度磺化的亲水嵌段含有含磺酸基团的苯环和吸电子的砜或酮基团，有助于提高4种膜的质子电导率和氧化稳定性。在80%的相对湿度(RH)下，4(X60Y12)膜具有与Nafion相当或更高的电导率(1.18mequiv−1)。
Synthesis and properties of aromatic block copolymers composed of highly sulfonated phenylene ether sulfone ketone units as hydrophilic blocks and phenylene ether biphenyene sulfone units as hydrophobic blocks are reported. High molecular weight block copolymers 4 (Mw = 275–362 kDa and Mn = 76–144 kDa) with different compositions (number of repeat unit in the hydrophobic blocks (X) = 15, 30, or 60, and that of hydrophilic blocks (Y) = 4, 8, or 12) were synthesized. Transparent and bendable membranes were obtained by casting from the solution of 4. Due to the rigid rod-like structure of the hydrophilic blocks, the nanophase-separated morphology was not as distinct as that of the conventional sulfonated aromatic block copolymer membranes. Highly sulfonated hydrophilic blocks, which contained phenylene rings with sulfonic acid groups and electron-withdrawing sulfone or ketone groups, contributed to the high proton conductivity and improved oxidative stability of 4 membranes. The 4 (X60Y12) membrane with low IEC (1.18 mequiv g−1) showed comparable or higher conductivity than that of Nafion at >80% relative humidity (RH).