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首页> 外文期刊>Journal of Applied Polymer Science >Basicity-based screening of aniline derivative for composite proton exchange membranes
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Basicity-based screening of aniline derivative for composite proton exchange membranes

机译：基于碱度的复合质子交换膜苯胺衍生物的筛选

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The aim of this study was to find a suitable aniline derivative to develop composite sulfonated poly(ether ether ketone) (SPEEK) membranes and detail evaluation of their physico- and electrochemical properties. The hypothesis was high basicity of the aniline derivatives could form good composite membranes with better physicochemical and electrochemical properties. To assess the basicity we measured the zeta potentials of the polymers and correlated them with ion-exchange capacities, water uptakes, transport numbers, water-diffusion coefficients, conductivities, and methanol permeabilities. The obtained values of zeta potentials at pH 7 were 6.52, -14.66, -25.17, and -28 for SPEEK/polynaphthalene (PNAPH), SPEEK/polyanisidine (PANIS), SPEEK/polyaniline (PANI), and SPEEK/polyxylindine (PXYL), respectively supports the hypothesis and strongly suggests polyaniline derivative's basicity-dependent properties. Of the four derivatives (PNAPH, PANIS, PANI, and PXYL), the SPEEK/PXYL composite membrane had the lowest methanol permeability of 1 x 10(-4) cm(2)/s and highest proton conductivity of 161 mS/cm. These values are far better than the neat SPEEK and SPEEK/PANI composite. The suitability of SPEEK/PXYL can be explained by the high basicity of the PXYL composite membrane, which leads to the formation of effective Debye spheres, meaning that the ionic complex can interact with surrounding hydronium ions and form hydrophilic channels resulting in high proton conductivity and low methanol permeability. These results suggest that SPEEK/PXYL is a highly suitable membrane for methanol fuel cells or other electrochemical applications. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43978.
机译：这项研究的目的是找到一种合适的苯胺衍生物来开发复合磺化聚醚醚酮（SPEEK）膜，并对其物理和电化学性能进行详细评估。假说是苯胺衍生物的高碱度可以形成具有更好的理化和电化学性质的良好的复合膜。为了评估碱性，我们测量了聚合物的Zeta电位，并将其与离子交换容量，吸水率，迁移率，水扩散系数，电导率和甲醇渗透率关联。对于SPEEK /聚萘二苯（PNAPH），SPEEK /聚苯胺（PANIS），SPEEK /聚苯胺（PANI）和SPEEK /聚己二酸（PXYL），在pH 7下获得的Zeta电位值为6.52，-14.66，-25.17和-28分别支持该假设，并强烈暗示了聚苯胺衍生物的碱性依赖性。在四种衍生物（PNAPH，PANIS，PANI和PXYL）中，SPEEK / PXYL复合膜的甲醇渗透率最低，为1 x 10（-4）cm（2）/ s，质子传导率最高，为161 mS / cm。这些值远远优于纯净的SPEEK和SPEEK / PANI复合材料。 SPEEK / PXYL的适用性可以通过PXYL复合膜的高碱性来解释，这导致形成有效的德拜球，这意味着离子络合物可以与周围的水合氢离子相互作用并形成亲水性通道，从而导致高质子传导性和低甲醇渗透性。这些结果表明，SPEEK / PXYL是非常适合甲醇燃料电池或其他电化学应用的膜。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43978。

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