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Effect of Microstructures of Side-Chain-Type Anion Exchange Membranes on Mono-/Bivalent Anion Permselectivity in Electrodialysis
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-12-17 , DOI: 10.1021/acsapm.0c01133 Chao Wang 1 , Nengxiu Pan 1 , Junbin Liao 1 , Huimin Ruan 1 , Arcadio Sotto 2 , Jiangnan Shen 1
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-12-17 , DOI: 10.1021/acsapm.0c01133 Chao Wang 1 , Nengxiu Pan 1 , Junbin Liao 1 , Huimin Ruan 1 , Arcadio Sotto 2 , Jiangnan Shen 1
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Highly monovalent/bivalent anion permselectivity of anion exchange membranes (AEMs) is of great relevance for a wide range of applications, especially in electrodialysis (ED). In this study, two series of long-side-chain-type AEMs with different microstructures were designed by a facile one-step or two-step Menshutkin reaction. It is found that varying the hydrophobicity of the side chains is a feasible method to easily regulate the permselectivity of AEMs, which was achieved by changing the length of the side chain and charge numbers in long side-chain grafting to the polymer backbone. The CMPSF-N16-1 AEM (ion exchange capacity (IEC) ≈ 1.1 mmol·g–1) exhibits the highest permselectivity (PSO42–Cl– of 60.1), low water uptake (3.5%), and high membrane surface resistance, which are attributed to its hydrophobic polymer backbone and longest alkyl chains. As the IEC of the prepared AEMs augmented or increased the charge numbers in the side chains, PSO42–Cl– obviously decreased, which can be ascribed to the enhanced electrostatic effect and hydrophobicity changes. This work demonstrates that the proposed method to regulate the membrane hydrophobicity is effective to guide the preparation of AEMs with enhanced permselectivity from the microstructure design.
中文翻译：
侧链型阴离子交换膜的微结构对电渗析中单价/二价阴离子渗透选择性的影响
阴离子交换膜（AEM）的高度一价/二价阴离子渗透选择性对广泛的应用具有重要意义，特别是在电渗析（ED）中。在这项研究中，通过简单的一步或两步Menshutkin反应设计了两个系列的具有不同微观结构的长链型AEM。发现改变侧链的疏水性是容易地调节AEM的渗透选择性的可行方法，其通过改变侧链的长度和长侧链接枝到聚合物主链上的电荷数来实现。CMPSF-N16-1 AEM（离子交换容量（IEC）≈1.1 mmol·g –1）表现出最高的选择性（P SO 4 2– Cl –60.1），低吸水率（3.5％）和高膜表面电阻，这归因于其疏水性聚合物主链和最长的烷基链。随着制备的AEM的IEC增加或增加侧链中的电荷数，P SO 4 2-– Cl –明显降低，这归因于增强的静电效应和疏水性变化。这项工作表明，所提出的调节膜疏水性的方法可有效地指导从微观结构设计提高渗透选择性的AEM的制备。
更新日期：2021-01-08
中文翻译：
侧链型阴离子交换膜的微结构对电渗析中单价/二价阴离子渗透选择性的影响
阴离子交换膜（AEM）的高度一价/二价阴离子渗透选择性对广泛的应用具有重要意义，特别是在电渗析（ED）中。在这项研究中，通过简单的一步或两步Menshutkin反应设计了两个系列的具有不同微观结构的长链型AEM。发现改变侧链的疏水性是容易地调节AEM的渗透选择性的可行方法，其通过改变侧链的长度和长侧链接枝到聚合物主链上的电荷数来实现。CMPSF-N16-1 AEM（离子交换容量（IEC）≈1.1 mmol·g –1）表现出最高的选择性（P SO 4 2– Cl –60.1），低吸水率（3.5％）和高膜表面电阻，这归因于其疏水性聚合物主链和最长的烷基链。随着制备的AEM的IEC增加或增加侧链中的电荷数，P SO 4 2-– Cl –明显降低，这归因于增强的静电效应和疏水性变化。这项工作表明，所提出的调节膜疏水性的方法可有效地指导从微观结构设计提高渗透选择性的AEM的制备。
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