Elucidating the relationship between states of water and ion transport properties in hydrated polymers
Elucidating the relationship between states of water and ion transport properties in hydrated polymers
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DOI：
10.1016/j.memsci.2018.12.059
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发表时间：
2019-03
影响因子：
9.5
通讯作者：
Thien N. Tran;Chen Lin;Shabdiki B. Chaurasia;Haiqing Lin
中科院分区：
文献类型：
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作者：
Thien N. Tran;Chen Lin;Shabdiki B. Chaurasia;Haiqing Lin
水合聚合物中的离子传输特性通常与水的量相关，假设所有水的贡献相等。在这里，我们证明了水在聚合物中以三种状态(不可冻结水、中间水和自由水)存在，不同的水状态对聚合物的玻璃化转变温度、离子吸附和扩散等性能产生不同的影响。我们合成了四个系列的聚合物网络，包括中性、两性、阳离子和阴离子交换聚合物。用差示扫描量热法(DSC)测定了水化聚合物中不同状态的水的含量，并研究了它们与聚合物组成的关系。用Gordon-Taylor方程对水化聚合物的玻璃化转变温度与非冰冻水的玻璃化转变温度进行了令人满意的关联。用修正的Yasuda模型对盐溶度与游离水和中间水的组合进行了关联，用修正的Yasuda模型对盐扩散率与总水进行了令人满意的关联。
Ions transport properties in hydrated polymers is usually correlated with the amount of water assuming that all water contributes equally. Herein, we demonstrate that water in polymers exists in three states (non-freezable, intermediate, and free water), and the different states of water exert different impacts on polymer properties including glass transition temperature and ion sorption and diffusion. We synthesized four systematic series of polymer networks including neutral, zwitterionic, cation exchange, and anion exchange polymers. The amounts of water in different states in the hydrated polymers were determined using Differential Scanning Calorimetry (DSC), and their dependence on the polymer composition is investigated. The glass transition temperature of the hydrated polymers is satisfactorily correlated with the non-freezable water using the Gordon-Taylor equation. The salt solubility is correlated with the combined free and intermediate water, and the salt diffusivity is satisfactorily correlated with the total water using the modified Yasuda model.