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SAXS Investigation on Morphological Change in Lamellar Structures During Propagation Steps of Graft‐Type Polymer Electrolyte Membranes for Fuel Cell Applications
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2019-12-12 , DOI: 10.1002/macp.201900325 Tran Duy Tap 1 , La Ly Nguyen 1, 2, 3 , Yue Zhao 4 , Shin Hasegawa 4 , Shin‐ichi Sawada 4 , Nguyen Quang Hung 5 , Luu Anh Tuyen 2, 6 , Yasunari Maekawa 4
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2019-12-12 , DOI: 10.1002/macp.201900325 Tran Duy Tap 1 , La Ly Nguyen 1, 2, 3 , Yue Zhao 4 , Shin Hasegawa 4 , Shin‐ichi Sawada 4 , Nguyen Quang Hung 5 , Luu Anh Tuyen 2, 6 , Yasunari Maekawa 4
Affiliation
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The changes of the lamellar periods (L1D), thickness of lamellar crystals (Lc), and amorphous layers (La) within the stacked lamellae of poly(styrenesulfonic acid)‐grafted poly(ethylene‐co‐tetrafluoroethylene) polymer electrolyte membranes (ETFE‐PEMs), induced by the preparation and water‐absorbing steps are investigated using the small‐angle X‐ray scattering method. The L1D values of all the samples quickly increase at a grafting degree (GD) range of less than 19% and then level off. The solvent‐induced recrystallization is observed at the early stage of grafting (GD < 10%) and at successive sulfonation and hydration steps. The L1D, La, and Lc of dry and hydrated PEMs show similar values at higher GD ranges (>34%), leading to the conclusion that most water molecules in the PEMs with higher GDs exist at the outside of the lamellar stacks. Accordingly, for the PEMs with low GD (<19%), all the hydrophilic graft‐polymers (ion‐channels) locate in the lamellar stacks and are strongly restricted by lamellar crystalline layers, which suppress the swelling of the PEMs. The unique lamellar structures of ETFE‐PEMs characterized by La and Lc are well connected with the high conductance and mechanical properties of the membranes, and are suitable for fuel cell applications.
中文翻译：
SAXS研究用于燃料电池的接枝型聚合物电解质膜的扩散步骤中层状结构的形态变化
聚（苯乙烯磺酸）接枝的聚（乙烯-共-四氟乙烯）聚合物电解质膜叠层中片层周期（L 1D），层状晶体厚度（L c）和非晶层（L a）的变化使用小角度X射线散射方法研究了由制备和吸水步骤引起的（ETFE-PEM）。所有样品的L 1D值在小于19％的接枝度（GD）范围内迅速增加，然后趋于平稳。在接枝的早期（GD <10％）以及连续的磺化和水合步骤中观察到了溶剂诱导的重结晶。在大号干燥的和水合的PEM的1D，L a和L c在较高的GD范围（> 34％）处显示相似的值，从而得出结论，在较高的GD的PEM中，大多数水分子存在于层状叠层的外部。因此，对于具有低GD（<19％）的PEM，所有亲水性接枝聚合物（离子通道）都位于层状叠层中，并受到层状结晶层的强烈限制，从而抑制了PEM的溶胀。以L a和L c为特征的ETFE-PEM独特的层状结构与膜的高电导率和机械性能紧密相连，适用于燃料电池应用。
更新日期：2019-12-12
中文翻译：
SAXS研究用于燃料电池的接枝型聚合物电解质膜的扩散步骤中层状结构的形态变化
聚（苯乙烯磺酸）接枝的聚（乙烯-共-四氟乙烯）聚合物电解质膜叠层中片层周期（L 1D），层状晶体厚度（L c）和非晶层（L a）的变化使用小角度X射线散射方法研究了由制备和吸水步骤引起的（ETFE-PEM）。所有样品的L 1D值在小于19％的接枝度（GD）范围内迅速增加，然后趋于平稳。在接枝的早期（GD <10％）以及连续的磺化和水合步骤中观察到了溶剂诱导的重结晶。在大号干燥的和水合的PEM的1D，L a和L c在较高的GD范围（> 34％）处显示相似的值，从而得出结论，在较高的GD的PEM中，大多数水分子存在于层状叠层的外部。因此，对于具有低GD（<19％）的PEM，所有亲水性接枝聚合物（离子通道）都位于层状叠层中，并受到层状结晶层的强烈限制，从而抑制了PEM的溶胀。以L a和L c为特征的ETFE-PEM独特的层状结构与膜的高电导率和机械性能紧密相连，适用于燃料电池应用。
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