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高离子交换能力的纳米结构和多尺度聚合短侧链 perfluorosulfonic 酸分散

Suyan Wang¹, Jingnan Song¹, Wutong Zhao¹

¹School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai 200240, China.

Journal of colloid and interface science

|June 14, 2024

概括

短侧链完全硫酸 (SSC-PFSA) 离子体在分散中形成棒状聚合物. 它们自组装成网络对于高温质子交换膜 (PEM) 和催化剂层 (CL) 至关重要.

科学领域:

材料科学材料科学材料科学
聚合物化学聚合物化学
纳米技术纳米技术

背景情况:

短侧链完全硫酸 (SSC-PFSA) 离子体对于高温质子交换膜 (PEM) 和催化剂层 (CL) 结合剂至关重要,因为它们具有很高的离子交换能力.
溶液造方法需要了解SSC-PFSA分散特征,以控制PEM和CL形态.
制造高质量的PEM和CL取决于对SSC-PFSA链在分散中的行为有充分的了解.

研究的目的:

为了研究SSC-PFSA在水-乙醇溶剂中的连锁聚合行为.
阐明SSC-PFSA的依赖度的自组装过程.
建立与PEM制造相关的SSC-PFSA分散的结构模型.

主要方法:

动态光散射 (DLS) 用于分析粒子大小和分布.
小角度X射线散射 (SAXS) 探测纳米结构.
低温传输电子显微镜 (Cryo-TEM) 用于直接可视化聚合物形态.

主要成果:

在稀释分散 (2毫克/毫升) 中,SSC-PFSA形成具有疏水性茎和向外延伸的硫酸侧链的单分散棒状聚合物.
度的增加导致棒颗粒半径 (1.471.81 nm) 的增加.
在较高度 (1020毫克/毫升) 时,棒颗粒自组装成端到端的配置,随后形成胀的网络结构.

结论:

已经建立了SSC-PFSA分散的详细结构模型.
观察到的度依赖的自我组装行为对于PEM中纳米结构遗传至关重要.
了解这些聚合行为是优化SSC-PFSA用于高级膜应用的关键.

关键词:

多个尺度的纳米结构.棒状聚合物是一种棒状聚合物.在SSC-PFSA的分散.结构表征技术结构表征技术

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