A series of UV photocrosslinked and post-sulfonated membranes based on blends of styrene-ethylene-butylene-styrene triblock copolymer (SEBS) and divinylbenzene (DVB) were considered for the preparation of electrolytes for proton exchange membrane fuel cell (PEMFC) applications. Macromolecular dynamics of SEBS and SEBS-DVB membranes below and above the T_g, were analysed using dielectric thermal analysis (DETA). A sub-Tg intramolecular non-cooperative dielectric relaxation and two main relaxations, corresponding to the glass transitions of ethylene-butylene (EB) and styrene (S) blocks, were identified in the dielectric relaxation spectrum. The photocrosslinking and post-sulfonation processes affect to the entire dielectric relaxation spectrum, the apparent activation energy and the fragilities of both styrene (S) and ethylene-butylene (EB) blocks. Understanding the restrictions on the segmental mobility at low and high scale caused by both photocrosslinking and subsequent sulfonation is basic to provide an approach to ionic diffusivities.

A correlation between relaxations processes and the performance of these membranes in H₂/O₂ – PEM single cells allows to estimate the behaviour of these membranes and to reengineer them, depending on the modification of the desired cell performance.

考虑了一系列基于苯乙烯-乙烯-丁烯-苯乙烯三嵌段共聚物（SEBS）和二乙烯基苯（DVB）的共混物的紫外光交联和后磺化膜，用于制备质子交换膜燃料电池（PEMFC）应用的电解质。下面和上面的SEBS和SEBS-DVB膜的大分子动力学Ť_克使用电介质热分析（DETA），进行分析。亚Tg在介电弛豫谱中确定了分子内非合作介电弛豫和两个主要弛豫，分别对应于乙烯-丁烯（EB）和苯乙烯（S）嵌段的玻璃化转变。光交联和后磺化过程会影响整个介电弛豫谱，表观活化能以及苯乙烯（S）和乙烯-丁烯（EB）嵌段的脆性。理解由光交联和随后的磺化作用引起的低和高节段迁移率的限制是提供离子扩散方法的基础。

在H ₂ / O ₂ -PEM单电池中，弛豫过程与这些膜的性能之间的相关性可以根据所需细胞性能的变化来估计这些膜的行为并对其进行重新设计。