本研究規劃透過新穎的交聯方法，合成帶有imidazolium基團之交聯型PS高分子，可以兼具良好的鹼安定性、尺寸安定性與離子導電率，無須權衡取捨。相較於傳統交聯方法，新穎交聯方法以雙三級胺(如bis-imidazole)作為交聯劑，而其與高分子主鏈架橋時同步形成四級胺鹽(如imidazolium)。換而言之，交聯高分子的陽離子基團同時扮演交聯點與陰離子傳導基的角色，如此陰離子傳導基的數量可與交聯程度相等程度增加，在改善薄膜之尺寸安定性與鹼安定性的同時，減緩交聯網絡結構對於離子移動的阻礙。此外，本研究所採用的交聯劑，是為柔軟長鏈段且帶有親水性氧乙烯(EO)基團之Bis-imidazole，透過原子力顯微鏡(AFM)觀察能發現在薄膜成形過程中發展出親水/疏水微觀相分離結構，建構出相連的水通道，將有利於離子傳輸，而有機會進一步提升薄膜之離子導電率。其中PS-BMI-6C2O的薄膜具有良好的導電度，鹼安定性，及機械性質，使交聯型聚苯乙烯-雙咪唑基交聯劑陰離子交換膜具有作為組裝燃料電池時更優良的選擇。

In this work, we used a cross-linking method to synthesize a cross-linked PS polymer with imidazolium groups. Different from traditional anion exchange membranes, the cross-linked polymercationic group serves as the cross-linking point and is in the anion-conducting group at the same time, so the number of anion-conducting groups can be increased to the same degree as the degree of cross-linking, which improves the dimensional and alkali stability as well as the ionic conductivity of the membrane without sacrificing its individual properties. In addition, one of the crosslinking agents used in this research was bis-imidazole with a soft long chain segment adding a hydrophilic ethylene oxide (EO) group. Atomic force microscopy (AFM) revealed that the membrane developed a hydrophilic/hydrophobic microscopic phase separation structure, which constructed a connecting pathway for water to pass through. This led to an opportunity to further improve the ionic conductivity of the membrane. The PS-BMI-6C2O membrane had good ionic conductivity, alkali stability, and mechanical properties, making the cross-linked polystyrene-crosslinked anion exchange membrane an excellent choice for use in fuel cells.

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