成功開發主鏈含苯並咪唑之新型二胺單體1-amino-5-(2-(5-aminobenzimidazolyl))-2-methylbenzene (m-CH3/IM/NH2)，並將這新二胺單體、芳香族二胺與六環酸酐Naphthal-enetetracarboxylic dianhydride(NTDA)進行高溫聚縮合形成一系列的PI共聚物，其固有黏度範圍在1.01~1.64 dL/g之間，均可塗佈成具有韌性之薄膜，這些共聚物有好的熱安定性，於氮氣下10%重量損失溫度皆有517℃以上，而氮氣下的裂解溫度也在457℃以上，這些PI共聚物乾膜的抗張強度介於102~196 MPa之間，但是當摻雜磷酸後，薄膜受到磷酸的膨潤，機械強度會有明顯下降。因此藉由甲基側基進行交聯反應，形成交聯PI共聚物，交聯後PI共聚物因受交聯鍵結，使高分子鏈緊密堆積，導致磷酸摻雜量稍微減少，但仍能有足夠高的質子傳導度，並能維持好的機械性質。所合成PI共聚物的質子傳導度在磷酸摻雜率大於280%，幾乎都比m-PBI高，例如C7-m7Bis2F0.3DMB0.7在200℃時之質子傳導度(294% H3PO4 uptake, 76.4 mS/cm)高於m-PBI(280% H3PO4 uptake, 56.8 mS/cm)，非常有潛力應用於高溫型燃料電池的質子傳導膜。

A novel diamine 1-amino-5-(2-(5-aminobenzimidazolyl))-2-methylbenzene (m-CH3/IM/NH2), containing benzimidazole backbone was synthesized. The copolyimides (PIs) were prepared by polycondensation of the diamines and Naphthalene-tetracarboxylic dianhydride(NTDA). They had inherent viscosities in the range of 1.01~1.64 dL/g, and they could form tough and flexible films. The PIs exhibited high thermal stability with 10% decomposition temperature more than 517℃ in nitrogen, and their onset temperature was more than 457℃ in nitrogen. These films exhibited good mechanical properties with tensile stress between 102 and 196 MPa. However, the mechanical properties of PIs significantly decreased when phosphoric acid doping level increased. This situation could be improved via crosslinking reaction of methyl group, cross-linked PIs would form close packing, and it led to decrease of phosphoric acid doping level, but it could still maintain high proton conductivity. The PIs when phosphoric acid doping level exceeded 280%, exhibited higher proton conductivity than m-PBI(280% H3PO4 uptake, 56.8 mS/cm). For example, C7-m7Bis2F0.3DMB0.7 had higher proton conductivity at 200℃(294% H3PO4 uptake, 76.4 mS/cm). Thus, these PIs could be the promising materials alternative to m-PBI membrane for high-temperature fuel cells applications because of their high proton conductivity and good oxidative stability.

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