本研究成功合成含有苯並咪唑側基的新二胺單體
2, 2-bis(4-(2-(5-aminobenzimidazoly))phenyl)propane (Bis/IM/NH2)，並與其他芳香族二胺及六環酸酐1,4,5,8-Naphthalenetetracarboxylic dianhydride (NTDA)進行聚縮合反應合成聚醯亞胺(PI)共聚物，其固有黏度範圍在0.75~1.59 dL/g，均可塗佈成具韌性薄膜，這些共聚物均有好的熱安定性，於氮氣下10 %裂解溫度皆超過450 ℃以上。本研究所合成PI共聚物的磷酸摻雜量均低於m-PBI，但質子傳導度幾乎都比m-PBI高，這結果顯示本研究所合成含醚基及異丙叉基團為主鏈，並含有苯並咪唑側基之聚醯亞胺共聚物有利於質子通道形成，尤其是PF系列，因為三氟甲基的疏水性更有利於離子通道形成，在三個系列中有最高的質子傳導度，例如Bis7PF2.7DMB0.3在200℃時之質子傳導度(204% H3PO4 uptake , 84.2 mS/cm)高於m-PBI (280% H3PO4 uptake, 56.8 mS/cm)，很有潛力應用於高溫型燃料電池的質子交換膜。

A novel diamine, 2,2-bis(4-(2-(5-aminobenzimidazoly))phenyl)prop-
ane(Bis/IM/NH2), containing a benzimidazole pendant groups and flexible ether linkage was synthesized successfully. The polyimides were synthesized by condensation polymerization from 2,2-bis(4-(2-(5-amino-
benzimidazoly))phenyl)propane(Bis/IM/NH2) and 1,4,5,8-Naphthalene-
tetracarboxylic dianhydride(NTDA). They had inherent viscosities of 0.75~1.59 dL/g. All polyimides formed tough and transparent films. The PIs exhibited high thermal stability with 10 % decomposition temperature more than 450 oC in nitrogen. The proton conductivity of phosphoric acid doped PI was dependent on doping PA level and temperature. These PIs with relatively low acid doping level have higher proton conductivity than m-BPI. For example, Bis7PF2.7DMB0.3 had the highest proton conductivity at 200 oC (204 % H3PO4 uptake, 84.2 mS/cm) among those polyimides.

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