本研究合成一個含苯并咪唑(benzimidazole)巨大側基及具柔軟醚鏈段的不對稱新型二胺2-benzimidazolyl-4,4’-oxydianiline(6)，並將此新型二胺與常見的三種二酸酐以兩步法合成新型聚醯亞胺系列(1Ben系列)。剛硬的benzimidazole側基讓新型聚醯亞胺具有極佳的熱穩定性，其Tg 在277~342 ℃之間，所測得的Td5%介在528~573 ℃， Td10%介在548~590 ℃，在800 ℃之熱殘餘重介在46~66 %，熱膨脹係數(CTE)介於28~35 μm/m℃之間。因其具有benzimidazole側基，故可將此新型聚醯亞胺應用於高溫型質子交換薄膜燃料電池。如此一來，新型聚醯亞胺有機會替代合成不易的PBI。 1Ben系列之聚醯亞胺皆擁有良好的氧化安定性，經192小時的Fenton’s test試驗中皆保持92 %以上的殘留重量百分率。1Ben系列在160 ℃時質子傳導率可達到1.7×10-2~4.3×10-2 S/cm，電池輸出功率密度最高可達到213~566 mW/cm2，開路電壓為0.88~0.92 V， 皆為質子交換燃料電池所可使用範圍。其中1Ben-6FDA能在較低的磷酸摻雜量下，得到最大電池輸出功率密度566 mW/cm2，比市售m-PBI的對照組(423 mW/cm2)高出34 %。

A novel asymmetric diamine, 2-benzimidazolyl-4,4’-oxydianiline(6), containing a bulky benzimidazole side group and flexible ether linkage was synthesized successfully. And a series of novel polyimides (1Ben series) were prepared based on this novel diamine and the three kinds of dianhydrides by two steps method. Due to the rigid benzimidazole group, the novel polyimides exhibited excellent thermal stabilities. The glass transition temperatures (Tg) of the polyimides were between 277~342 ℃. The temperatures of 5 % weight loss (Td5%) were between 528~573 ℃. The temperatures of 10 % weight loss (Td10%) were between 548~590 ℃. The residual weight kept 46~66 % at 800 ℃. The coefficient of thermal expansion (CTE) of the polyimides series were between 28~35 μm/m℃. Because of the benzimidazole side group existent, the novel polyimides series could be applied to high temperature proton exchange membrane fuel cell. So the novel polyimides could be alternated PBIs which were difficult to synthesize. All the novel polyimides had outstanding oxidation stability. After Fenton’s test testing for 192 hours, the novel poyimides series kept above 92 % residual weight. The proton conductivities of the novel polyimides could reach to 1.7×10-2~4.3×10-2 S/cm. The highest power densities were 213~566 mW/cm2. The open circuit voltages were 0.88~0.92 V. So these fuel cell properties could be applied to high temperature proton exchange fuel cell. Especially, although 1Ben-6FDA had lower acid content, the power density of 1Ben-6FDA (566 mW/cm2) could exhibit 34 % higher than commercial m-PBI (423 mW/cm2).

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