本論文研究利用4-fluorobenzoic acid及3, 3’-diaminobenzidine合成出含有苯咪唑(benzimidazole)之二氟單體，並進一步將此單體與resorcinol利用芳香族親核性取代聚合反應合成出含有醚基之聚苯咪唑(Polybenzimidazole，PBI)，此PBI可溶於一般有機溶劑中，在摻雜磷酸之後於高溫下可以獲得不錯的導電度。此外，再利用3,5-difluoroaniline與前兩種單體合成出含胺基的PBI之共聚物。將含胺基PBI之共聚物與silica前驅物tetraethyl orthosilicate(TEOS)混摻，其中並添加bonding agent，經由溶膠-凝膠法(sol-gel)製備PBI/silica奈米複合材薄膜。Bonding agent的添加可強化有機高分子與無機物之間的交互作用力。由穿透式電子顯微鏡(TEM)分析可看出奈米silica粒子均勻分散在高分子基材中。此PBI/silica奈米複合材料的熱性質、機械性質與氧化穩定性皆能藉由奈米silica的添加而改善。摻雜磷酸後的PBI/silica奈米複合材薄膜其導電率略低於酸化後的純PBI薄膜。

In this study, a benzimidazole-contaning monomer was synthesized from 4-fluorobenzoic acid and 3, 3’-diaminobenzidine.And then, A ether- containing polybenzimidazole(PBI) was synthesized from the monomer and resorcinol via aromatic nucleophilic substitution polymerization. The ether-containing PBI is organosoluble, and have good conductivity at high temperature after doping acid. Furthermore, An amino-containing PBI copolymer was synthesized by the reaction of 3,5-difluoroaniline, resorcinol and the benzimidazole-contaning monomer. PBI/silica nanocomposite membranes were prepared via sol-gel process from the amino-containing PBI copolymer with tetraethyl orthosilicate (TEOS) precursor and a bonding agent. The introduction of the bonding agent results in the reinforcing interfacial interaction between PBI chains and silica nanoparticles. Transmission electron microscopy(TEM) analyses showed that the silica particles were well dispersed in the PBI matrix on a nanometer scale. The thermal properties, the oxidative stability and the mechanical properties of the PBI films were improved by the addition of silica. The conductivities of the pure acid-doped PBI/silica nanocomposites were slightly lower than the acid-doped pure PBI.

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