Synthesis of diazofluorenyl aromatic diacid monomer and its polybenzimidazole polymer
A polybenzimidazole and polymer technology, applied in the direction of organic chemistry, can solve the problems of limited application range, poor solubility, difficult processing, etc., achieve good solubility, facilitate penetration, and improve processability
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[0018] Below in conjunction with accompanying drawing, technical scheme of the present invention is described further:
[0019] The invention provides a diacid monomer containing a Cardo structure: the structural formula of 9,9-bis(4-carboxyphenyl)-4,5-diazofluorene is:
[0020]
[0021] The synthesis method of 9,9-bis(4-carboxyphenyl)-4,5-diazofluorene designed in the present invention is as follows: add 13.3 g (0.07mol) 4,5 -diazofluoren-9-one, 134.3 g (1.4mol) toluene and 137.2 g (1.4mol) concentration of 98% concentrated sulfuric acid, 100 o C was stirred and refluxed for 24 h. After the reaction was completed, the mixed solution was poured into 500 ml deionized water. After stirring for 30 min, a white solid was precipitated in the solution, filtered, washed with water, and washed for 60 o C obtained the crude product after vacuum drying, and the crude product was recrystallized with ethanol to obtain white needle-like crystals.
[0022] Add 5 g of white needle-like ...
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