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A new diamine containing a bulky diphenylquinoxalin pendant, 3,5-diamino-N-(2,3-diphenylquinoxalin-7-yl)benzamide (DQB), was synthesized in four steps through the nucleophilic aromatic substitution of 3,5-dinitrobenzoylchloride with 2,3-diphenylquinoxalin-6-amine and subsequent catalytic reduction. All intermediates and DQB were fully characterized by FTIR, NMR and elemental analysis. A series of...
A series of copolyimides containing carboxylic acid groups have been prepared from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) and two diamines, 2,4,6-trimethyl-1,3-phenylenediamine and bis(4-amino-3-isopropyl-5-methylphenyl)methane. Carboxylic acid groups were introduced using 3,5-diaminobenzoic acid (DABA) as a comonomer in different proportions in both series of polyimides...
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