Hydrogenated pyromellitic anhydride (HPMDA) and hydrogenated 3,3’,4,4’-biphenyltetracarboxylic dianhydride (HBPDA) were purchased from Weihai Newera Kesense New Materials Co. Ltd. (Shandong, China) and dried at 150 °C in vacuo for 24 h prior to use. 2-Chloro-4,4’-diaminobenzanilide (ClDABA) was purchased from Changzhou Sunlight Pharmaceutical Co. Ltd. (Jiangsu, China) and recrystallized from absolute ethanol and discolored with active charcoal powder before use. N-methyl-2-pyrrolidone (NMP), N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), γ-butyrolactone (GBL), and other solvents were obtained from Tokyo Chemical Industry Co., Ltd. (Tokyo, Japan) and purified by distillation prior to use.
2-Methyl-4,4’-diaminobenzanilide (MeDABA) was synthesized in our laboratory according to the literature [32 ] and purified by recrystallization from absolute ethanol. MeDABA was obtained as colorless needles with the purity of 99.5% according to the gas chromatography analysis.
2-Methyl-4,4’-diaminobenzanilide (MeDABA) was synthesized in our laboratory according to the literature [32 ] and purified by recrystallization from absolute ethanol. MeDABA was obtained as colorless needles with the purity of 99.5% according to the gas chromatography analysis.