N n dimethylacetamide

4,4′-Diaminodiphenyl ether (ODA) (98%), 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA), 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA, 98%) were purchased from Energy Chemical (Saan Chemical Technology Co., Ltd., Shanghai, China). 1,3,5-tris(4-(2-trifluoromethyl-4-aminophenoxy)phenyl) benzene (TTFAPOPB) was synthesized by ourselves. Methylene blue trihydrate (BS), TiO₂ (99.8% metals basis, 25 nm), N-methyl-2-pyrrolidone (NMP), and N,N-dimethylacetamide (DMAC) were purchased from Tokyo Chemical Industry (TCI Development Co., Ltd., Shanghai, China).

Glycolic acid (GA), thionyl chloride (SOCl₂), 1,4-butanediol (BD), adipic acid (AA), 2,5-furandicarboxylic acid (FDCA), and N,N-dimethylacetamide (DMAc) were purchased from Tokyo Chemical Industry Co. Potassium hydrogen carbonate and o-dichlorobenzene (ODCB) were purchased from Wako Pure Chemical Industries, Ltd. N,N-Dimethylformamide (DMF), 1,1,2,2-tetrachloroethane (TCE), pyridine, acetone, chloroform, methanol, THF, dimethyl sulfoxide (DMSO), and sulfuric acid (H₂SO₄) were purchased from Kanto Chemical Co., Inc (Tokyo Japan). 1,3-Dibromopropane (DBP), terephthaloyl dichloride (TC), and adipoyl dichloride (AC) were purchased from Tokyo Chemical Industry Co. (Tokyo Japan). 1,4-Dibromobutane, and poly(Glycolic acid) (PGA) were purchased from Sigma-Aldrich, Inc. (St. Louis, MO, USA) Poly(butylene furanoate) (PBF) [17 (link)] and poly(butylene adipate) (PBA) [18 (link)] were prepared according to the literatures. 2,5-Furandicarbonyl dichloride (FC) was prepared from the reaction of FDCA with SOCl₂ according to the literature [19 (link)].

Pyromellitic dianhydride (PMDA) was purchased from Shijiazhuang HOPE Chem. Co. Ltd. (Shijiazhuang, China) and dried at 180 °C in vacuum for 24 h prior to use. APBI was purchased from Changzhou Sunlight Pharmaceutical Co. Ltd. (Changzhou, China) and recrystallized from absolute ethanol and discolored with active charcoal powder before use. N-methyl-2-pyrrolidone (NMP), N,N-dimethylacetamide (DMAc), and other solvents were obtained from Tokyo Chemical Industry Co., Ltd. (Tokyo, Japan) and purified by distillation prior to use.
4,4′-Iminodianiline (NDA) was synthesized in our laboratory [26 (link)] and purified by recrystallization from absolute ethanol under the protection of high-purity nitrogen. Pure NDA diamine was obtained as colorless needles with the purity of 99.5% according to the gas chromatography analysis. It tends to discolor with the exposure of visible light or storage in air, especially staying in good solvents, such as NMP and DMAc. However, it is very stable and can maintain the colorless state for years if it is stored in an inert and dark place.