THERMALLY STABLE IMIDE OLIGOMERS FROM ACRIDINE YELLOW

The synthesis and characterization of three new imide oligomers from a cridine yellow, using pyromellitic dianhydride (PMDA), 3,3',4,4'-benzo phenone tetracarboxylic acid dianhydride (BTDA) and 2,2'-bis(3,4-dicar boxyphenyl) hexafluoropropane dianhydride (6FDA), is reported in this paper. Due to the poor reactivity of acridine yellow, a two-step synth esis technique at lower temperature produced little or no product. The one-step, elevated temperature, solution imidization technique was de emed to be more efficient and was used to synthesize polyimides. Optim ized reaction conditions were determined for all these polymers. Intri nsic viscosity values of poly(acridine yellow-co-PMDA) (AYPMDA), AYBTD A and AY6FDA polyimides were 0.11 in N-methyl-2-pyrrolidinone (NMP) an d 0.10 and 0.13 dimethylformamide (DMF), respectively. The newly synth esized imide oligomers were thermally stable up to 400 degrees C in a nitrogen atmosphere. AYBTDA and AY6FDA polyimides were soluble in DMF and dimethyl sulfoxide. AYPMDA polyimide was soluble in NMP. (C) 1997 Elsevier Science Ltd.