DEVELOPMENT OF HIGHLY SOLUBLE ADDITION-TYPE IMIDE OLIGOMER 'TriA-SI' AND POLYIMIDE COMPOSITE

摘要

Novel highly soluble addition-type imide oligomer "TriA-SI" was synthesized from 3,3',4,4'-biphenyltetracarboxylic dianhydride (s-BPDA), 9,9-bis[4-(4-aminophenoxy)phenyl]-fluorene (BAOFL), and 4-phenylethynylphthalic anhydride (PEPA) to fabricate carbon fiber reinforced plastics (CFRP) by routing imide-solution prepreg. The imide oligomer was soluble in N-methyl-2-pyrrolidone (NMP) of more than 33 wt.%. TriA-SI had good processability when using a hot press. The glass transition temperature (T_g) and 5% weight loss temperature (T_(d5)) of the cured resin were 321℃ and 551℃, respectively. The elongations-at-break of the cured resin film was 10.2 %. An imide-solution prepreg was prepared from the TriA-SI imide oligomer solution and carbon fibers. Because the imide-solution prepreg generates no water during curing process, volatiles of the prepreg (i.e. solvents) were removable easily below 200℃. Polyimide / carbon fiber composite without voids was fabricated from the imide-solution prepreg.