BIS(3-AMINOPHENYL) METHYL PHOSPHINE OXIDE-BASED (METHYL) NADICIMIDE RESINS

Ten nadicimide/methyl nadicimide end-capped oligomeric resins were pre pared by reacting endo-5-norbornene-2,3-dicarboxylic acid anhydride (m ethyl nadic anhydride), pyromellitic dianhydride (PMDA)/3,3',4,4'-benz ophenone tetracarboxylic acid dianhydride TDA)/2,2-bis(3,4-dicarboxyph enyl)hexafluoropropane dianhydride (6F), and bis(3-aminophenyl) methyl phospine oxide(BAP) in glacial acetic acid/acetone. Structural charac terization of the resins was done by elemental analysis, IR, and H-1-N MR. Multistep decomposition was observed in the TG scan of uncured res ins in a nitrogen atmosphere. Residual weight at 800 degrees C depende d on the structure and ranged between 25 and 51%. Isothermal curing of the resins was done at 300 degrees C for 1 h in an air atmosphere. Th ese cured resins were stable to 350 +/- 30 degrees C and decomposed in a single step above this temperature. The char yield of the resins in creased on curing and was in the range 34-70%. (C) 1997 John Wiley & S ons, Inc.