A new type of aromatic tetraamine containing biphenyl moiety in the side chain was synthesized via a modified Chichibabin’s reaction.3-Nitro-4-acetamidoacetophenone was reacted with 4-phenyl benzaldehyde in the presence of ammonium acetate to obtain 2,6-bis（3’,4’-diaminophenyl）-4-biphenyl pyridine（DPPA）.A series of polypyrrolones（PPys） were prepared using tetraamine and various aromatic dianhydrides via a two-step cyclization procedure.All the PPys show excellent high temperature stabilities with the initial decomposition temperatures of 530-549℃ and residual weight ratio of 49%-80% at 750℃ in nitrogen.The polymers exhibit no apparent glass transition temperatures（T;s）except PPy-1 （T;=327℃）,which is derived from tetraamine DPPA and 2,2-bis[4-（3’,4’-dicarboxyphenoxy）-phenyl]propane dianhydride （BPADA）.In addition,the polymers have acceptable mechanical properties with the tensile strength of 65-94 MPa.The PPy films show excellent hydrolysis-resistance in alkaline aqueous medium and could maintain most of the properties even after boiling in 10% aqueous sodium hydroxide solution for a week.
