Synthesis and Characterization of New Aromatic Poly(amide-imide)s Derived from Bis(3-trimellitimidophenyl) Phenyl Phosphine Oxide and Various Aromatic Diamines A. Banihashemi*, B. Tamami and A. Abdolmaleki Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran (Received 31 August 2003, Accepted 1 March 2004) ����� New aromatic poly(amide-imide)s with high inherent viscosities were prepared by direct polycondensation reaction of diimide-diacid (I) and aromatic diamines using triphenyl phosphite in N-methyl-2-pyrrolidone (NMP)/pyridine solution containing dissolved CaCl2. The bis(3-trimellitimidophenyl) phenyl phosphine oxide (I) was readily obtained by the condensation reaction of bis(3-aminophenyl) phenyl phosphine oxide (BAPPO) with trimellitic anhydride. The resulting poly(amide-imide)s showed high thermostability. Their decomposition temperatures at 10% weight loss in nitrogen atmosphere were above 532 �C and the anaerobic char yield at 800 �C ranged from 56% to 74%. Almost all the poly(amide-imide)s showed high glass transition temperature above 233 �C by differential scanning calorimetry (DSC) measurements. These polymers were readily soluble in various organic solvents and by their casting into transparent, tough and flexible films can be easily achieved. Keywords: Aromatic poly(amide-imide)s, Polycondensation, Characterization, Thermostability | 
