Journal of Polymer Science Part A: Polymer Chemistry, Vol.33, No.14, 2425-2433, 1995
New Poly(Amide-Imide)S Syntheses .15. Preparation and Properties of Poly(Amide-Imide)S Derived from 9,9-bis(4-(4-Aminophenoxy)Phenyl)Fluorene and Various bis(Trimellitimide)S
Fifteen bis(phenoxy)fluorene-containing poly(amide-imide)s III were synthesized by the direct polycondensation of 9,9-bis [4-(4-aminophenoxy)phenyl] fluorene (BAPPF) with various aromatic bis(trimellitimide)s II in N-methyl-2-pyrrolidone (NMP) using triphenyl phosphite and pyridine as condensing agents. Poly(amide-imide)s III having inherent viscosities up to 1.45 dL/g were obtained in quantitative yields. Most of the resulting polymers showed an amorphous nature and were readily soluble in polar solvents such as NMP and N,N-dimethylacetamide. All the soluble poly(amide-imide)s afforded transparent, flexible, and tough films. The glass transition temperatures of these polymers were in the range of 263-315 degrees C and the 10% weight lass temperatures were above 510 degrees C in nitrogen. Some properties of poly(amide-imide)s III were compared with those of the corresponding isomeric poly(amide-imide)s III’ prepared from 9,9-[4-(4-trimellitimidophenoxy)phenyl]fluorene and various aromatic diamines.
Keywords:AROMATIC POLYAMIDE-IMIDES;TRIMELLITIC ANHYDRIDE;4-CHLOROFORMYLPHTHALIC ANHYDRIDE;DIAMINES;2;5-BIS(4-AMINOPHENYL)-3;4-DIPHENYLTHIOPHENE;N;N’-BIS(OMEGA-CARBOXYALKYL)PYROMELLITIMIDES