Synthesis and characterization of novel aromatic-aliphatic poly(amide-imide-imide)s (PAII)

Novel poly(amide-imide-imide)s (PAII) were prepared by polycondensation of a new monomer synthesized from trimellitic anhydride and glutamic acid, fol lowed by reflux condensing with thionyl chloride and several diamines. Poly mers and monomers were characterized by H-1 NMR and FT-IR spectroscopy, ele mental analysis and mass spectrometry, Inherent viscosities of the resultin g polymers were in the range of 17-26 mL g(-1) (M-w 13400-29160, polpdisper sity (M-w/M-n) ca. 1.3-1.7), representing rather low molecular weights. The glass transition temperatures of the polymers were in the range of 210-285 degrees C depending on the structure of diamines, and the thermal stabilit y of the polymers was up to 400 degrees C, comparable with that of polyimid es and poly(amide imide)s. All the polymers synthesized are well soluble in aprotic polar solvents such as dimethylformamide, dimethyl sulfoxide, N-me thyl-2-pyrrolidone and dimethylacetamide. Particularly, polymers containing oxydianiline and 4,4'-diaminodiphenyl sulfone were quite soluble in m-cres ol, pyridine, nitrobenzene and tetrahydrofuran.