Tailored Synthesis of Nanostructured Polymer Thin Films from Optically Active and Thermally Stable Poly(amide-coimide) s Containing Hydroxyl Pendant Groups in a Green Ionic Solvent

Green and efficient synthesis of new chiral and thermally stable poly(amide-imide) (PAI) nanostructures was attained. Thus, polycondensation reaction of 3,5-diamino-N-(4-hydroxyphenyl)benzamide (4) with different chiral amino acid-based diacids (3a-3d) in the presence of small amount of molten tetrabutylammonium bromide as a molten ionic liquid and triphenyl phosphite were carried out. The obtained PAIs were characterized using FT-IR, specific rotation, X-ray diffraction, field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis, elemental analysis, and ¹H NMR technique. The FE-SEM micrographs showed that the synthesized PAIs are nanostructured polymers which nanosize particles are in the range of 46–66 nm after sonication process.