Morphology properties of nanostructure poly(Amide-Imide)s based on N-Trimellitylimido-S-amino acids and 5-(2- benzimidazole)-1,3-phenylenediamine under green conditions
This reports a successful approach to chiral synthetic poly(amide-imide)s by condensation polymerization reaction of chiral diacids N-trimellitylimido-S-valine, N-trimellitylimido-L-leucine, N-trimellitylimido-L-alanine, and N-trimellitylimido-L-isoleucine with 5-(2-benzimidazole)-1,3-phenylenediamine in the presence of tetrabutylammonium bromide as a molten salt ionic liquid (IL). These chiral polymers were characterized with respect to chemical structure and purity using specific rotation experiments, 1H-NMR, FT-IR techniques, X-ray diffraction, field emission scanning electron microscopy, and elemental analysis. Morphology probes illustrated that these new PAIs were noncrystalline and nanostructure polymers with particle size between 28 to 56 nm. The aforementioned polymers show smooth smaller size after sonication.