Novel optically active poly(amide-thioester-imide)s containing l-α-amino acids and thiadiazol anticorrosion group

Abstract

Here, for the first time, we report the synthesis of a new class of optically active polymers, poly(amide-thioester-imide)s (PATEI)s, containing flexible and anticorrosion linkages.Step growth polymerization of a novel diamine with diacids containing amino acid and trimellitylimide groups in tetrabutylammonium bromide, in the molten state, which acts as a molten ionic salt medium, was carried out. The obtained polymeric materials were of the nanoscale size and were assembled by filamentary particles as shown by field-emission scanning electron microscopy micrographs, which were distributed uniformly and randomly, with an average nanosize diameter of about 40 nm. The polymeric samples were readily soluble in a variety of common organic solvents and formed low-colored and flexible thin films via solution casting. The values of absorption edge wavelength (l 0 ) were determined by ultraviolet-visible spectroscopy, and all of the resulting PATEI films exhibited high-optical transparency. According to x-ray diffraction patterns, all the PATEIs were amorphous. The structure of PATEIs were also characterized by Fourier-transform infrared spectroscopy, Proton-nuclear magnetic resonance, elemental, and thermogravimetric analysis techniques. The effect of ultrasound on the morphology of polymers was also investigated. This study confirmed that the size of polymer particles decreased and there was a change in their morphology.

Functionalization of multiwalled carbon nanotubes with S-valine amino acid and its reinforcement on amino acid-containing poly(amide-imide) bionanocomposites

“…The growing interest during the last two decades in the environmental protection has made both modern academic and industrial groups develop green chemical processes with maximum yield and minimum cost. [37][38][39] As a part of our program, we aimed at the development of synthetic methodologies 40,41 by eliminating flammable, toxic, or carcinogenic organic solvents and employed a molten ionic salt, TBAB, as a green chemical medium for step-growth polymerization. The rapid use of microwave activation as a nonconventional energy source in organic chemistry also helped us in devising the above synthetic route.…”