Synthesis and characterization of polyamide-imides based on the different chain length of amino acids in molten TBAB as a green media

Abstract

As a green, safe and eco-friendly solvent, ionic liquids (ILs) have been widely used in organic syntheses. In this paper, polyamide-imides (PAIs) based on different chain length of amino acids were synthesized by two methods, i.e. in the presence of tetrabutyl ammonium bromide (TBAB) as IL and via conventional polycondensation. The obtained results have been compared. It was confirmed that by the polymerization method in the IL, the PAIs can get higher molecular weight and viscosity and better heat resistance and crystallinity after annealing treatment. All polymers showed higher tensile strength (122–134 MPa) and tensile modulus (2.4–3.0 GPa). Among them, the molecular weight of PAIs based on glycine was characterized by gel permeation chromatography.

Keywords

• amino acids
• conventional polycondensation
• crystallinity
• ionic liquid
• polyamide-imides