Using Mg-al-layered double hydroxide intercalated with chiral dicarboxylic acid for the reinforcement of isoleucine amino acid containing poly(amide-imide)

A series of bionanocomposite (BNC) materials based on isoleucine containing poly(amide-imide) (PAI) and modified MgAl-layered double hydroxide (LDH) were prepared by solution intercalation method for the first time. An optically active PAI was synthesized by direct polycondensation reaction of N,N'-(pyromellitoyl)-bis-isoleucine with 3,5-diamino-N-(thiazol-2-yl)benzamide under green conditions. Organically modified LDH was prepared via ion exchange reaction of MgAl-LDH in a solution of N,N'-(pyromellitoyl)-bis-l-isoleucine in distilled water. X-ray diffraction (XRD) results of modified LDH show an increase in interlayer distance as compared to the unmodified one. The obtained polymer and modified LDH were used to prepare chiral and high-performance hybrid materials. Fourier transform infrared spectroscopy, XRD, field emission scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis (TGA) techniques were used to study the morphology and thermal properties of the obtained hybrid materials. TGA data indicated an increase in thermal stability of the BNCs as compared to the pure polymer. POLYM. COMPOS., 2015. © 2015 Society of Plastics Engineers