Chiral nanocomposites based on thermally stable poly(amide–imide) having S-valine groups and α-Fe₂O₃ nanoparticles

Abstract

A novel chiral poly(amide-imide) (PAI) containing triptycene and S-valine moieties was prepared from the polycondensation reaction of N,N′-(pyromellitoyl)-bis-S-valine diacid chloride with bis(4-aminophenoxy)phenyl triptycene. The new PAI/α-Fe 2 O 3 nanocomposites were prepared via ultrasonic irradiation process by dispersing silane coupling agent modified α-Fe 2 O 3 nanoparticles in the polymer matrix. The resulting nanocomposites were characterized by Fourier transform infrared, powder X-ray diffraction, transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The TEM results indicated that the nanoparticles were dispersed homogeneously in PAI matrix on nanoscale. TGA confirmed that the thermal stability of the nanocomposite was improved in the presence of α-Fe 2 O 3 nanoparticles.