Synthesis and characterization of optically active magnetic PAI/Fe 3 O 4 nanocomposites.

This work presents the preparation and characterization of hybrid organic-inorganic optically active poly(amide-imide)/nano-Fe ₃ O ₄ composites with different amount of modified Fe ₃ O ₄ nanoparticles as new nanocomposites by ultrasonic irradiation and characterized by Fourier transform infrared spectra, X-ray diffraction, scanning electron microscopy (SEM), thermogravimetric analysis and vibrating sample magnetometry. The surface of Fe ₃ O ₄ nanoparticles was modified with 3-aminopropyltriethoxyl silane because of the homogeneous distribution of nano-Fe ₃ O ₄ in polymer matrix, which the SEM results confirmed that the Fe ₃ O ₄ nanoparticles were dispersed uniformly in polymer matrix. Furthermore, as compared with pure polymer, thermogravimetric analysis data indicated an improvement of thermal stability of nanocomposites.