Magnetic heat resistant poly(amide–imide) nanocomposite derived from bisphenol A: Synthesis and properties

New magnetic and heat resistant poly(amide–imide) nanocomposite (PAIN) was prepared from Fe 3 O 4 nanoparticles and poly(amide‐imide) (PAI) in a solution of N ‐methyl‐2‐pyrrolidone. New PAI derived from bisphenol A containing aryl sulfone and ether moiety was synthesized from 2,2′‐(4,4′‐(4,4′‐(propane‐2,2‐diyl)bis(4,1‐phenylene))bis(oxy)bis(4,1‐phenylene))bis(1,3‐dioxoisoindoline‐5‐carboxylic acid) 5 as a new diacid and 4,4′‐diaminodiphenyl sulfone by direct polycondensation reaction. Fe 3 O 4 nanoparticles were prepared by coprecipitation method and characterized using Fourier transform infrared, X‐ray diffraction, scanning electron microscopy (SEM), and vibrating samples magnetometer (VSM). The new poly(amide‐imide)/Fe 3 O 4 nanocomposite was characterized using SEM, FTIR, and VSM. The effect of Fe 3 O 4 nanoparticles on the thermal properties of PAI was studied using thermogravimetric analysis and differential scanning calorimeter. POLYM. COMPOS., 34:1682–1689, 2013. © 2013 Society of Plastics Engineers