Role of surface modification of SiO2 with bio-safe citric acid on the morphological and thermal properties of nanocomposites based on N-trimellitylimido-l-methionine diacid and 4,4′-diaminodiphenyl ether: using ultrasound irradiation and ionic liquid

Abstract

In this work, the surface of SiO2 NPs was modified with citric acid (CA) to prevent agglomeration of SiO2 nanoparticles (NP)s in the poly(amide-imide) (PAI) matrix. The PAI was synthesized from polymerization reaction of N-trimellitylimido-l-methionine with 4,4′-diaminodiphenyl ether using molten tetra-n-butylammonium bromide and triphenyl phosphite. PAI–SiO2/CA nanocomposites (PSCN)s were prepared via a fast ultrasonic irradiation process. The PSCNs were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy and thermogravimetric analysis.