Microwave‐Assisted Synthesis and Morphological Characterization of Chiral Poly(amide–imide) Nanostructures in Molten Ionic Liquid Salt

Abstract

Ionic liquids (ILs) are outstanding microwave-absorbing agents due to their high ionic conductivity and polarizability, thus leading to a high heating rate and considerably shortened reaction time. In this study, a series of novel chiral poly(amide-imide) (PAI) nanostructures with hydroxyphenyl pendant units in the side chain were prepared with excellent yields via a simple microwave heating method using molten tetrabutylammonium bromide (TBAB) as a molten IL and triphenyl phosphite as the condensing agent. The polymerization proceeded well in molten TBAB and PAIs were obtained with high yields and moderate inherent viscosities ranging from 0.32 to 0.49 dL/g. The obtained PAIs were characterized using Fourier transform infrared spectroscopy, specific rotation, powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis, elemental analysis, and in some cases by 1 H NMR technique. The FE-SEM micrographs and XRD showed that the synthesized PAIs were nanostructured and amorphous polymers that nanosize particles are in the range of 66-78 nm. The effect of ultrasonic irradiation on the size of polymer particles was also investigated. The transparent and flexible thin films based on PAI nanostructures were obtained by a casting technique, and their properties were studied. C

Efficient functionalization of multi‐walled carbon nanotubes with p‐aminophenol and their application in the fabrication of poly(amide‐imide)‐matrix composites

“…The optical specific rotation of this polymer was (0.05 g in 10 mL of DMF). The polymer was characterized morphologically using FE‐SEM, and chemically using FTIR and 1 H NMR spectroscopy and elemental analysis …”

Ultra-rapid microwave synthesis of Li3−x−yMxN (M = Co, Ni and Cu) nitridometallates

“…typical N-H bands from the NH 2− group were not observed in either the Raman or IR spectra of the as-formed materials). 28,29 The properties of the metal and nitride starting materials are thus important in being able to design a microwave reaction without an external susceptor (such as carbon, typically) and thus minimise possible contamination of products. The presence of naturally abundant hydrogen at implied concentrations approaching 20% could not be detected in our PND measurements either from negative peaks in difference Fourier maps (given its scattering length of b = −3.75 fm) or from an increased background (arising from its large incoherent scattering cross section).…”

Microwave‐Promoted Synthesis of Smart Superporous Hydrogel for the Development of Gastroretentive Drug Delivery System

“…Recent applications of microwave irradiation for the preparation of hydrogels are regarded as a green and facile synthetic procedure . Because of the unique properties such as high reaction rates, great production yields within a shorter period of time, limited side reactions, controlling the size distribution in a narrow range, low‐energy consumption and significantly improved properties of products, microwave‐assisted heating has attracted wide attention, and it has been studied as a convenient method in preparation of hydrogels with exclusive characteristics …”

“…[16][17][18] Recent applications of microwave irradiation for the preparation of hydrogels are regarded as a green and facile synthetic procedure. 19,20 Because of the unique properties such as high reaction rates, great production yields within a shorter period of time, limited side reactions, controlling the size distribution in a narrow range, low-energy consumption and significantly improved properties of products, microwave-assisted heating has attracted wide attention, and it has been studied as a convenient method in preparation of hydrogels with exclusive characteristics. 21 In this article, we reported the facile and green route for fabrication of intelligent SPHs based on dimethylaminoethyl methacrylate (DMAEMA) and acrylamide (AAm) as biocompatible monomers in the presence of magnetic nanoparticles (MNPs) with microwave technique.…”