Microwave assisted functionalization of carboxylated‐multiwalled carbon nanotubes with 5‐aminoisophthalic acid and its application for the preparation of chiral poly(ester‐imide)/CNT nanocomposites

Abstract

This article presents the results of investigation into surface modification of carboxylated multiwalled carbon nanotubes (MWCNT)s by 5-aminoisophthalic acid under microwave irradiation as a fast, safe, and simple method. The different contents of functionalized MWCNTs (5, 10, 15 wt%) were effectively dispersed in an aromatic polymer through ultrasonic irradiation to prepare MWCNT reinforced polymer nanocomposites (NC)s. The chiral poly(ester-imide) (PEI) was prepared by a direct polycondensation of chiral diacid with 4,4 0thiobis(2-tert-butyl-5-methylphenol). The effect of the presence of MWCNTs on morphological and thermal properties of the NCs was investigated by X-ray diffraction, FT-IR spectroscopy, thermogravimetric analysis (TGA), transmission electron microscopy, and field emission scanning electron microscopy. According to TGA data, the PEI/MWCNT NCs showed a much better thermal stability than pristine polymer. The microstructure study of the NCs indicated the compatibility of functionalized MWCNTs with PEI and uniform distribution of them in the polymer matrices. POLYM. COMPOS., 37:835-843,

Effective methodology for the production of novel nanocomposite films based on poly(vinyl chloride) and zinc oxide nanoparticles modified with green poly(vinyl alcohol)

“…LOI, the minimum concentration of oxygen for combustion of a polymer, was used for characterizing the flammability tendency of materials and calculated based on van Krevelen and Hoftyzer equation. Due to the linear relationship between LOI and char yield, macromolecules with LOI above 21% were classified as self‐ extinguishing polymers (Oxygen concentration in ambient air is 21%) . where CR = char yield.…”

“…For all NCs, LOI were calculated and it could be seen obviously that incorporation of ZnO‐PVA NPs considerably increased LOI values and flame retardancy potential of PVC NCs .…”

Microwave-Assisted Functionalization of Multi-Walled Carbon Nanotubes for Biosensor and Drug Delivery Applications

“…The formed product was placed in polyamideimide, in the presence of dimethylacetamide, for 24 h at 30–40 °C, to yield MWCNTs that had an increased dispersibility and solubility, compared to pristine MWCNTs. It was reported that oxidized MWCNTs placed in 5-aminoisophthalic acid, in the presence of microwave irradiation up to 700 W, for 15 min at 120 °C, formed an amide bond compound ( Figure 6 e) [ 55 ]. The resulting product had a highly stable covalent bond between the carboxylic group of MWCNTs and the free amino group of aminoisophthalic acid and a decreased the aggregation propensity, compared to unmodified MWCNTs.…”