Asymmetric-based novel poly(ether-imide)s: Preparation, properties, kinetics of thermal decomposition, and study electrochemical oxidation behavior by using nanocomposite paste of polymer and multi-walled carbon nanotube

Abstract

A series of novel fluorescent poly(ether-imide)s (PEIs) bearing ether linkage and diarylimidazole pendant in the backbone was successfully prepared by polycondensation reaction between a new unsymmetrical diamine and commercially available tetracarboxylic acid dianhydrides. The PEIs were characterized by Fourier transform infrared, 1 H-NMR, UV-vis spectroscopy, fluorimetry, scanning electron microscopy and elemental analysis. The PEIs with inherent viscosities in the range of 0.47-0.63 dL g À1 showed excellent solubility in various aprotic solvents such as N-methylpyrrolidone, dimethyl sulfoxide, N,N-dimethylacetamide and N,N-dimethylformamide. Thermal properties of new PEIs were evaluated by differential scanning calorimetric and thermogravimetric analysis in N 2 and air. These polymers showed glass transition temperatures (T g ) in the range of 269-333 C and 10% weight loss temperatures above 400 C in air atmosphere. The data obtained from TGA experiments of these polymers have been applied in different kinetic equations such as Coats-Redfern, Kissinger and Criado methods, to determine the kinetic parameters (E, ÁS, ÁG, ÁH) and mechanism of thermal decomposition. Herein a method based on the adsorptive stripping cyclic voltammetry technique to investigate electrochemical oxidation of these polymers by using multi-walled carbon nano tubes modified glass electrode is also reported.

High-performance polyimides based on pyridine and xanthene pendant groups; synthesis, characterization, photoactivity, thermal, antibacterial, and Cr(VI) ion adsorption properties

“…9 –15 The most general strategies to increase solubility and decrease T g of these polymers are the introduction of heterocyclic rings, 16 –18 flexible linkages, 19,20 or bulky pendant in the side or backbone chains of polymers, 21,22 and changing the symmetrical structure by using—meta or—ortho aromatic rings attachments. 23 The existence of bulky groups such as xanthene on the backbone affects polymer matrix orders, reduces the structural rigidity, and intermolecular hydrogen bonds. These results in increasing the solubility characteristics without affecting thermal and mechanical properties.…”

Synthesis, Characterization and Heavy Metal Ion Adsorption Behavior of Imidazole-Based Novel Polyamides and Polyimides

“…The rigidity based on the aromaticity and polarity of the heteroaromatic rings contributes to the thermal and chemical stability and retention of mechanical properties of the resulting polymer at elevated temperatures [17][18][19]. However, the polarizability resulting from the heteroatoms such as nitrogen atoms in the imidazole ring improves the polymer's solubility in organic solvents [20][21][22][23][24]. Moreover, Imidazoles and more specifically 2,4,5-triarylimidazoles are known as inhibitors, herbicides and fungicides, therapeutic agents and plant growth regulators, [25][26][27][28][29][30] and their optical properties (chemiluminescence and fluorescence) are of particular concern for material scientists.…”