Preparation, Characterization, and Thermal Degradation Studies of p‐Nitrophenol‐Based Copolymer

Abstract

Polycondensation reaction was employed to synthesize a new copolymer resin (p-NP-4,4′-MDA-F) from p-nitrophenol (p-NP) and 4,4′-methylene dianiline (4,4′-MDA) with formaldehyde (F) in presence of 2 M hydrochloric acid as a catalyst at130±1°C. The resin was characterized by elemental analysis and spectral studies such as UV-visible, FT-IR, and1H-NMR spectra which were used to confine the most probable structure of synthesized copolymer. Thermal degradation pattern and kinetics have been investigated by thermogravimetric analysis. Thermal degradation curve have been studied with minute detail for each degradation step. Friedman, Chang, Sharp-Wentworth, Freeman-Carroll, and Coat-Redfern methods have been implemented in order to compute the kinetic parameters, that is, thermal activation energy (Ea), order of reaction (n), and frequency factor (z).

Nitric oxide functionalized molybdenum(0) pyrazolone Schiff base complexes: thermal and biochemical study

“…In order to decide the number and stage of decomposition of water/hydroxyl or solvent molecules and whether they are inside or outside the coordination sphere TGA provides the ample information. [71][72][73] The evaluation of kinetic and thermodynamic parameters involved in pyrolysis of compounds subjected to the investigation has gained keen interest based on choice of method out of various ways developed so far. In the present work Freeman…”

Failure analysis and durability of preinsulating district heat pipes

“…These samples still are considered to represent, in the case of plastic jacket tubes, the boundary between PUR and steel. From the TGA data, kinetic parameters of thermal decomposition of the PUR were evaluated through the Ozawa‐Flynn‐Wall (OFW), Friedman, and Chang methods . Tests were conducted at 4 different heating rates, 2, 5, 10, and 20 K/min, and different kinetic parameters were obtained, such as the activation energy, reaction order, and the pre‐exponential factor .…”

“…Additionally, the Chang and Friedman methods were used to having a better idea about the decomposition kinetics in the artificially aged samples. The experimental approach is followed by the kinetic equation of solid decomposition: …”

Biodegradation of 4-nitrophenol by a Rhodococcus species and a preliminary insight into its toxicoproteome based on mass spectrometry analysis

“…A xenobiotic nitroaromatic compound, 4-nitrophenol (4-NP) is considered as one of the priority pollutant as per environmental protection agency of United States and a commodity chemical which finds its uses in the manufacturing of pesticides, dyes, petrochemicals and pharmaceuticals (Leilei et al, 2012;Rubio et al, 2012;Kalbende et al, 2013). In addition to this, 4-NP is fairly water soluble, toxic metabolite released into agricultural soils from the microbial degradation of parathion, methyl parathion and other agrochemicals and is adversely correlated with several human health issues (Wei et al, 2010;Arora, 2012).…”