Influence of antioxidant on the thermal–oxidative degradation behavior and oxidation stability of synthetic ester

Chao, Mianran; Liu, Weimin; Wang, Xiaobo

doi:10.1016/j.tca.2014.07.011

Cited by 32 publications

(21 citation statements)

References 27 publications

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“…The KAS method uses the Arrhenius equation using a differential method. This method does not require knowledge of the exact thermal degradation mechanism [51]. The KAS method is derived from Equation 2, which is integrated from specific conditions (x = 0, T = T 0 ), to get the following expression:…”

Section: Kissinger-akahira-sunose Methods (Kas)mentioning

confidence: 99%

Thermal Degradation Kinetics and FT-IR Analysis on the Pyrolysis of Pinus pseudostrobus, Pinus leiophylla and Pinus montezumae as Forest Waste in Western Mexico

et al. 2020

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For the first time, a study has been carried out on the pyrolysis of wood residues from Pinus pseudostrobus, Pinus leiophylla and Pinus montezumae, from an area in Western México using TGA analysis to determine the main kinetic parameters (Ea and Z) at different heating rates in a N2 atmosphere. The samples were heated from 25 °C to 800 °C with six different heating rates 5–30 °C min−1. The Ea, was calculated using different widely known mathematical models such as Friedman, Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose. The Ea value of 126.58, 123.22 and 112.72 kJ/mol (P. pseudostrobus), 146.15, 143.24 and 132.76 kJ/mol (P. leiophylla) and 148.12, 151.8 and 141.25 kJ/mol (P. montezumae) respectively, was found for each method. A variation in Ea with respect to conversion was observed with the three models used, revealing that pyrolysis of pines progresses through more complex, multi-stage kinetics. FT-IR spectroscopy was conducted to determine the functional groups present in the three species of conifers. This research will allow future decisions to be made, and possibly, to carry out this process in a biomass reactor and therefore the production of H2 for the generation of energy through a fuel cell.

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Section: Kissinger-akahira-sunose Methods (Kas)mentioning

confidence: 99%

Thermal Degradation Kinetics and FT-IR Analysis on the Pyrolysis of Pinus pseudostrobus, Pinus leiophylla and Pinus montezumae as Forest Waste in Western Mexico

et al. 2020

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“…In the other words, lowering of the heating rate increased the spending time of the sample at a certain heating rate. Therefore, the sample gained more energy in comparison to those at the higher heating rates and decomposed faster than others …”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the sample gained more energy in comparison to those at the higher heating rates and decomposed faster than others. 52 The thermo-oxidative degradation of a compound in the presence of an antioxidant could be calculated from a modelfree method. 34,52 In the current study, the effect of a mixture of two antioxidants on the HTPB resin has been investigated with the help of the Kissinger method.…”

Section: Resultsmentioning

confidence: 99%

“…52 The thermo-oxidative degradation of a compound in the presence of an antioxidant could be calculated from a modelfree method. 34,52 In the current study, the effect of a mixture of two antioxidants on the HTPB resin has been investigated with the help of the Kissinger method. In this method, decomposition temperature of the sample at various heating rates is required for modeling.…”

Section: Resultsmentioning

confidence: 99%

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Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

Nazmi

Yarmohammadi

Pedram

et al. 2018

Int J of Chemical Kinetics

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The effect of the mixture of two antioxidants has been evaluated on the thermal‐oxidant degradation of the hydroxyl‐terminated polybutadiene (HTPB) because of its importance in the coatings and adhesives industries. 2,2‐Methylene bis(4‐methyl‐6‐tertiarybutylphenol) or A.O.2246 and 3‐hydroxy pyridine have been considered as antioxidants in this study as a common HTPB antioxidant and an active antioxidant, respectively. The thermal‐oxidant degradation behavior of the HTPB has been investigated in the presence of a mixture of two antioxidants by TGA and DTG tests, and, subsequently, the results of these tests have been interpreted by two model‐free methods, e.g., Kissinger–Akahira–Sunose and Friedman methods. The results revealed that the mixture of two antioxidants affected the activation energy of the thermal‐oxidant degradation reaction of the HTPB. The calculated activation energy value obtained from the Kissinger–Akahira–Sunose method was about 199 ± 1 kJ⋅mol−1. In addition, the Ea value at various conversion rates has also been calculated by using the Friedman method. This method showed that the highest Ea value in the thermal‐oxidant degradation reaction belonged to the initiation step of the reaction (about 299 kJ⋅mol−1). Moreover, the lowest activation energy value was correlated to the second step of the degradation reaction at a conversion rate of 0.6 (about 184 kJ⋅mol−1).

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“…Beyond these considerations on the optimum base oil chemistries, an improvement of the thermo-oxidative performance with aminic and/or phenolic antioxidative additives is the most common way to a achieve higher resistance against oxidation and a longer functional durability of lubricants [14,15]. Lubricant degradation follows the free-radical chain reaction, based on four steps: (1) initiation; (2) propagation; (3) branching; and (4) termination.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Products of Ester-Based Oils with and without Antioxidants Identified by Stable Isotope Labelling and Mass Spectrometry

et al. 2017

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Abstract:As lubricants with a high thermo-oxidative stability such as synthetic esters are gaining more importance in the lubricant market, a detailed knowledge regarding their oxidative degradation behaviour is of high importance. In order to reveal their degradation products and processes, a novel approach combining artificial alteration, isotope labelling based on oxidation with 16 O 2 and 18 O 2 , and mass spectrometry (MS), was applied to a bis(2-ethylhexyl) adipate base oil. The degradation products such as 2-ethylhexanol and its monoesters with short-chain fatty acids pinpointed the C-O ester bond as the site prone to oxidative attack, allowing the collection of information about the oxidation mechanisms. Furthermore, the influence of the antioxidant (AO) 4,4 -methylene-bis(2,6-di-tert-butylphenol) as an additive on the oxidation behaviour and resulting products was studied: blends containing AO showed a remarkably higher resistance against oxidation. However, similar degradation products were obtained after AO depletion and without AO. AO cleavage occurred at the carbon atom that bridges the phenols to give 2,6-di-tert-butyl-p-benzoquinone and 3,5-di-tert-butyl-4-hydroxybenzoic acid. By applying the isotope labelling approach, sites of preferential oxidative cleavage and hence differentiation of the origin of oxygen atoms-either from the atmosphere or from base oil components-can be unambiguously related in oxygen-containing base oils, as well as in blends with additives.

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Influence of antioxidant on the thermal–oxidative degradation behavior and oxidation stability of synthetic ester

Cited by 32 publications

References 27 publications

Thermal Degradation Kinetics and FT-IR Analysis on the Pyrolysis of Pinus pseudostrobus, Pinus leiophylla and Pinus montezumae as Forest Waste in Western Mexico

Thermal Degradation Kinetics and FT-IR Analysis on the Pyrolysis of Pinus pseudostrobus, Pinus leiophylla and Pinus montezumae as Forest Waste in Western Mexico

Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

Oxidation Products of Ester-Based Oils with and without Antioxidants Identified by Stable Isotope Labelling and Mass Spectrometry

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