Thermal decomposition kinetics and anti-oxidation performance of commercial antioxidants

Chao, Mianran; Liu, Weimin; Wang, Xiaobo

doi:10.1007/s10973-015-4525-0

Cited by 10 publications

(7 citation statements)

References 34 publications

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“…In the process of testing, the heating rate (β) has a linear relationship with the temperature, and it can be written as After k ( T ) and d t calculated from eqs and , respectively, are substituated in eq , the reaction rate of general nonisothermal decomposition can be written as In this article, Flynn–Wall–Ozawa (FWO) and Kissinger methods are selected since they have been successfully applied to deal with solid decomposition − and commercial antioxidants . The main equations are listed in the following paragraphs.…”

Section: Resultsmentioning

confidence: 99%

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DBHP-Functionalized ZnO Nanoparticles with Improved Antioxidant Properties as Lubricant Additives

et al. 2019

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In this article, 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid (DBHP)-functionalized ZnO (DBHP−ZnO) nanoparticles were synthesized by decomposing the organometallic precursor Zn(DBHP) 2 under alkaline conditions. This in situ surface modification method can induce small-sized ZnO nanoparticles (5 nm) and form strong linkage between DBHP and ZnO nanoparticles. DBHP as an organic compound hindered phenol antioxidant that not only improved the dispersion stability of the prepared DBHP−ZnO nanoparticles in the lubrication oil but also scavenged free radicals produced during the oxidation process of oil. Compared with DBHP, the thermal stability of the prepared composite antioxidant was greatly enhanced by introducing inorganic ZnO nanoparticles, which was proved by the results of the thermogravimetric analysis test. A rotary oxygen bomb test, pressurized differential scanning calorimetry, and free-radical-scavenging method all showed that DBHP−ZnO nanoparticles had better antioxidant properties than DBHP under high temperature in the base oil of di-iso-octylsebacate (DIOS). The activation energy of the oxidation process was used to analyze this result by the model-free methods, including the Flynn−Wall−Ozawa method and the Kissinger equation. The calculated results showed that DIOS containing DBHP−ZnO nanoparticles have the lowest reaction constant and the longest half-life period compared to those of individual DBHP and ZnO nanoparticles, which is attributed to the combined action of the organic−inorganic composites. Besides, DBHP−ZnO nanoparticles as the additive are able to improve the antiwear ability of DIOS to some extent. Therefore, the as-prepared DBHP−ZnO nanoparticles with desired dispersibility as well as better thermal stability and antioxidant ability than DBHP in the DIOS base oil could be a potential high-performance nanocomposite additive for a synthetic lubricant base oil like DIOS.

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Section: Resultsmentioning

confidence: 99%

“…In this article, Flynn−Wall−Ozawa (FWO) and Kissinger methods are selected since they have been successfully applied to deal with solid decomposition 52−54 and commercial antioxidants. 55 The main equations are listed in the following paragraphs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

DBHP-Functionalized ZnO Nanoparticles with Improved Antioxidant Properties as Lubricant Additives

et al. 2019

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“…As a result of oxidative degradation, undesirable products such as acids, aldehydes, esters, ketones, peroxides and alcohols are formed which increases the acidity and viscosity of the oils and contributes to the formation of sludge and deposits. Ultimately these harm the performance, life expectancy and the operating costs of the oils (Duong et al , 2018; Somayaji and Aswath, 2009; Chao et al , 2015; Rabelo Neto et al , 2004). To avoid these problems and satisfy the quality standards, these oils are expected to possess good oxidation stability (Yao, 1997; Duong et al , 2018; Chao et al , 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Ultimately these harm the performance, life expectancy and the operating costs of the oils (Duong et al , 2018; Somayaji and Aswath, 2009; Chao et al , 2015; Rabelo Neto et al , 2004). To avoid these problems and satisfy the quality standards, these oils are expected to possess good oxidation stability (Yao, 1997; Duong et al , 2018; Chao et al , 2015).…”

Section: Introductionmentioning

confidence: 99%

Performance of commercial antioxidants in white mineral oils

Uyar

Meydan

2023

ILT

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Purpose The aim of this paper is to study the effects of commercially available antioxidants on the oxidation stability of white mineral oils (paraffin oil). Design/methodology/approach Twelve commercially available antioxidants (Chimassorb 81, Tinuvin 326, Tinuvin 765, Tinuvin 571, Irganox L57, Irganox L109, Irganox L101, Irganox L115, Irganox L06, Irgafos 168, Naugard 445, BHT) were added to pharmaceutical and technical grade white mineral oils at 0.1%, 0.2%, 0.3%, 0.6% and 0.8% (w/w) concentrations. Light, heat and oxygen were applied to induce and accelerate oxidation. Total acid number, viscosity and 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity of the oils were measured to evaluate the performance of the antioxidant additives. Findings Results showed that combined heat and oxygen treatment was the most effective of the three conditions tested to cause oxidation. Based on the data, the best antioxidant additives to be used in white oils are decided to be Irganox L06 and Irganox L101. It was also found that the grade of oils (technical or pharma) did not create a significant difference in the results obtained. Originality/value To the best of the authors’ knowledge, this is the first study that reports effects of antioxidant addition on the oxidative properties of white mineral oils. This study advances knowledge of the behavior of white mineral oils under real atmosphere and provides comprehensive data on how the antioxidants affect the light, thermal, oxidative degradation of white mineral oils. The data presented also provide an insight to extend life expectancy of white mineral oils.

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“…Another application of these compounds relates to its in food technologies, which owing to the demand and interesting for new food antioxidants, it becomes very interesting to explore others molecules for the design, synthesis and characterization of new antioxidant agents in order to collaborate in food sciences [23][24][25][26][27][28]. Therefore, the aim of the present study was to describe thermal characterization of the chalcone (1) and it is three analogues with hydroxy group at 2 0 , 3 0 and 4 0 position (2-4), as seen in Fig.…”

Section: Introductionmentioning

confidence: 99%

Thermal study of chalcones

Kobelnik

Ferreira

Regasini

et al. 2018

J Therm Anal Calorim

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Chalcones a-b-unsaturated ketones are found in large plant species. Synthesis of chalcones and its three analogues hydroxy group at 2 0 , 3 0 and 4 0 positions (2-4) was carried out. The studies of thermal behavior were made by thermogravimetry (TG) and differential scanning calorimetry, both under oxygen and nitrogen purge gases. In addition, the kinetic evaluation was carried out under heating rates of 5, 10 and 20°C min-1 with sample mass of 2 mg in open crucibles. The kinetic results obtained by TG analysis showed that the thermal behavior under oxygen shows that the functional hydroxy group substitution affects the thermal behavior of each molecule, with a gradual increase in the thermal decomposition. The activation energy (Ea/kJ mol-1) showed under a nitrogen purge gas that the hydroxy group at 3 0 position (3 0-hy-chalcone compound) has a different kinetic behavior, while the chalcone under oxygen showed a low activation energy when compared with the other hydroxy groups.

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Thermal decomposition kinetics and anti-oxidation performance of commercial antioxidants

Cited by 10 publications

References 34 publications

DBHP-Functionalized ZnO Nanoparticles with Improved Antioxidant Properties as Lubricant Additives

DBHP-Functionalized ZnO Nanoparticles with Improved Antioxidant Properties as Lubricant Additives

Performance of commercial antioxidants in white mineral oils

Thermal study of chalcones

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