scholarly journals Characteristics and Kinetics of Rosin Pentaerythritol Ester via Oxidation Process under Ultraviolet Irradiation

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2816 ◽  
Author(s):  
Yuanlin Li ◽  
Xiongmin Liu ◽  
Qiang Zhang ◽  
Bo Wang ◽  
Chang Yu ◽  
...  
Keyword(s):  
Light Intensity ◽  
Oxidation Kinetics ◽  
Pseudo First Order Reaction ◽  
Initial Oxidation ◽  
Photo Oxidation ◽  
Average Value ◽  
Pentaerythritol Ester ◽  
Fundamental Information ◽  
The Stability ◽  
Kinetics Of

A self-designed reaction device was used as a promising equipment to investigate the oxidation characteristics and kinetics of rosin pentaerythritol ester (RPE) under UV irradiation. Photo-oxidation kinetics and the initial quantum yield (Φ) of RPE were calculated. The initial oxidation product of the photo-oxidation reaction—peroxide was analyzed by iodimetry. The peroxide concentration is related to the light intensity (I) and the temperature (T), and the increasing T and I would destabilize the RPE by accelerating peroxide forming. Photo-oxidation of RPE follows the pseudo first-order reaction kinetics. The relationship between activation energy and logarithm of light intensity (ln I) is linear, and it is expressed as Ea = −4.937ln I + 45.565. Φ was calculated by the photo-oxidation kinetics, and the average value of Φ was 7.19% in the light intensity range of 200–800 μW cm−2. This research can provide fundamental information for application of RPE, and help obtain a better understanding of the stability of rosin esters.

The different initial oxidation kinetics of Zr(0001) and Zr(101−0) surfaces

2011 ◽  
Vol 110 (2) ◽  
pp. 024904 ◽  
Author(s):  
Georgijs Bakradze ◽  
Lars P. H. Jeurgens ◽  
Eric J. Mittemeijer
Keyword(s):  
Oxidation Kinetics ◽  
Initial Oxidation ◽  
Kinetics Of

Kinetic investigations of Cl atom initiated photo-oxidation reactions of cyclic unsaturated hydrocarbons in the gas phase: an experimental and theoretical study

2017 ◽  
Vol 41 (15) ◽  
pp. 7491-7505 ◽  
Author(s):  
S. Vijayakumar ◽  
C. B. Ramya ◽  
Avinash Kumar ◽  
B. Rajakumar
Keyword(s):  
Gas Phase ◽  
Oxidation Kinetics ◽  
Theoretical Study ◽  
Oxidation Reactions ◽  
Unsaturated Hydrocarbons ◽  
Photo Oxidation ◽  
Kinetic Investigations ◽  
Kinetics Of ◽  
Cl Atom

Cl atom initiated photo oxidation kinetics of cyclohexene and cycloheptene.

Effects of Constituent Phases on Oxidation Kinetics of Al–Mg Alloys Containing a Trace of Ca

2021 ◽  
Vol 21 (3) ◽  
pp. 2067-2070
Author(s):  
Chul-Hong Bae ◽  
Seong-Ho Ha ◽  
Bong-Hwan Kim ◽  
Young-Ok Yoon ◽  
Hyun-Kyu Lim ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Intermetallic Compounds ◽  
Master Alloy ◽  
Oxidation Kinetics ◽  
Thermodynamic Calculation ◽  
Mg Alloys ◽  
Initial Oxidation ◽  
Oxidation Rates ◽  
Kinetics Of ◽  
Al Mg Alloys

In this study, the effects of constituent phases on the oxidation kinetics of an Al-7 mass%Mg alloy containing a trace of Ca were investigated. A Mg+Al2Ca master alloy was used to add Mg and Ca simultaneously. Scheil-Gulliver cooling by thermodynamic calculation showed that the addition of Ca led to the formation of Ca-based intermetallic compounds, such as Al4Ca and Laves C36, after solidification. Based on weight increase indicated by the oxidation test and surface analysis, it was found that the presence of Ca-based phases significantly improved the oxidation resistance and slowed down the oxidation rates. Based on the review of phase diagrams with oxygen partial pressure by thermodynamic calculation, it was thought that in the initial oxidation, MgO and MgAl2O4 were formed on the surfaces of the Al–Mg alloys, leading to further oxidation. The Ca-based intermetallic compounds formed Ca–Mg–Al based oxides, which possibly contributed to the formation of a relatively dense oxide layer.

Initial oxidation kinetics of Si(113)-(3 × 2) investigated using supersonic seeded molecular beams

2020 ◽  
Vol 697 ◽  
pp. 121600
Author(s):  
S. Ohno ◽  
K. Tanaka ◽  
H. Kodama ◽  
M. Tanaka ◽  
A. Yoshigoe ◽  
...  
Keyword(s):  
Oxidation Kinetics ◽  
Molecular Beams ◽  
Initial Oxidation ◽  
Kinetics Of
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