|
1
|
Zhou J, Chen H, Chen J, Wan D, Zhang H, Wang R, Xie D, Mao C. Mechanisms and Kinetics Studies of Butylated Hydroxytoluene Degradation to Isobutene. J Phys Chem A 2022; 126:3210-3218. [PMID: 35549278 DOI: 10.1021/acs.jpca.2c01961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
2,6-Di-tert-butyl-hydroxytotulene (BHT) is a widely used antioxidant in various fields. In this study, we explored comprehensively the mechanisms and kinetics of BHT degradation to produce isobutene using the density functional theory method. Furthermore, the intrinsic chemical reactivity of BHT was investigated using the electrostatic potential, average local ionization energy, and Fukui function, and the most likely reaction site with OH radical was predicted. Two initiation pathways of BHT with OH radicals were reported. The OH addition pathways at the C2 site of BHT was found more likely to occur than the pathways of H abstracts from the t-butyl group due to the lower energy barrier. Rate constants of two initiation pathways were calculated by transition state theory, and they were promoted by the temperature rise. Mayer bond order and localized molecular orbitals analysis were conducted to reveal the variation of the chemical bonds in the reaction process. The tertiary butyl radical that had been generated in the OH-addition reaction was more likely to generate isobutene with the participation of oxygen. Overall, this research could help to reveal the transformation mechanism of isobutene produced by BHT degradation.
Collapse
Affiliation(s)
- Junwei Zhou
- Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, Department of Polymer Science and Engineering, State Key Laboratory of Coordination Chemistry and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210023, China
| | - Hongrui Chen
- Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, Department of Polymer Science and Engineering, State Key Laboratory of Coordination Chemistry and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210023, China
| | - Jianfa Chen
- Shanghai Space Propulsion Technology Research Institute, Shanghai 201100, China
| | - Daihong Wan
- Shanghai Space Propulsion Technology Research Institute, Shanghai 201100, China
| | - Huikun Zhang
- Shanghai Space Propulsion Technology Research Institute, Shanghai 201100, China
| | - Rong Wang
- Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, Department of Polymer Science and Engineering, State Key Laboratory of Coordination Chemistry and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210023, China
| | - Daiqian Xie
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Chengli Mao
- Shanghai Space Propulsion Technology Research Institute, Shanghai 201100, China
| |
Collapse
|
|
2
|
Durner J, Stojanovic M, Urcan E, Spahl W, Haertel U, Hickel R, Reichl FX. Effect of hydrogen peroxide on the three-dimensional polymer network in composites. Dent Mater 2011; 27:573-80. [DOI: 10.1016/j.dental.2011.02.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2010] [Revised: 10/08/2010] [Accepted: 02/24/2011] [Indexed: 10/18/2022]
|