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Mandrel degradation model of combined fast and slow processes

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Abstract

In this paper, we report the study of degradation for a kind of ideal mandrel material called poly-α-methylstyrene based on theoretical and experimental methods. First-principles calculations reveal two types of process: depolymerization and hydrogen-transfer-induced chain scission. The energy barrier for the former (0.68–0.82 eV) is smaller than that for most of the latter (1.39–4.23 eV). More importantly, reaction rates suggest that the former is fast whereas the latter is mostly slow, which can result in a difference of 5–31 orders of magnitude at 550 K. Furthermore, a thermogravimetric experiment shows that the activation energy of 2.53 eV for degradation is between those of fast and slow processes, corresponding to the theoretical average value of multiple reaction paths. Thus, a mandrel degradation model combining fast and slow processes is established at the atomic level. Our work provides a direction for research into the key technology of target fabrication in inertial confinement fusion.

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DOI:10.1017/hpl.2020.48

所属栏目:Research Articles

基金项目:This work was supported by the National Natural Science Foundation of China (Nos. 11974136 and 11674123). Z. W. also acknowledges the High-Performance Computing Center of Jilin University.

收稿日期:2020-09-11

录用日期:2020-11-24

网络出版日期:2021-01-12

作者单位    点击查看

Yu Zhu:Institute of Atomic and Molecular Physics, Jilin University, Changchun130012, China
Zheng Liu:Institute of Atomic and Molecular Physics, Jilin University, Changchun130012, China
Famin Yu:Institute of Atomic and Molecular Physics, Jilin University, Changchun130012, China
Qiang Chen:Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang621900, China
Wei Feng:Institute of Atomic and Molecular Physics, Jilin University, Changchun130012, China
Zhanwen Zhang:Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang621900, China
Zhigang Wang:Institute of Atomic and Molecular Physics, Jilin University, Changchun130012, China

联系人作者:Zhanwen Zhang(bjzzw1973@163.com); Zhigang Wang(wangzg@jlu.edu.cn);

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引用该论文

Yu Zhu, Zheng Liu, Famin Yu, Qiang Chen, Wei Feng, Zhanwen Zhang, and Zhigang Wang, "Mandrel degradation model of combined fast and slow processes," High Power Laser Science and Engineering 9(1), e1 (2021)

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