ESR study of free radicals in polysilazane irradiated by gamma rays
文献类型：期刊论文
| 作者 | Zhou, LL; Zhao, CX; Liu, WH; Li, YN; Li, YB; Shen, RF; Wang, ML; Wu, YL; Wang, MH |
| 刊名 | RADIATION PHYSICS AND CHEMISTRY
 |
| 出版日期 | 2018 |
| 卷号 | 151期号:-页码:108-113 |
| 关键词 | ELECTRON-SPIN-RESONANCE ADVANCED CERAMICS SIC FIBERS POLYCARBOSILANE POLYMER OXIDATION POLYVINYLSILANE DEGRADATION DENSITY |
| ISSN号 | 0969-806X |
| DOI | 10.1016/j.radphyschem.2018.05.032 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Free radicals trapped in polysilazane (PSZ) induced by gamma-ray irradiation in an Ar atmosphere at room temperature and their decay behaviors were investigated via electron spin resonance (ESR). The G value of the whole initial free radicals was calculated to be 1.8 radicals/100 eV. The free radicals trapped in PSZ were rather stable in Ar at room temperature, and their half-life was estimated to be 470 h according to the decay line. However, they decayed rapidly via reactions with oxygen when exposed to air, and their half-life decreased to 4 h. Interestingly, the free radicals could not be eliminated completely even though the temperature was increased up to 200 degrees C in an Ar atmosphere. Combing with ESR parameters calculation using DFT method, we found that Si-centered radicals were the main products of PSZ after irradiation in Ar at room temperature. Additionally, we proposed the probable conversion reactions of these radicals under different post-treatment conditions. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/30939]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 作者单位 | 1.Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China 2.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China 3.Zhejiang Univ, ZJU NHU United R&D Ctr, Dept Chem, Hangzhou 310027, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, LL,Zhao, CX,Liu, WH,et al. ESR study of free radicals in polysilazane irradiated by gamma rays[J]. RADIATION PHYSICS AND CHEMISTRY,2018,151(-):108-113. |
| APA | Zhou, LL.,Zhao, CX.,Liu, WH.,Li, YN.,Li, YB.,...&Wang, MH.(2018).ESR study of free radicals in polysilazane irradiated by gamma rays.RADIATION PHYSICS AND CHEMISTRY,151(-),108-113. |
| MLA | Zhou, LL,et al."ESR study of free radicals in polysilazane irradiated by gamma rays".RADIATION PHYSICS AND CHEMISTRY 151.-(2018):108-113. |
入库方式： OAI收割
来源：上海应用物理研究所
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