ESR study of free radicals in UHMW-PE fiber irradiated by gamma rays
文献类型：期刊论文
| 作者 | Zhao, YN ; Wang, MH ; Tang, ZF ; Wu, GZ |
| 刊名 | RADIATION PHYSICS AND CHEMISTRY
 |
| 出版日期 | 2010 |
| 卷号 | 79期号:4页码:5 |
| 关键词 | UHMW-PE Fiber ESR Irradiation Radical |
| ISSN号 | 0969-806X |
| 通讯作者 | Wu, GZ (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, POB 800-204, Shanghai 201800, Peoples R China |
| 英文摘要 | ESR spectra of the trapped radicals in an ultra-high molecular weight polyethylene (UHMW-PE) fiber irradiated by gamma rays showed well-resolved hyperfine splitting at room temperature since the c-axis of the crystallites is aligned with the fiber direction and the radicals are trapped in crystailites. The alkyl radical (-CH(2)-(center dot)CH-CH(2)-) Was the major product after irradiation in vacuum and in air at room temperature. Some of the alkyl radicals converted to allyl radicals (-CH(2)-(center dot)CH-CH=CH-) and polyenyl radicals (-CH(2)-(center dot)CH-(CH=CH)(n)-CH(2)-) during storage in vacuum. Upon storage in air atmosphere, the alkyl radicals decayed by reaction with oxygen. of particular interest is the very slow decay rate of the alkyl radical trapped in UHMW-PE fiber, the half-life is 26 days in vacuum, and 13 days in air at room temperature, which is about 1/30 and 1/100 of that reported for high density polyethylene (HDPE), respectively. The extremely long lifetime of the alkyl radical is supposed to be caused by the large size of crystallites in UHMW-PE fiber. The rate of radical decay was accelerated by annealing at elevated temperature. (C) 2009 Elsevier Ltd. All rights reserved. |
| 学科主题 | Chemistry; Nuclear Science & Technology; Physics |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000275388200007 |
| 公开日期 | 2012-04-11 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/6912]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2004-2010年 |
| 推荐引用方式 GB/T 7714 | Zhao, YN,Wang, MH,Tang, ZF,et al. ESR study of free radicals in UHMW-PE fiber irradiated by gamma rays[J]. RADIATION PHYSICS AND CHEMISTRY,2010,79(4):5. |
| APA | Zhao, YN,Wang, MH,Tang, ZF,&Wu, GZ.(2010).ESR study of free radicals in UHMW-PE fiber irradiated by gamma rays.RADIATION PHYSICS AND CHEMISTRY,79(4),5. |
| MLA | Zhao, YN,et al."ESR study of free radicals in UHMW-PE fiber irradiated by gamma rays".RADIATION PHYSICS AND CHEMISTRY 79.4(2010):5. |
入库方式： OAI收割
来源：上海应用物理研究所
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