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化学学报
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化学学报 ›› 2004, Vol. 62 ›› Issue (7): 725-728. 上一篇    下一篇

研究论文

空间质子与电子综合辐照作用下甲基硅橡胶破坏模型

张丽新1,2, 徐洲1, 何世禹2   

  1. 1. 上海交通大学高温材料与高温测试教育部重点实验室, 上海, 200030;
    2. 哈尔滨工业大学空间材料与环境工程实验室, 哈尔滨, 150001
  • 投稿日期:2003-08-19 修回日期:2003-12-22 发布日期:2014-02-18
  • 通讯作者: 张丽新,E-mail:wch2005@sina.com.cn E-mail:wch2005@sina.com.cn
  • 基金资助:
    国家重大基础研究973(No.G199906505)资助项目.

A Model for Destruction of the Methyl Silicone Rubber Net-structure after the Synergistic Radiation of Proton and Electrons

ZHANG Li-Xin1,2, XU Zhou1, HE Shi-Yu2   

  1. 1. Key Laboratory for High Temperature Materials and Tests of Ministry of Education, Shanghai Jiaotong University, Shanghai 200030;
    2. Laboratory of Space Materials and Environment Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001
  • Received:2003-08-19 Revised:2003-12-22 Published:2014-02-18

PDF

650

被引次数

13

利用空间辐照环境模拟设备对甲基硅橡胶进行了质子、电子综合辐照试验.质子、电子的辐照能量均为150 keV,辐照剂量均为1016 cm-2.质谱测试发现,综合辐照过程中有CH3Si(O)CH3气体生成.量子化学计算表明,H+直接进攻硅橡胶高分子链中的氧而导致高分子链断裂的过程要放热655.34 kJ/mol,是唯一的放热反应通道.这一过程不会形成稳定的过渡态和中间体,而是直接形成断键产物.计算分析结果与综合辐照形成的气体产物CH3Si(O)CH3相吻合.

关键词: 甲基硅橡胶, 综合辐照, 质谱, 量子化学计算, 破坏模型

Synergistic radiation effect on methyl silicone rubber of protons and electrons was investigated using a ground-based simulator for space radiation environment. The energy of protons and electrons was chosen as 150 keV, and the fluence 1016 cm-2. The gas product is CH3Si(O)CH3 by mass spectrum after synthesized radiation. The quantum chemistry calculation indicated that the macro-molecule chains in the silicone rubbers could be fractured by a direct attack of H+ to the oxygen in the chains. This process was an only exothermic channel, giving out the heat of 655.34 kJ/mol. No stable transition states and intermediate products were formed, except for the fractured pieces of the chains. The calculation result was in agreement with the gas product CH3Si(O)CH3 formed by synergistic radiation of proton and electrons.

Key words: methyl silicone rubber, synergistic radiation of proton and electron, mass spectrum, quantum chemistry calculation, model for destruction