质子辐照空间级硅橡胶的正电子淹没寿命谱研究
Study on positron annihilation lifetime spectrum of polysilicone rubber after proton radiation
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摘要: 用正电子淹没寿命谱方法（PALS）研究了质子辐照对空间级硅橡胶KH-L-Y微观结构的影响。试验结果表明，PALS谱所揭示的最长寿命成分的t3, I3及自由体积分数Vf随辐照剂量的增加开始明显下降；而当辐照剂量大于1015cm-2后，随剂量的增加平缓上升。辐照剂量小于1015cm-2时，质子辐照使硅橡胶自由体积减小，分子链间堆砌紧密；辐照剂量大于1015cm-2时，质子辐照使硅橡胶自由体积增大。交联密度及DMA测试结果同样表明，质子辐照在剂量较小时硅橡胶的交联密度及玻璃化转变温度增加，辐照以交联效应为主；而剂量较大时辐照降解占优势。Abstract: The positron annihilation lifeti me spectrum(PALS) method was employed to study the effect of proton radiation on microstructure of the space grade KH-L-Y polysilicone rubber. The results show that both t 3, and I3 of the longest lifetime component and the free volume Vf decrease with the increase of the radiation fluence at the beginning and become level off after 1015cm- 2 radiation fluence. The proton radiation causes decrease in both the free volume of polysilicone rubber, and the distance between the molecules when the radiation fluence is less than 1015cm- 2. However, the proton radiation makes the free volume of silicon rubber increase when the radiation fluence is greater than 1015cm- 2. Both the experimental results of the cross-linking density and DMA indicate that the cross-link
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