Study on Radiation Effect of Polytetrofluoroethylene  Sealing Material Irradiated by Electron Beam

HUANG Wei; HAN Jun; XU Yun-shu; FU Yi-bei; HE Jie

doi:10.11804/NuclPhysRev.23.02.180

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Volume 23 Issue 2

Jun. 2006

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Article Navigation > Nuclear Physics Review > 2006 > 23(2): 180-184

HUANG Wei, HAN Jun, XU Yun-shu, FU Yi-bei, HE Jie. Study on Radiation Effect of Polytetrofluoroethylene Sealing Material Irradiated by Electron Beam[J]. Nuclear Physics Review, 2006, 23(2): 180-184. doi: 10.11804/NuclPhysRev.23.02.180

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HUANG Wei, HAN Jun, XU Yun-shu, FU Yi-bei, HE Jie. Study on Radiation Effect of Polytetrofluoroethylene Sealing Material Irradiated by Electron Beam[J]. Nuclear Physics Review, 2006, 23(2): 180-184. doi: 10.11804/NuclPhysRev.23.02.180

Study on Radiation Effect of Polytetrofluoroethylene Sealing Material Irradiated by Electron Beam

doi: 10.11804/NuclPhysRev.23.02.180

1 Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; 2 Sichuan University Key Laboratory of Rad iation Physics and Technology, Ministry of Education, Chengdu 610064, China

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2006-06-20

Abstract

The radiation effect of polytetrafluoroethylene used as a kind of sealing material in the tritium system was studied by using electron beam. The superficial configuration and state were analyzed by SEM and XPS respectively, and the crystal degree and thermal stability were determined by XRD and DSC. At the same time the composition of gas products after radiation ,was measured by GC/MS, and the yield of CO2 with the dose increasing was analyzed. The free radicals produced in the process of radiation were studied by ESR, and the content of free volume of PTFE is analyzed by positron annihilation lifetime spectroscopy. The result is that the crystal structure of the sample irradiated at the dose of 1 × 10^5 Gy is of an obvious damage while the structure of the unirradiated sample is crystal band. The transformation of the sample which has high crystal degree amorphous one. The melting point and thermal ecomposition temperature trend sample＇s thermal stability drops. The radiation decomposition of the sample is is remarkable from crystal state to to decline, which indiccates that the mainly the rupture of C--C bond, and less is the rupture of C--F bond. The Intensity I3 of the third lifetime fails with increasing the absorbed dose, which demonstrates the reduction of free volume cave content. Compared with I3, the rule of τ3 is reverse.
- polytetrafluoroethylene
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Study on Radiation Effect of Polytetrofluoroethylene Sealing Material Irradiated by Electron Beam

doi: 10.11804/NuclPhysRev.23.02.180

1 Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; 2 Sichuan University Key Laboratory of Rad iation Physics and Technology, Ministry of Education, Chengdu 610064, China

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2006-06-20

Key words:

polytetrafluoroethylene

Abstract: The radiation effect of polytetrafluoroethylene used as a kind of sealing material in the tritium system was studied by using electron beam. The superficial configuration and state were analyzed by SEM and XPS respectively, and the crystal degree and thermal stability were determined by XRD and DSC. At the same time the composition of gas products after radiation ,was measured by GC/MS, and the yield of CO2 with the dose increasing was analyzed. The free radicals produced in the process of radiation were studied by ESR, and the content of free volume of PTFE is analyzed by positron annihilation lifetime spectroscopy. The result is that the crystal structure of the sample irradiated at the dose of 1 × 10^5 Gy is of an obvious damage while the structure of the unirradiated sample is crystal band. The transformation of the sample which has high crystal degree amorphous one. The melting point and thermal ecomposition temperature trend sample＇s thermal stability drops. The radiation decomposition of the sample is is remarkable from crystal state to to decline, which indiccates that the mainly the rupture of C--C bond, and less is the rupture of C--F bond. The Intensity I3 of the third lifetime fails with increasing the absorbed dose, which demonstrates the reduction of free volume cave content. Compared with I3, the rule of τ3 is reverse.

Citation: