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Dose rate effects of gamma irradiation on silicone foam

机译:伽马射线辐照剂量率对有机硅泡沫的影响

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摘要

AbstractThe dose rate effects of gamma irradiation on silicone foam were confirmed by investigating the relationships between the dose rate and the structures-property of the materials. With accumulation of the dose, the elongation at break (Eb) decreases significantly, while the creep ratio slightly decreases and gas yield increases after irradiation in air, especially at lower dose rate. However, the main gas yields, including H2and CH4, from samples irradiated in nitrogen do not increase linearly with reducing the dose rate. Furthermore, ESR spectra show that more radicals are generated at lower dose rate, indicating obvious dose rate effect. It is deduced that the dose rate effect is caused by the competition among the radical generation, reaction, and quenching rates.HighlightsThe dose rate effects of gamma irradiation on silicone foams were first confirmed.Increased free radical concentration and decreased elongation at break were observed with deceasing dose rate.The dose rate effects are less obvious in air than that in nitrogen.
机译: 摘要 通过研究剂量率与材料结构特性之间的关系,可以确定伽马射线对硅酮泡沫的剂量率效应。 。随着剂量的累积,断裂伸长率( E b )明显降低,而蠕变率则略有降低在空气中照射后,气体产量会增加,尤其是在较低剂量率下。但是,主要气体产量包括H 2 和CH 4 。氮不会随着剂量率的降低而线性增加。此外,ESR光谱显示,在较低的剂量率下会产生更多的自由基,表明明显的剂量率效应。推论剂量率效应是由自由基生成,反应和猝灭速率之间的竞争引起的。 突出显示 首先确认了伽马射线辐照对硅酮泡沫的剂量率效应。 随着剂量的减少,自由基浓度增加,断裂伸长率降低 空气中的剂量率效应不如氮气中的明显。

著录项

  • 来源
    《Polymer Degradation and Stability》 |2018年第1期|97-102|共6页
  • 作者单位

    Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics;

    Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics;

    Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics;

    Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics;

    Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics;

    Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Silicone foam; Radiation; Dose rate effect; ESR;

    机译:硅泡沫;辐射;剂量率效应;ESR;

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