Gamma radiation effects on polydimethylsiloxane in hydrogen peroxide solution

Ke CAO; Yinyong AO; Jian CHEN; Jing PENG; Wei HUANG; Jiuqiang LI; Maolin ZHAI

doi:10.11889/j.1000-3436.2017.rrj.35.040302

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Gamma radiation effects on polydimethylsiloxane in hydrogen peroxide solution

RADIATION CHEMISTRY | 更新时间：2021-12-10

- Gamma radiation effects on polydimethylsiloxane in hydrogen peroxide solution
- Journal of Radiation Research and Radiation Processing Vol. 35, Issue 4, (2017)
- 作者机构：
  
  1.北京大学化学与分子工程学院放射化学与辐射化学重点学科实验室教育部高分子化学与物理重点实验室北京分子科学国家实验室北京 100871
  2.中国工程物理研究院核物理与化学研究所绵阳 621900
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(11575009)
- DOI：10.11889/j.1000-3436.2017.rrj.35.040302
  CLC：
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Ke CAO, Yinyong AO, Jian CHEN, et al. Gamma radiation effects on polydimethylsiloxane in hydrogen peroxide solution. [J]. Journal of Radiation Research and Radiation Processing 35(4):040302-5(2017)
DOI：

Ke CAO, Yinyong AO, Jian CHEN, et al. Gamma radiation effects on polydimethylsiloxane in hydrogen peroxide solution. [J]. Journal of Radiation Research and Radiation Processing 35(4):040302-5(2017) DOI： 10.11889/j.1000-3436.2017.rrj.35.040302.

摘要

研究了6%过氧化氢（H,2,O,2,）溶液中的聚二甲基硅氧烷（Polydimethylsiloxane, PDMS）橡胶材料的g辐射效应。首先利用拉伸实验测试了辐照前后PDMS橡胶材料力学性能的变化，然后利用甲苯平衡溶胀法，差示扫描量热分析和傅里叶变换衰减全反射红外光谱分析（Attenuated total reflection-Fourier transform infrared, ATR-FTIR）法对其辐照前后的化学结构变化进行了表征。结果表明，在H,2,O,2,溶液中辐照的PDMS仍发生以辐射交联为主的反应，且在相同的吸收剂量下，相较于空气中辐照的PDMS，在H,2,O,2,溶液中辐照的PDMS的断裂伸长率较高，弹性模量较小，交联密度较低。这可能是由于H,2,O,2,溶液在辐照过程中产生的氧化性活性物质能够捕获PDMS辐照生成的大分子活性自由基，从而降低了PDMS发生交联反应的概率。ATR-FTIR结果则进一步表明，随着吸收剂量的增加，PDMS表面出现一定程度的氧化，而相较于空气中辐照的样品，在H,2,O,2,溶液中辐照的样品表面氧化程度并未明显增强。

Abstract

The effect of γ-radiation (,60,Co γ-ray source) on polydimethylsiloxane (PDMS) rubber soaked in 6% hydrogen peroxide solution was investigated at room temperature. The mechanical properties of the virgin and irradiated PDMS were compared in terms of their tensile strength and the variations in their chemical structure. These properties were analyzed by differential scanning calorimetry (DSC), attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy, and solvent swelling experiments. It was found that when PDMS was irradiated in 6% H,2,O,2, solution, cross-linking reactions were predominant. Compared with the samples irradiated in air, PDMS irradiated in 6% H,2,O,2, solution had a higher elongation at break and a lower elastic modulus, which suggested a lower cross-linking density. This may be attributed to the hydroxyl radicals generated from H,2,O,2, during irradiation process, which capture the free radicals generated from PDMS and reduce the probability of the cross-linking reaction. The ATR-FTIR results showed that slight oxidation reactions occurred upon irradiation and the degree of surface oxidation of PDMS irradiated in 6% H,2,O,2, does not significantly enhanced compared with the samples irradiated in air.

关键词

聚二甲基硅氧烷伽玛辐射效应过氧化氢溶液

Keywords

Polydimethylsiloxaneγ-radiation effectsHydrogen peroxide solution

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