高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (6): 20220039.doi: 10.7503/cjcu20220039

• 研究论文: 无机化学 • 上一篇    下一篇

改性钆/硼/聚乙烯纳米复合材料的制备及对中子和伽马射线的屏蔽性能

赵盛1,2, 霍志鹏1(), 钟国强1, 张宏1, 胡立群1   

  1. 1.中国科学院合肥物质科学研究院等离子体物理研究所, 合肥 230031
    2.中国科学技术大学, 合肥 230026
  • 收稿日期:2022-01-15 出版日期:2022-06-10 发布日期:2022-03-20
  • 通讯作者: 霍志鹏 E-mail:zhipeng.huo@ipp.ac.cn
  • 基金资助:
    国家自然科学基金(21777165);中国科学院合肥大科学中心“高端用户培育基金”(2020HSC-UE012);聚变堆主机关键系统综合研究设施(CRAFT)项目(2018-000052-73-01-001228);能源研究院(安徽省能源实验室)项目(21KZL401)

Preparation of Modified Gadolinium/Boron/Polyethylene Nanocomposite and Its Radiation Shielding Performance for Neutron and Gamma-ray

ZHAO Sheng1,2, HUO Zhipeng1(), ZHONG Guoqiang1, ZHANG Hong1, HU Liqun1   

  1. 1.Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China
    2.University of Science and Technology of China,Hefei 230026,China
  • Received:2022-01-15 Online:2022-06-10 Published:2022-03-20
  • Contact: HUO Zhipeng E-mail:zhipeng.huo@ipp.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(21777165);the Users with Excellence Program of Hefei Science Center of Chinese Academy of Sciences(2020HSC-UE012);the Comprehensive Research Facility for Fusion Technology Program of China(2018-000052-73-01-001228);the Institute of Energy(Hefei Comprehensive National Science Center), China(21KZL401)

摘要:

采用偶联剂γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)对纳米氧化钆(nanoGd2O3)表面进行包覆改性, 通过热压成型法制备了一种新型的改性纳米氧化钆/碳化硼/高密度聚乙烯(M-nanoGd2O3/B4C/HDPE)复合材料. 傅里叶变换红外光谱(FTIR)、 扫描电子显微镜(SEM)和X射线能谱(EDS)分析结果表明, nanoGd2O3成功被偶联剂改性, 且改性nanoGd2O3在聚乙烯基体内的界面相容性和分散性显著提高. 热重分析(TGA)、 差示扫描量热分析(DSC)和力学拉伸实验表明, 改性nanoGd2O3的引入增强了复合材料的热稳定性, 提高了复合材料的拉伸强度、 杨氏模量和断裂伸长率. 对复合材料的中子和伽马射线屏蔽性能进行了实验测试和蒙特卡罗模拟计算, 研究了nanoGd2O3改性、 材料形状和材料厚度对屏蔽性能的影响. 结果表明, 界面相容性和分散性优良的nanoGd2O3能够有效提高中子及伽马射线屏蔽率. 方形M-nanoGd2O3/B4C/HDPE材料在厚度为11.7 cm时中子屏蔽率达到90%, 在厚度为13.5 cm时伽马射线屏蔽率达到70%.

关键词: 氧化钆, 偶联剂, 表面改性, 聚乙烯, 复合材料, 辐射防护

Abstract:

The surface of nano-sized gadolinium oxide(nanoGd2O3) was modified by the coupling agent, 3-(trimethoxysilyl)propyl methacrylate(KH570), and a new type of nanocomposite(modified-gadolinia/boron carbide/polyethylene, M-nanoGd2O3/B4C/HDPE) was prepared by the hot-pressing method. The results of Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM) and energy dispersive X-ray energy spectroscopy(EDS) show that the nanoGd2O3 was successfully modified by coupling reagent and the surface modification of nanoGd2O3 significantly improved the interfacial compatibility and dispersion in the polyethylene matrix. Thermogravimetric analysis(TGA), differential scanning calorimetry(DSC) analysis and mechanical tensile tests showed that the modification of nanoGd2O3 improved the thermal stability, tensile strength, elongation at break and Young’s modulus of the composites. The neutron and gamma-ray shielding performance of the M-nanoGd2O3/B4C/HDPE was studied by real tests and Monte Carlo simulation. The results showed that the modified nanoGd2O3 with excellent interfacial compatibility and dispersion could enhance the neutron and gamma-ray shielding rate effectively. The square shape M-nanoGd2O3/B4C/HDPE material could achieve a neutron shielding rate of 90% at thickness of 11.7 cm and a gamma-ray shielding rate of 70% at thickness of 13.5 cm.

Key words: Gadolinium oxide, Coupling agent, Surface modification, Polyethylene, Composite, Radiation protection

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