【作者】 沈杭； 吴志豪； 黄玮； 陈洪兵； 林铭章；

【Author】 SHEN Hang;WU Zhi-hao;HUANG Wei;CHEN Hong-bing;LIN Ming-zhang;School of Nuclear Science and Technology,University of Science and Technology of China;China Academy Of Engineering Physics,Institute of Nuclear Physics and Chemistry;

【机构】 中国科学技术大学核科学技术学院； 中国工程物理研究院核物理与化学研究所；

【摘要】 航空、航天和核医学等尖端领域应用的高分子材料常面临极端辐射环境,长时辐射对材料的服役可靠性提出了严格的要求,提高此类高分子材料的耐辐射老化性能迫在眉睫。本文利用碳掺杂氮化硼(BCN)的类石墨烯的自由基清除性能,并经硅烷偶联剂KH550改性以提高分散性,制备了耐辐射硅橡胶复合材料。利用万能材料试验机、热重分析仪和平衡溶胀法等手段剖析了材料辐照前后机械、热学、交联度等性能的变化。结果表明,吸收剂量为150 kGy时,纯硅橡胶断裂伸长率下降为未辐照时的40%±2%,而掺杂0.3份BCN-KH550的硅橡胶复合材料则保留初始值的54%±2%。同时,辐照后BCN-KH550硅橡胶复合材料初始分解温度较纯硅橡胶提高了12.8℃。经测试证明,BCN-KH550的加入有效延缓了硅橡胶复合材料的辐射交联效应,对硅橡胶侧链有明显的保护作用。更多还原

【Abstract】 Polymer materials used in cutting-edge fields such as aviation,aerospace and nuclear medicine often face extreme radiation environments.Long-term radiation puts forward strict requirements on the service reliability of materials.It is urgent to improve the radiation aging resistance of such polymer materials.In this paper,the radiation-resistant silicone rubber composites were prepared by using the free radical scavenging properties of carbon-doped boron nitride(BCN)similar to graphene and modified by silane coupling agent KH550 to improve the dispersion.The mechanical, thermal and crosslinking properties of the composite before and after radiation were studied.The results showed that when the absorbed dose was 150 kGy,the elongation at break of pure silicone rubber decreased to 40%±2% of that without irradiation,while the silicone rubber composite doped with 0.3 phr BCN-KH550 retained 54%±2% of the initial value.The initial decomposition temperature of BCN-KH550 silicone rubber composites after irradiation was 12.8℃ higher than that of pure silicone rubber.The test proved that the addition of BCN-KH550 effectively delayed the radiation crosslinking effect of silicone rubber composites and had a significant protective effect on the side chain of silicone rubber.更多还原