表面功能化石墨烯/环氧树脂复合涂层及其γ射线辐照损伤效应研究

For the advantage of long cruising distance and high reliability, nuclear powered warships were dispatched to the South China Sea to protect our national sovereignty. To ensure the daily cruise, enough attention must be payed to their poor working conditions of high temperature, high humidity, high salinity and especially the high energy radiation such as gamma ray irradiation. Generally, thermosetting resins such as epoxy and palyamide epoxy were used as protective coatings on the metal materials due to their excellent protection property. However, further processing is still required to improve the anti-radiation damage properties of high polymer resin coatings. In this project, graphene is first modified by several functional groups and then loaded with metal oxides which have better gamma ray shielding and absorbing ability. After dispersed into the epoxy, graphene can synergize with metal oxides to reduce the gamma irradiation damage. The method of dispersing of the modified graphene into epoxy will be study systematically. Meanwhile, the effect on the structure and performance of epoxy resin composite coating after the gamma irradiation will be further researched. We will also explore the gamma ray radiation effect of grapheme/epoxy composite coating under simulated ocean environment, so that the service life of modified graphene/epoxy can be forecasted when serving in the environment of high temperature, humidity, salinity, and high energy radiation.

核动力船舰远赴南海维护主权，续航里程长，设备与仪器可靠性要求高，需要考虑高温、高湿、高盐分以及高能射线如γ射线辐照等对船载设备与仪器的失效损伤。通常采用具有较好防护性能的环氧、聚酰胺环氧等热固性树脂为金属表面涂层。面对新需求，这类涂层的金属防护性能稍显不足。通过对树脂进行复合改性，可以有效提高复合涂层的抗辐照损伤能力。本项目尝试采用特种表面活性剂对石墨烯进行表面功能化修饰，并负载具有较好γ射线损伤能力的金属氧化物，利用石墨烯和金属氧化物的共同作用，提高环氧树脂抗γ射线辐照损伤的能力。研究表面功能化修饰后的石墨烯在环氧树脂溶液中的分散性能，探索石墨烯、金属氧化物等对γ射线辐照后的环氧树脂涂层的结构与性能影响。在模拟海洋环境下，测试复合涂层的氧气渗透和离子扩散速率等性能，研究石墨烯/环氧树脂复合涂层γ射线辐照效应，预测复合涂层在高温、高湿和高盐分及γ射线辐照环境的服役寿命。

核动力船舰远赴南海维护主权，续航里程长，设备与仪器可靠性要求高，需要考虑高温、高湿、高盐分以及高能射线如γ射线辐照等对船载设备与仪器的失效损伤。通常采用具有较好防护性能的环氧、聚酰胺环氧等热固性树脂为金属表面涂层。面对新需求，这类涂层的金属防护性能稍显不足。通过对树脂进行复合改性，可以有效提高复合涂层的抗辐照损伤能力。本项目尝试采用特种表面活性剂对石墨烯进行表面功能化修饰，或负载具有较好γ射线屏蔽能力的金属氧化物，提高环氧树脂抗γ射线辐照损伤的能力。研究结果表明表面功能化修饰后的石墨烯在环氧树脂溶液中具有较好的分散性能；ESR分析表明，复合涂层中的石墨烯可以降低环氧树脂基体在γ射线辐照过程中产生的活性自由基，表明石墨烯可有效吸收辐照过程中的自由基；辐照前后复合涂层的FTIR图谱没有发生明显变化，说明石墨烯可以降低了伽马射线对环氧树脂的结构损伤；电化学Tafel和EIS数据表明，经过适量石墨烯掺杂得到的石墨烯/环氧树脂复合涂层在经过高剂量γ射线辐照后仍可以保持较好的腐蚀防护性能；因此，可以认为石墨烯能够减缓环氧树脂在高能辐照环境中的老化，从而延长其使用寿命，并且可以有效保持复合涂层的腐蚀防护性能。