低温电绝缘材料是磁约束聚变堆大型超导磁体中关键材料。为保证聚变堆中超导磁体的安全可靠运行，绝缘材料除了需要满足特殊环境下的力、电、磁性能外，低温导热性能也是不容忽视和亟待解决的。为此，本项目拟采用氧化石墨烯对玻璃纤维增强氰酸酯/环氧树脂基复合材料进行掺杂改性，研究氧化石墨烯的分布及界面对纳米复合材料低温介电特性、力学性能及导热特性的影响规律，建立新型低温绝缘材料“工艺-微结构-材料性能”之间的关联，指导材料优化设计，发挥氧化石墨烯的优异性能，制备出在低温下具备高强高韧高导热率的电绝缘材料，为新型绝缘材料在大型超导磁体中应用奠定基础。

Cryogenic insulating materials play important role in large-scale magnetic confinement nuclear fusion superconducting magnet. To ensure stable operation of superconducting magnet, insulating materials should meet the exceptional requirements in terms of mechanical, electrical and magnetic properties. Meanwhile, cryogenic thermal conductive properties cannot be ignored and should also be taken into consideration. Therefore, graphene oxide (GO) will be adopted to modified glass fiber/cyanate ester/epoxy composites in this project. Effects of the dispersion and interfacial bonding of GO in composites on cryogenic properties in terms of dielectric, mechanical and thermal conductive properties will be investigated. The relationship between “process-microstructure-property” of novel cryogenic insulating materials will be established to guide the material design so that Electrical insulating materials which exhibit excellent mechanical and thermal properties will be manufactured. The project could establish the basis for the novel insulating materials application in large scale superconducting magnet.