材料期刊网

通过实验设计核电站用三元乙丙橡胶(EPDM)电缆料的配方,然后在过氧化二异丙苯(DCP)引发和电子束辐照下制备得到交联型EPDM,分析不同DCP用量和不同电子束辐照剂量对样品的影响,同时对比两种交联方式下样品的热老化性能和耐辐射性能,并对交联样品的力学性能、热延伸、体积电阻和表面形貌等进行测试表征.结果表明:DCP硫化交联需要高温和一定的时间,而电子束辐射交联则是在室温下进行,交联反应几乎是瞬间完成.热延伸测试结果表明,该配方体系以DCP引发交联更有效.经过热老化实验后,两种交联方式交联的EPDM样品均有残留自由基.DCP交联样品和电子束辐照交联样品在2000 kGy的辐照后,断裂伸长率都降低,极限氧指数(LOI)均升高,体积电阻率均增大.DCP交联样品的表面均很光滑,而电子束辐照交联样品的表面较粗糙.

The formula of ethylene propylene diene monomer (EPDM) cable material for nuclear power plant was designed, and then the crosslinked EPDM samples were prepared via the initiation of dicumyl peroxide (DCP) and irradiation of electron beam. The effects of different content of DCP and different electron beam irradiation dose on the samples were studied, and the thermal ageing resistance and radia-tion resistance of the samples with different crosslinked methods were compared. The mechanical proper-ties, thermal extension, volume resistance, and surface topography of the crosslinked samples were tested and characterized. The results show that DCP vulcanization crosslinking requires high temperature and a period of time, while electron beam irradiation crosslinking reacts at room temperature and completes almost instantly. Thermal extension test results show that DCP is more effective on the initiation of cross-linking for the formula system. After thermal ageing test, there are residual free radicals in the EPDM samples prepared by the two crosslinking methods. For the DCP crosslinked samples and the electron beam irradiated crosslinked samples after 2000 kGy irradiation, their elongation at break decreases, and the limit oxygen index (LOI) increases, and the volume resistivity increases. The surface of DCP cross-linked samples is smooth, while the surface of electron beam irradiation crosslinked samples is rough.