研究了60Coγ辐照对无卤阻燃EPDM-PVMQ共混橡胶电缆绝缘材料性能的影响。采用的辐照剂量率为171.7Gy/min和283Gy/min,累积总剂量500kGy,并采用国标方法测定了辐照前后材料的力学性能、电绝缘性能和阻燃性能。结果表明,PVMQ配合量小于10phr时,拉伸强度保持率随辐照剂量的增加而迅速降低,大于20phr时,拉伸强度保持率在整个辐照剂量范围内都在90%以上;断裂伸长率保留率随着辐照剂量的增加而降低,剂量率对其没有明显影响;体积电阻率随着辐照剂量的增加而下降;辐照对材料的阻燃性能无明显影响。
The effect of gamma radiation from 60Co on properties of halogen free flame retardant ethylene-propylene diene monomer（EPDM） and its blends with phenyl vinyl methyl silicon rubber（PVMQ） was studied.The dose rates were 171.7 Gy/min and 283Gy/min and the total dose was up to 500 kGy.Mechanical properties,electrical insulation,limiting oxygen index（LOI）,crosslink density of the rubber were carried out to characterize the properties via irradiation.The results show that the elongation at break,the tensile strength and the electrical insulation decrease with LOI unaffected with the increase of radiation dose.The dose rates have no effect on the mechanical properties.
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