电子束熔融辐照对EVA绝缘性能的影响

Effect of electron beam melting irradiation on insulating properties of EVA

采用电子束熔融辐照的方法对EVA材料进行辐照改性,研究不同辐照剂量对EVA样品凝胶含量、力学性能、体积电阻率、介电性能、击穿特性和分子结构的影响。结果表明:EVA样品的凝胶含量随着辐照剂量的增加先升高后降低,在辐照剂量为100 kGy时,凝胶含量达到了95.7%;辐照会降低EVA样品的断裂伸长率,而拉伸强度随着辐照剂量的增加先升高后降低;辐照后EVA样品的绝缘性能均有不同程度的提高,随着辐照剂量的增加,体积电阻率先增大后减小,介电常数先减小后增大,电气强度先增大后减小。

The EVA material was modified by electron beam melting irradiation,and the effects of different irradiation does on gel content,mechanical properties,volume resistivity,dielectric properties,breakdown characteristics and molecular structure of EVA samples were studied.The results show that the gel content of EVA sample first increases and then decreases with the increase of irradiation dose.When the irradiation dose is 100 kGy,the gel content reaches 95.7%.Irradiation can reduce the elongation at break of EVA samples,while the tensile strength first increases and then decreases with the increase of irradiation dose.After irradiation,the insulating properties of EVA samples improve to varying degrees,with the increase of irradiation dose,the volume resistivity first increases and then decreases,the dielectric constant first decreases and then increases,and the electric strength first increases and then decreases.