电子束辐照对高密度聚乙烯/炭黑导电复合材料电阻率的影响

Influence of Electron Beam Irradiation on Resitivity of High Density Polyethylene/Carbon Black Conductive Composites

研究了电子束辐照固态和熔融态高密度聚乙烯／炭黑（ＨＤＰＥ／ＣＢ）导电复合材料的电性能随辐照温度和辐照剂量的变化。结果表明，对固态或熔融态辐照材料而言，其电阻率均随温度的升高而增大。等剂量下，固态辐照材料的ＰＴＣ强度比熔融态辐照的要高。两种状态经高剂量（＞２００ｋＧｙ）辐照后其材料ＮＴＣ效应消失。ＤＳＣ测试证明电阻率的改变与基体的结晶行为以及交联链的形成密切相关。

Influence of electron beam irradiation on the resitivity of carbon black loaded high density polyethylene(HDPE/CB) conductive composites were studied The results showed that resitivity increased with increasing temperature The PTC intensity of composites irradiated at room temperature was higher than that irradiated at melting temperature under the same irradiation dose For two different irradiation conditions, NTC effect disappeared when irradiation doses were over 200kGy The changes of resitivity were related to crystallinity and crosslinking of polyethylene by irradiation