T hree kinds of copper pow ders w ere added to modify the properties of the LDPE/LLDPE composite films , which were fabricated by blowing method . The sizes , dispersion of copper powders were determined by laser particle size distribution and scanning electron micro-scope (SEM) .The thermal conductivities ,electric conduction and barrier properties of the com-posite films were analyzed by conduction calorimeter and conduction tester , moisture permeation meter and oxygen permeation measurement . The aging resistance of the composite films was mearsured using the thermal oxygen aging machine and universal tensile machine . The results showed that the copper powders with particle size of 17 .2 μm were flaky and homogeneously dispersed in the polymer matrix . Moreover ,with the addition of copper powder , the thermal conductivity of the composite films increased to 1 .426 W/(m · K) and the composite films met the requirement of antistatic electricity . In case of barrier properties , the water permeation re-sistance had an increase of 35% after adding the flaky copper powder . After aging , the me-chanical properties of composite films were reduced , but the strength still achieved relatively high values .%选用3种不同的铜粉,添加到低密度聚乙烯/线性低密度聚乙烯树脂中进行共混后,吹制成膜.通过激光粒度分布仪、扫描电子显微镜确定铜粉的粒径、形貌和分散状态;通过导热仪、导电测试仪、透湿仪和透氧仪分析检测复合薄膜的导热、导电性能和阻隔性能;通过热氧老化试验和力学性能测试分析了复合薄膜的耐老化性能.结果表明:3种铜粉中,粒径为17.2μm的片状铜粉分散均匀.添加铜粉后,复合薄膜导热系数达到了1.426W/(m·K),导电性能达到抗静电要求;复合薄膜的阻隔性能得到很大提高,阻水能力提高了35%.复合薄膜经老化后的力学性能有所降低,但是强度仍可以达到较高的值.
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