中文摘要：

通过室温下共混的方法制备出甲基乙烯基硅橡胶（MVQ）和沉淀法白炭黑（SiO2）的混炼胶，在150～180℃下实现混炼胶和低密度聚乙烯（PE-LD）的熔融共混，制备出改性硅橡胶。研究结果表明，PE-LD的加入可显著改变混炼胶的性能，随着PE-LD与混炼胶的质量比的增加，材料拉伸强度、撕裂强度、扯断伸长率和体积电阻率明显提高，但耐热老化性能下降，材料硬度增加。PE-LD与混炼胶的质量比在30／100～40／100之间时，可获得综合性能优良的改性硅橡胶。

英文摘要：

Precipitated silica was incorporated into methyl vinyl silicone （MVQ） using a twin roll miller at room temperature, and the compound was blended with low density polyethylene （PE-LD） between 150 ℃ and 180 ℃. The tensile strength, tear strength, Shore A hardness, and volume resistivity of the modified MVQ silicone rubber were improved with increasing content of PE-LD, while the heat resistance decreased. An optimal set of properties was obtained in the mass ratio of PE-LD to MVQ between 30/100 and 40/100.