二氧化硅“粒子簇”的构建及其对硅橡胶力学性能的影响

Construction of silica"particle clusters"and its effect on mechanical properties of silicone rubber

为改善传统硅橡胶抗冲击性及力学强度较差的不足,用硅烷偶联剂改性二氧化硅并构建二氧化硅“粒子簇”,然后将改性二氧化硅和二氧化硅“粒子簇”分别填充到硅橡胶内部,用动态热机械分析仪测试硅橡胶力学性能,分析其对硅橡胶压缩性能及动态力学性能的影响。结果表明:硅橡胶压缩模量随着改性二氧化硅或二氧化硅“粒子簇”质量分数的增大而增大,且相同质量分数下二氧化硅“粒子簇”对硅橡胶的补强效果比改性二氧化硅更显著。二氧化硅“粒子簇”质量分数为15%时,随着扫描频率从0.1 Hz增加到40.0 Hz,硅橡胶的储能模量能增大约49倍,表现出更明显的剪切变硬性能。由此可见,采用二氧化硅“粒子簇”填充硅橡胶,能形成一种高强度、高抗压缩性和优异的剪切变硬性能的硅橡胶材料。

In order to improve the poor impact resistance and mechanical strength of traditional silicone rubber,silica was modified with silane coupling agent and silica"particle clusters"were constructed.Then the modified silica and silica"particle clusters"were filled into silicone rubber respectively.The mechanical properties of silicone rubber were tested by dynamic thermal mechanical analyzer.The effect of modified silica or silica"particle clusters"on the compression and dynamic mechanical properties of silicone rubber was analyzed.The results show that the compression modulus of silicone rubber increases with the increase of mass fraction of silica,and the reinforcement effect of silica"particle clusters"on silicone rubber is more significant than that of modified silica at the same mass fraction.When the mass fraction of silica"particle clusters"is 15%,the storage modulus of silicone rubber increases about 49 times with the increase of scanning frequency from 0.1 Hz to 40.0 Hz,showing more obvious shear hardening property.It can be seen that the silicone rubber filled with silica"particle clusters"can form a kind of silicone rubber material with high strength,high compression resistance and excellent shear hardening properties.