| Summary: | SiO _2 particles were modified by γ -aminopropyltriethoxy silane (KH550) and γ -(2,3-epoxypropoxy)propyltrimethoxy silane (KH560) in sequence to prepare SiO _2 particles with silicone-methoxy groups on surface (SiO _2 -s-Si(OCH _3 ) _3 ). X-ray photoelectron spectroscopy (XPS) and thermal gravimetric analysis (TGA) were used to characterize the modified SiO _2 particles. The SiO _2 -s-Si(OCH _3 ) _3 particles and tetramethoxysilane were used to co-cure hydroxyl silicone oil. The strong interfacial interactions between silicone rubber and fillers, which came from hydrolyzed SiO _2 -s-Si(OCH _3 ) _3 particles in situ reacting with hydroxyl silicone oil, had a great effect on the properties of composites. The mechanical properties, thermal conductivity, dielectric strength and volume resistivity of SiO _2 -s-Si(OCH _3 ) _3 /silicone rubber composites were considerably higher than that of pristine SiO _2 /silicone rubber composites at the same content of SiO _2 , while the dielectric constant and dielectric loss tangent of SiO _2 -s-Si(OCH _3 ) _3 /silicone rubber composites was lower than that of pristine SiO _2 /silicone rubber composites at the same content of SiO _2 .
|
|---|