Surface modification of precipitated silica by styryl-tetra-coordinate silicon

The influence of ultrasonic radiation time and pulse mode on yield of penta-coordinated silicon synthetised by means of ultrasound and heating are investigated. The surface of precipitated silica was modified by styryl-tetra-coordinate silicon based on penta-coordinated silicon. The structure and morphology of both non-modified and modified silica were characterized by Fourier transform infrared analysis,simultaneous TG-DTA/DSC apparatus,contact angle apparatus and laser diffraction size analysis. Tensile strength of methyl vinyl vulcanizates reinforced with precipitated silica was tested. The results show that yield of penta-coordinated silicon with incremental pulse reaches 84.5% under ultrasonic radiation for 10min. Static contact angles of modified silica increase with the dosage of modifier. The maximum value of tensile strength of vulcanizates reaches 6. 71MPa in the condition,when dosage of modifier is 10% of the mass of silica. The dispersion is significantly improved and the average particle size of aggregate is observably reduced with narrower distribution.