Effect of ball milling on thermal behaviors of modified silicon dioxide

Modified silicon dioxides were obtained by ball milling under different grinding conditions,and were characterized using thermogravimetric analysis(TGA),X-ray powder diffraction analysis (XRD),FT-IR spec- tra analysis and particle size analysis.It is found that there is no mass loss on the TGA curve of silicon dioxide raw material,but there is an apparent mass loss on the TGA curve of ball-milling silicon dioxide.The results from TGA curves indicate that silane coupling agent KH-560 is not physically absorbed but chemically absorbed onto the surface of modified silicon dioxide after ball-milling.The results from structural analysis indicate that the structures of different modified silicon dioxide are quite different.Therefore,the differences between the thermal behaviors of modified silicon dioxide are consistent with the differences between the structures of corre- sponding modified silicon dioxide.