环氧丙烷接枝聚合改性超细二氧化硅的研究

Study on modification of ultrafine silicon dioxide directly with propylene oxide by graft polymerization

研究了环氧丙烷在SiO2表面的直接接枝聚合改性反应,以及在硅烷偶联剂KH792改性后的SiO2表面进行的间接接枝聚合改性反应,并用红外光谱对改性后的产品进行分析。实验结果表明,在110℃和一定压力下,SiO2表面的羟基具有较高的活性,环氧丙烷就可以在SiO2表面直接接枝聚合反应,从而摆脱了对品种稀少的硅烷偶联剂的依赖。最后阐述了聚合反应机理。

The direct modification of ultra-fine silicon dioxide with propylene oxide, and the indirect modification with silane coupler KH792 is studied and the modified product is analyzed by infrared spectrum. Results show that when the temperature is 110℃ and at a certain pressure,hydroxyl group on the surface of silicon dioxide is so active that propylene oxide could carry through direct graft polymerization on the surface of silicon dioxide. So the dependence on the scarce varieties of silane couplers could be broken away. The mechanism is also explained.