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基于纳米SiO2表面羟基与γ-甲基丙烯酰氧基丙基三甲氧基硅烷间的缩合反应,于SiO2表面引入双键。以甲基丙烯酸甲酯为单体,偶氮二异丁腈为引发剂,采用原位自由基聚合的方法,制备了聚甲基丙烯酸甲酯/SiO2纳米复合材料。FTIR和TGA证实聚甲基丙烯酸甲酯大分子链成功接枝在SiO2表面。聚合体系黏度是影响SiO2表面聚甲基丙烯酸甲酯接枝率的关键因素。甲基丙烯酸甲酯浓度为6 mol/L,偶氮二异丁腈浓度为0.05～0.1 mmol/L时,SiO2表面聚甲基丙烯酸甲酯接枝率可达到94%;SiO2用量对表面接枝聚合没有影响。
Based on the condensation reaction between the surface hydroxyl groups of Nano-SiO2 and γ-methacryloxypropyltrimethoxysilane, a double bond was introduced on the surface of SiO2. Polymethylmethacrylate / SiO2 nanocomposites were prepared by in situ free radical polymerization using methyl methacrylate as monomer and azobisisobutyronitrile as initiator. FTIR and TGA confirmed that polymethylmethacrylate macromolecular chains were successfully grafted on the surface of SiO2. The viscosity of the polymerization system is the key factor affecting the grafting degree of polymethyl methacrylate on the SiO2 surface. When the concentration of methyl methacrylate was 6 mol / L and the concentration of azobisisobutyronitrile was 0.05 ~ 0.1 mmol / L, the grafting degree of polymethylmethacrylate on SiO2 surface could reach 94%. The amount of SiO2 grafted on the surface Aggregation has no effect.