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单分散二氧化硅-苯乙烯复合微球的制备及表征

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Abstract:

利用Stober方法制备了单分散SiO2微球,先用硅烷偶联剂(γ-methacrylicpropyltrimethoxysilane,MPS)对SiO2进行改性,然后以改性的SiO2为种球,聚乙烯吡咯烷酮(polyvinylpyrrolidone,PVP)为稳定剂,偶氮二异丁腈[2,2'-azobis(isobutyronitrile),AIBN]为引发剂,采用分散聚合法制备了单分散SiO2-苯乙烯(styrene)(简写为SiO2-St)复合微球。分析了不同条件下合成的SiO2-St复合微球的形态,考察了经MPS改性的SiO2微球的粒径、PVP,AIBN和苯乙烯的浓度对复合微球形态的影响。结果表明改性后的SiO2微球能够成功地被苯乙烯包覆形成SiO2-St复合微球。粒径为250nm的改性SiO2微球的复合效果最佳,形成的SiO2-St复合微球表面光滑,球形度较好,具有良好的单分散性。最优的反应条件是改性SiO2为0.1mol/L,无水乙醇为20mL,PVP为0.23mmol/L,AIBN为6.10mmol/L,苯乙烯为0.60mmol/L和水5mL。

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