二氧化硅/聚苯乙烯杂化材料制备及性能研究

Preparation and Characterization of Polystyrene/Silicon dioxide Hybrid Materials

通过自组装在二氧化硅粒子表面引入含溴化合物。并以其为引发剂,采用原子转移自由基聚合的方法,制备二氧化硅/聚苯乙烯杂化材料。通过改变表面引发聚合条件,制备系列聚苯乙烯接枝量的杂化材料。采用FT-IR、XPS、TGA、粒径分析仪与扫描电镜对杂化材料结构、组成和性能进行研究。结果表明:二氧化硅表面引发原子转移自由基聚合(SI-ATRP),呈现一定的"活性"特点,反应12小时后最大接枝量达到47%。并且杂化材料在不同的溶剂中具有不同的粒径;扫描电镜显示,杂化材料因其表面接枝的聚苯乙烯使其团聚现象有所降低。

The silicon dioxide surface initiators containing bromine had been synthesized by self assembly, which was used to initiate styrene in order to prepare hybrid materials from the surface of silicon dioxide. The series of hybrid materials had been prepared via changing polymerization conditions. The FT-IR, XPS, TGA and so on were used to characterize the surface structures compositions and properties of hybrid materials. The results show that the surface initiated atom transfer radical polymerization （SI-ATRP） from the surface of silicon dioxide owns ＇living＇ character. The most grafting density reaches 47 % after 12 h. Furthermore, the hybrid materials possess different granularities in different solvent. SEM indicates that the decrease of hybrid materials assembled because of grafted polystyrene.