摘要
在醇/水混合介质中用分散聚合方法制备二氧化硅/聚苯乙烯单分散复合微球。探讨了分散聚合法制备无机/有机复合微球的过程, 考察了分散聚合反应的动力学过程。SEM和TEM观察结果表明: 在醇/水混合介质中, 用PVP K 30作为稳定剂, 用分散聚合法制备了单分散的以二氧化硅为核、聚苯乙烯为壳的复合微球,成功实现了聚苯乙烯对二氧化硅的包覆, 复合微球的平均粒径为1 25μm, 分散系数ε为0 035, 达到了单分散水平。还考察了稳定剂的浓度对复合微球粒径的影响, 当稳定剂PVP K 30浓度增加时, 发现微球的粒径有所减小, 而微球的单分散性提高。
The silicon dioxide (SiO2)/polystyrene (PS) composite microspheres were prepared by dispersion polymerization in ethanol/water medium. The process of dispersion polymerization was investigated, and the kinetics of dispersion polymerization with nano-SiO2 in the reaction system was studied. The samples were characterized by microscopy techniques (SEM, TEM). It is shown that nano-SiO2 particles are encapsulated by PS after dispersion polymerization in ethanol/water medium using polyvinylpyrrolidone (PVP K-30) as stabilizer. The average size of the composite microsphere is 1.25 μm and the dispersion coefficient Ε is 0.035. The effects of stabilizer concentration on the size of the microspheres were studied.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2005年第2期21-26,共6页
Acta Materiae Compositae Sinica
基金
863计划国际合作项目(2002AADF3202)
关键词
分散聚合
二氧化硅
聚苯乙烯
复合微球
单分散性
包覆
Composite materials
Dispersions
Encapsulation
Nanostructured materials
Polystyrenes
Scanning electron microscopy
Silica
Transmission electron microscopy
