Pickering乳液聚合制备中空聚苯乙烯复合微球  

Synthesis of hollow SiO_2/polystyrene composite microspheres by Pickering emulsion polymerization

作　　者：张卫红[1] 范晓东[1] 范伟伟[1] 田威[1] 

机构地区：[1]西北工业大学理学院应用化学系,陕西西安710072

出　　处：《功能材料》2010年第4期644-647,651,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20674060)

摘　　要：通过改进Stber法制得纳米SiO2,并经硅烷偶联剂改性使其表面具有较佳两亲性,以该两亲性纳米粉体为油/水界面稳定剂构建O/W型Pickering乳液,引发油相中的苯乙烯单体聚合,在不同苯乙烯与成孔溶剂正辛烷的比例下制得了SiO2/聚苯乙烯复合微球;经傅里叶红外变换光谱(FTIR)、凝胶渗透色谱-多角度激光光散射仪(GPC-MALLS)、热失重分析仪(TGA)、扫描电子显微镜(SEM)及透射电子显微镜(TEM)检测,证实复合微球具有中空的结构特点,并依此讨论了中空微球的形成机理。Nano-SiO2,which were synthetized via improved Stber method,were endowed with amphiphilic surface by means of surface modification with long chain alkyl silane coupling agent.Stable Pickering emulsion was fabricated using this amphipathic nano-SiO2 particles as stabilizer.The SiO2/polystyrene composite microspheres with hollow structure were successfully synthetized through adjusting the ratio between styrene monomer and n-octane.The products were characterized by fourier transformation infrared spectrum （FTIR）,gel permeation chromatography coupled with a multi angle laser light scattering photometer （GPC-MALLS）,thermogravimetic analysis （TGA）,scanning electron microscopy （SEM） and transmission electron microscopy （TEM）.A possible mechanism for the formation of the hollow composites by Pickering emulsion polymerization was proposed at last.

关 键 词：纳米SIO2 Pickering乳液聚合 聚苯乙烯 空心 

分 类 号：TQ316.3[化学工程—高聚物工业]