文献类型：期刊文献

中文题名：核-壳型聚苯乙烯/二氧化硅复合微球的制备

英文题名：Preparation of Core-Shell Polystyrene/Silica Composite Microspheres

作者：杨晓玲[1];朱以华[1];罗美芳[1];李春忠[1]

机构：[1]华东理工大学超细材料制备与应用教育部重点实验室,上海200237

年份：2003

卷号：3

期号：6

起止页码：544

中文期刊名：过程工程学报

外文期刊名：The Chinese Journal of Process Engineering

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：国家863计划资助项目(编号:2002AA302208);上海市纳米专项资助项目(编号:0243nm069);教育部跨世纪人才基金资助项目

语种：中文

中文关键词：自组装;聚苯乙烯/二氧化硅复合微球;热分解;扩散;制备

外文关键词：self-assembly; PS/SiO2 composite microsphere; thermal decomposition; diffusion

摘要：利用层层自组装的方法制备了粒径和组成可裁剪、具有核-壳式结构的单分散聚苯乙烯(PS)/二氧化硅(SiO2)复合微球.对复合微球进行热处理除去有机物中心,制备出壁厚可剪裁的空腔硅球,并对复合微球的热分解过程进行了研究.透射电镜(TEM)照片显示二氧化硅纳米颗粒在中心外生成均匀壳层,而煅烧后则可得到轮廓分明的球形空腔;比较PS,SiO2和复合球体及热处理后的粉体的红外光谱,可分别验证二氧化硅的成功组装和热处理过程中作为中心的PS的完全去除.在吸附相同层数的前提下,随着所选用的二氧化硅纳米粒子的粒径的增大(10～40 nm),复合微球的粒径增大,空腔球体的壁厚增加,中心粒子热分解的活化能增大.复合微球的热分解机理符合三维扩散机理.
The core-shell polystyrene (PS)/silicon dioxide (SiO2) composite microspheres with tailored dimensions and compositions were prepared by layer-by-layer self-assembly. The organic cores were removed by heat treatment and hollow silica spheres with tailored wall thickness were produced. The thermal decomposition process of the composite microspheres was studied. TEM photographs showed that SiO2 nanoparticles formed a uniform shell round the core, which turned into a clear-cut hollow sphere after calcination. The successful assembly of SiO2 and the complete removal of PS which acted as the core in heat treatment, can be respectively verified by FTIR comparison of PS, SiO2, composite microspheres and the powders after heat treatment. Assuming the same number of absorbed layers, with the increase of the selected SiO2 nanoparticles diameter (10, 20, 40 nm), the composite microsphere diameter increases, the hollow spheres wall thickens, and the active energy of thermal decomposition of the core particles increases. The thermal decomposition of the composite microspheres fits in with the D3 diffusion mechanism.