无皂乳液聚合法制备聚甲基丙烯酸甲酯包覆厚度可控的纳米核-壳二氧化硅微球  

Preparation of Monodisperse Silica/PMMA Core/Shell Nanoparticles with Controllable Shell Thickness by Soap-free Emulsion Polymerization

作　　者：方建勇[1] 刘晓丽[1] 路子阳[1] 赵春山[1] 高歌[1] 杨文胜[1] 刘凤岐[1] 

机构地区：[1]吉林大学化学学院,长春130012

出　　处：《高等学校化学学报》2008年第10期2079-2082,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20274014)资助

摘　　要：用改进的St ber法和无皂乳液聚合法制备窄分布的二氧化硅/PMMA核-壳纳米微球.用改进的St ber法将3-乙氧基甲基丙烯酸丙基硅烷(MPS)修饰在纳米的二氧化硅表面后,用无皂乳液聚合法制备核-壳纳米微球.该法简单有效且得到厚度均匀的聚合物包覆层.随着单体MMA用量的增加,用动态光散射法测量,PMMA壳层的厚度从6.4 nm增加到96.3 nm.热重分析表明,PMMA的含量从22.25%增加到93.41%.扫描电子显微镜和透射电子显微镜结果表明,得到的是包覆良好、表面光滑的核-壳无机/聚合物纳米微球.Monodisperse silica/PMMA core-shell nanoparticles were prepared by soap-free emulsion polymerization and the modified Stober process. 3-Methaeryloxy-propyltriethysilane（MPS） tailored surfaces of silica can he obtained from sol-gel preparation with Stoher process. The core-shell nanopartieles prepared from the soap-free emulsion polymerization were efficiently created with a uniform polymer shell. The shell thickness of PMMA was increased from 6. 4 nm to 96. 3 nm as judged by dynamic light scattering with increasing the amount of the MMA monomer. Thermogravimetric analysis result indicates the mean PMMA contents of 22.25%-93.41%. The results of SEM and TEM show a well-defined core-shell morphology for the inorganic/PMMA nanoparticles.

关 键 词：无皂乳液聚合 纳米二氧化硅 核-壳包覆 聚甲基丙烯酸甲酯 

分 类 号：O631[理学—高分子化学]