摘要
以正硅酸乙酯为原料,调节pH值为碱性,通过溶胶-凝胶工艺制备单分散SiO2球,用偶联剂甲基丙烯酰(3-三甲氧基硅烷)丙酯(MPS)进行改性,得到MPS-SiO2球形粒子。以MPS-SiO2球为种子,苯乙烯为壳单体,乳液聚合法制备核壳结构的MPS-SiO2/PS复合粒子。透射电镜观察复合粒子形态的结果表明,MPS-SiO2球粒径为200 nm左右时,得到覆盆子状核壳结构;MPS-SiO2球粒径为80 nm左右时,得到包含多个MPS-SiO2球的多核壳结构。差示扫描量热法考察MPS-SiO2/PS复合粒子玻璃化转变温度(Tg)的结果表明,随着MPS-SiO2球含量增加,复合粒子的Tg增加;随着MPS-SiO2球粒径减小,复合粒子的Tg也有所增加。
Monodispersed SiO2 spherical particles prepared by hydrolysis of tetraethoxy method under alkalescent condition. MPS-SiO2 were gained through the monodispersed silane via sol-gel SiO2 modified by 3-（trimethoxysilyl） propyl methacrylate （MPS）. MPS-SiO2/PS core-shell composite particles were prepared by emulsion polymerization. The MPS-SiO2 were employed as seeds and the styrene as the monomer of shell. The morphologies of composite particles were observed by transmission electron microscopy. The result indicated that composite particles were raspberry-like structure and multicore-shell structure when MPS-SiO2 were 200 nm and 80 nm, respectively. The glass transition temperature Ts of composite particles examined by DSC. The result indicated that Tg of composite particles increased as enhancing amount of MPS-SiO2. The smaller size of MPS-SiO2, the higher Tg of composite particles.
出处
《应用化工》
CAS
CSCD
2007年第12期1171-1175,共5页
Applied Chemical Industry
基金
国家自然科学基金项目(20174007)
