摘要
用溶胶凝胶法制备出表面含可聚合官能团的亚微米SiO2粒子,以甲基丙烯酸甲酯(MMA)为聚合单体,甲基丙烯酸二甲氨基乙酯(DMEMA)为功能单体,在复合乳化剂SE-10/OP-10的作用下,通过SiO2粒子表面上的乳液聚合成功制备出了表面光滑且具有核壳结构的SiO2/PMMA-DMEMA复合粒子,并对得到的复合粒子采用透射电镜(TEM)、红外光谱(FT-IR)、光电子能谱(XPS)和热失重分析(TGA)进行表征。TEM结果显示,SiO2处于内层,大小约170 nm;外层包覆了厚度约20 nm的聚合物。XPS表明,SiO2被聚合物包覆后,N元素的摩尔分数为2.08%,其表面Si元素的摩尔分数降到2.21%。复合粒子经TGA分析后,聚合物与SiO2质量比(fp)为69.4/100,其中PMMA和PDMEMA含量分别为29.0%和10.1%;复合粒子经甲苯抽提后,聚合物与SiO2的质量比(fp)为60.1/100。聚合物的有效接枝率(fe)约为86.6%。
The submicron SiO2 particles of which surface have the polymerizable group were prepared basing on the sol-gel method. Taking methyl methacrylate （MMA） as the polymerization monomer and 2-（dimethylamino） ethyl methacrylate （DMEMA） as the functional monomer, SiO2/PMMA-DMEMA composite particles with core-shell structure and smooth surface were successfully prepared by emulsion polymerization on the surface of SiO2 using the composite emulsifier （SE-10/OP-10）, and the particles morphology and encapsulation effect were characterized by FT-IR, TEM, XPS and TGA. TEM results indicate that the diameter of SiO2 is about 170 nm and its surface is encapsulated by polymer with thickness of about 20 nm. XPS analysis exhibits that the mole fraction of N element of SiO2 encapsulated by polymer is about 2.08% and the mole fraction of Si element decreases to 2.21%. TGA curves of composite particles imply that the mass ratio of polymer to SiO2（fp） is 69.4/100, in which the content of PMMA and PDMEMA is 29.0% and 10.1% respectively, and the fp value is 60.1/100 when the composite particles are extracted by toluene. The the efficiency grafting ratio of polymer （fe） is about 86.6 %.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2014年第1期127-130,共4页
Polymer Materials Science & Engineering
基金
广东省自然科学基金资助项目(S2013010013580
9452840301003542)
中山市科技计划项目(20092A203)
关键词
包覆
乳液聚合
亚微米复合粒子
核壳结构
encapsulation
emulsion polymerization
suhmicron composite particles
core-shell structure
