摘要
采用两步反相微乳液法原位聚合制备纳米SiO2/聚甲基丙烯酸甲酯(polymethylmethacrylate,PMMA)复合微粒。首先,通过混合2 个分别增溶有2种反应物的微乳液,制备纳米SiO2粒子;然后,向混合后的微乳液中滴加单体及引发剂,通过单体的原位聚合反应得到SiO2/ PMMA复合微粒。通过相图研究:确定了微乳液法制备复合微粒时初始组分的用量。通过透射电子显微镜、红外光谱、热重分析、X射线光电 子能谱等手段对复合微粒进行了表征。结果表明:聚合后的PMMA包覆在SiO2表面,复合微粒的平均粒径为30nm,分散性良好。复合微粒 中不能被抽提出来的聚合物占10.08%,这部分聚合物以Si—O—C键形式接枝在SiO2表面。
Nano-silica/polymethylmethacrylate (PMMA) composite particles were in situ prepared by two-step inverse microemulsion method. Silica nanoparticles were prepared firstly by mixing two water/oil inverse microemulsion systems and then the monomer MMA were dropped into the mixed microemulsion system. The nano-silica/PMMA composite particles were obtained by in situ polymerisation. The initial dosages of all compositions for preparing composite particles were determined by phase diagram. The nano-silica/PMMA composite particles were characterized by transmission electron microscope, thermogravimetry, Fourier transform infrared spectroscope and X-ray photoelectron spectroscope. The results show that PMMA is coated on the surface of silica after polymerisation and the composite particles have a good dispersibility with an average diameter of 30 nm. There is 10.08% polymer released in the composite particles, which can not be extracted by acetone for a long time and is grafted on the surface of silica by Si-O-C bonds.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2005年第3期304-308,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金重点(20236020)
国家杰出青年基金(20325621)资助项目
关键词
反相微乳液
纳米二氧化硅
原位聚合
复合微粒
Cladding (coating)
Composite materials
Dispersions
Emulsion polymerization
Fourier transform infrared spectroscopy
In situ processing
Microemulsions
Nanostructured materials
Phase diagrams
Silica
Thermogravimetric analysis
Transmission electron microscopy
X ray photoelectron spectroscopy