Pickering细乳液法制备无机聚合物复合中空微球

Synthesis of inorganic polymer composite hollow microsphere via Pickering miniemulsion polymerization

采用有机胺催化水解正硅酸乙酯生成SiO_2纳米粒子,经硅烷偶联剂改性后,获得了两亲性的SiO_2纳米粒子。以其作为Pickering乳化剂,成功制备了稳定的Pickering细乳液并合成了无机聚合物复合中空微球。通过红外光谱、透射电镜、扫描电镜和热重分析等测试手段对复合中空微球进行了表征。结果表明:引发剂为偶氮二异庚腈、交联剂用量为0.2%时合成了直径在1.5~2μm之间的复合中空微球。采用低温引发剂有利于合成均一粒径的中空微球;交联剂的用量能够改变微球的粒径大小;不同的单体类型会影响微球的粒径分布。

Amphiphilic silica nanoparticles were prepared by organic amine-catalyzed hydrolysis of TEOS and insitu surface modification used silane coupling agent.Stable Pickering miniemulsion was prepared by using the asprepared SiO_2 nanoparticles as Pickering emulsifier.Inorganic polymer composite hollow microspheres were successfully synthesized.The products were characterized by fourier-transformed infrared spectroscopy（FT-IR）,transmission electron microscopy（TEM）,scanning electron microscopy（SEM）and thermogravimetric analysis（TGA）.The results showed that the microspheres with diameter between 1.52μm were successfully synthesized when the initiator was2,2′-azobis（2,4-dimethylvaleronitrile）and the amount of crosslinking agent was 0.2%.The low temperature initiator was favorable for the synthesis of hollow microspheres with uniform particle size.The amount of cross-linking agent had effect on the particle size of microspheres.Different monomer types also affected the particle size distribution of the as-prepared microspheres.