摘要
使用种子聚合法设计制备以聚苯乙烯(PS)为核、以聚丙烯酸(PAA)为壳的具有酸敏性的PS/PAA复合结构核壳微球,然后将纳米金粒子通过与羧基的结合作用接到PS/PAA复合结构微球表面,就得到了纳米金催化剂。首先,以分散聚合法制备大粒径分散性较好的PS种子微球,第二步将PS种子微球磺化,改善了种子球体表面的亲水性,进而讨论制备PS/PAA核壳结构微球的可行性。通过对PS微球的成功磺化,经红外光谱(IR)表征,证明PAA已经成功的包覆在PS种子的表面,所以成功制备了PS/PAA核壳结构微球,说明磺化的方法解决了像丙烯酸这类亲水性较强的单体,当以水为介质时在PS微球表面不容易直接聚合生成核壳结构的问题。最后将制得的纳米金催化剂催化亚甲基蓝的还原反应,测试其催化能力。
The seed polymerization method was used to prepare composite core-shell microspheres in which polystyrene（PS） was used as the core,and polyacrylamide（PAA） was used as shell,and then gold nanoparticles were grafted to the PS / PAA composite structure microsphere surface through the binding of nanoparticles and carboxyl groups,and nano-gold catalyst was obtained.Firstly,PS microspheres were synthesized by dispersion polymerization,then PS seed microspheres were sulfonated to improve microspheres’ surface hydrophily.The possibility of the pathway to prepare the PS/PAA composite core-shell microspheres was discussed.The characterization by IR spectroscopy showed that the PS/PAA composite core-shell microspheres were successfully prepared.Typically,to get a core-shell structure,the direct polymerization of hydrophilic monomer on the PS microspheres is very difficult when water is used as the medium.The method solved this problem.At last,the prepared nano-gold catalyst was used in catalytic reduction reaction of methylene blue to test its catalytic activity.
出处
《辽宁化工》
CAS
2013年第7期769-771,775,共4页
Liaoning Chemical Industry
关键词
分散聚合
种子聚合
核壳结构
纳米金
dispersion polymerization
seed polymerization
shell-core microspheres
gold nanoparticles
PS/PAA
