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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 acid-sensitive PS / PAA composite core-shell microspheres with polystyrene (PS) as core and polyacrylic acid (PAA) as shell were designed and prepared by using seed polymerization method. Then the nano- The role of received PS / PAA composite microspheres surface, we got the nano-gold catalyst. Firstly, the PS seed microspheres with better dispersity were prepared by dispersion polymerization. The second step was to sulfonate the PS seed microspheres to improve the hydrophilicity of the surface of the seed spheres. Then, the preparation of PS / PAA core-shell structure The feasibility of microspheres. The PS / PAA core-shell microspheres were successfully prepared by the successful sulfonation of PS microspheres and IR spectrum characterization, indicating that PAA has been successfully coated on the surface of PS seeds. For monomers such as acrylic, which have high hydrophilicity, it is not easy to directly polymerize on the surface of PS microspheres to form core-shell structure when using water as medium. Finally, the prepared nano-gold catalyst catalyzes the reduction of methylene blue to test its catalytic ability.