草莓状银/聚苯乙烯-丙烯腈复合微球制备及其催化性能

Synthesis of Raspberry-like Composite Microsphere of Ag / Polystyrene-Acrylonitrile and its Catalytic Performance

以可聚合单体对苯乙烯磺酸钠（Na SS）作稳定剂,采用两步阴离子稳定分散聚合法,制备了单分散聚苯乙烯-丙烯腈P（St-AN）共聚微球,研究了丙烯腈单体加入时间对聚合物微球粒径及其分布的影响。并以微球为模板通过化学沉积法得到了分布均匀、单分散草莓状的Ag/P（St-AN）复合微球。通过傅里叶红外光谱、X射线衍射、扫描电镜和紫外-可见光谱对复合微球的组成、结构、形貌及催化性能进行了表征。结果表明,反应后1～3h补加丙烯腈可以得到600～800 nm单分散模板微球。得到的Ag/P（St-AN）复合微球表面具有较均一的结构,纳米银粒子具有面心立方结构,在微球表面有较好的分散性及稳定性,同时Ag/P（St-AN）复合微球对硼氢化钠（Na BH4）还原对硝基苯酚（4-NP）具有较高的催化活性。

Monodisperse polymer microspheres polymerization stabilized with polymerizable anion-c P （St-AN）were prepared through two-steps harged monomer Sodium Styrene Sulfonate （NaSS） The influence of acrylonitrile dropping time on particle size and dispersity were discussed. Using the P （St-AN） particles as template, raspberry-like Ag/P （St-AN）composites were obtained by chemical deposition. Composition, structure, morphology and catalytic performance of the composite particles were characterized by fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and UV-visible spectroscopic techniques. The results revealed that the P （St-AN） template particles were uniform spherical particles when the acrylonitrile were dropped 1 -3 h after the reaction beginning. The particle size was between 600 nm and 800 nm. The obtained Ag/P （St-AN） was of uniform structure and Ag nanoparticles of face centered cubic crystal structure was well coated on the surface of the particles with good dispersity and stability. The Ag/P （St-AN） composite particles were used as the catalyst in 4-nitrophenol reduction to 4-aminophenol with NaBH4 as the reducer, and the reduction was significantly enhanced.