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

摘要:

以可聚合单体对苯乙烯磺酸钠（NaSS）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和粒径分布的影响。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、形貌及催化性能等进行了表征。研究结果表明：反应后1~3 h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（NaBH4）还原对硝基苯酚(4-NP)具有较高的催化活性。

Abstract:

Monodisperse polymer microspheres P(St-AN) were prepared through two-steps polymerization stabilized with polymerizable anion-charged 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) were of uniform structure and Ag nanoparticles of face centered cubic crystal structure were 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.