School of Science, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China.
School of Science, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China; MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China.
J Colloid Interface Sci. 2017 Apr 1;491:294-304. doi: 10.1016/j.jcis.2016.12.047. Epub 2016 Dec 23.
Raspberry-like multihollow polymer microspheres were prepared by seeded swelling polymerization and decorated with silver nanoparticles (AgNPs) in the presence of polyvinylpyrrolidone (PVP) which acted as both reducing and stabilizing agent. Formation mechanism of the raspberry-like multihollow microsphere was discussed on the basis of water absorption of sulfonated groups in the seeded swelling polymerization. Effects of weight ratio of sodium 4-vinylbenzenesulfonate to styrene (NaSS/St) of the seed particles, the concentration of PVP and [Ag(NH)] ions on the properties of polymer/Ag nanocomposite microspheres were investigated by microscopic observation, nitrogen adsorption/desorption isotherms, UV-vis absorption spectra, X-ray diffraction patterns and thermogravimetric analysis. The results demonstrated that the raspberry-like multihollow microspheres were successfully fabricated by controlling over the NaSS/St of the seed particles in the seeded swelling polymerization by which the fabrication of hollow structure became simple and convenient. The spherical AgNPs were loaded on the polymer microsphere by in-situ chemical reduction due to the stabilization and reduction of PVP and the attraction between sulfonated groups and [Ag(NH)] ions. The raspberry-like multihollow polymer/Ag microspheres showed good catalytic activity and reusability in the degradation of methylene blue in the presence of NaBH.
采用种子溶胀聚合法制备了具有覆盆子状多壳层结构的聚合物微球，在聚维酮（PVP）的存在下，通过原位还原反应将银纳米粒子（AgNPs）修饰到微球表面，PVP 同时起到还原和稳定的作用。在种子溶胀聚合过程中，磺酸基团的吸水作用讨论了具有覆盆子状多壳层结构的微球的形成机理。通过微观观察、氮气吸附/脱附等温线、紫外-可见吸收光谱、X 射线衍射图谱和热重分析，研究了种子粒子中 4-乙烯基苯磺酸钠与苯乙烯的质量比（NaSS/St）、PVP 的浓度和[Ag（NH3）]离子对聚合物/Ag 纳米复合材料微球性能的影响。结果表明，通过控制种子溶胀聚合过程中种子粒子的 NaSS/St，可以简单方便地制备具有中空结构的覆盆子状多壳层微球。由于 PVP 的稳定和还原作用，以及磺酸基团与[Ag（NH3）]离子之间的吸引力，球形 AgNPs 被负载到聚合物微球上。在 NaBH4存在下，覆盆子状多壳层聚合物/Ag 微球对亚甲基蓝的降解表现出良好的催化活性和可重复使用性。
