嵌段共聚物聚苯乙烯-b-聚4-乙烯吡啶（PS-b-P4VP）在酸水（pH=2）中自组装形成PS为核,P4VP为壳的核-壳胶束（约为30 nm）。在核-壳胶束酸水溶液（pH=2）中加入氯化钯,钯离子与P4VP络合形成聚苯乙烯为核、聚4-乙烯吡啶/钯离子为壳的胶束。进一步加入硼氢化钠（NaBH4）原位还原钯离子,得到钯纳米粒子（粒径约为3 nm）位于P4VP壳层的复合胶束。复合胶束对4-硝基苯酚还原为4-氨基苯酚的反应中表现出催化活性,动力学研究结果表明,反应为一级反应,反应速率随复合胶束浓度的增加及反应温度的升高而加快。
Block copolymers,polystyrene block poly（4-vinyl pyridine）（PS-b-P4VP）,self-assembled into core-shell micelles with PS as the core and P4VP as the shell in acidic water（pH=2）.The PdCl2 was added to the core-shell micelles solution and the ionic Pd2＋ then complexes with P4VP chains to form micelles with PS as the core and P4VP/Pd2＋ as the shell.The complex micelles containing Palladium nanoparticles in the P4VP surfaces of the micelles were obtained by in-situ reducing the Pd2＋ of the micelles in acidic water（pH=2） using NaBH4 as the reductant.The complex micelles can be applied to catalyze the reduction of 4-nitrophenol into 4-aminothenol and the reaction shows one-order kinetics,furthermore,the reactive rate increases with increasing concentration of micelles and reactive temperature.
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