聚苯乙烯-b-聚氧乙烯-b-聚苯乙烯三嵌段共聚物的自组装

小分子表面活性剂、磷脂、接枝及嵌段共聚物等两亲分子在选择性介质中能够自组装形成特定的分子聚集体 [1,2 ] .嵌段共聚物自组装的某些行为具有生物膜模拟性 ,如最近发现的嵌段共聚物自组装囊泡 [3～ 5] .诸多因素影响着嵌段共聚物在稀溶液中的自组装行为 [6] .对于 ABA型三嵌

Self-assembly of Polystyrene-b-poly(ethylene oxide)-b-polystyrene Triblock Copolymer

In this paper, the self-assembly of PS 43-b-PEO 45-b-PS 43 triblcok copolymer was investigated. The colloids were made by firstly dissolving the copolymer in the common solvents, including THF, 1,4-dioxane, and DMF, then droping water into the corresponding copolymer solution to induce the self-assembly. The aggregates prepared were characterized with TEM and AFM techniques. The experimental results demonstrated that the self-assembled vesicles were formed when THF and 1,4-dioxane were used as the common solvents to dissolve the copolymer, comparatively, using DMF as the common solvent resulted in the formation of spherical aggregates. The self-assembled aggregates observed, possessing hierarchical structures, could be used as either the nanostructures themselves for drug delivery systems, separations, catalysts, and so on, or templates or building blocks for more complex structures.