Reactive Surfactants for Polymeric Nanocapsules via Interfacially Confined Miniemulsion ATRP
Reactive Surfactants for Polymeric Nanocapsules via Interfacially Confined Miniemulsion ATRP
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DOI：
10.1021/ma901574y
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发表时间：
2009-11-10
期刊：
影响因子：
5.5
通讯作者：
Moller, Martin
中科院分区：
文献类型：
--
作者：
Li, Wenwen;Matyjaszewski, Krzysztof;Moller, Martin
以两亲性嵌段共聚物聚环氧乙烷-聚甲基丙烯酸丁酯（PEO-PBMA-Cl）为稳定剂/大分子引发剂，通过电子转移原子转移自由基聚合（AGET ATRP）产生的活化剂，在细乳液体系中，通过单乙烯基单体和二乙烯基交联剂的界面限制共聚反应，制备了具有交联壳层的稳定中空聚合物纳米胶囊。大分子引发剂的两亲性质确保聚合从水/单体液滴界面开始，聚合物链通过AGET引发的ATRP以受控方式向内缓慢生长。通过TEM、Cryo-SEM和AFM对所得颗粒进行表征提供了直接证据，证明成功制备了具有中空结构的纳米颗粒。通过在粒子壳层引入交联单元，提高了粒子的稳定性，使粒子易于再分散于一些常用的有机溶剂中。
Stable hollow polymeric nanocapsules with a cross-linked shell were prepared through an interfacially confined copolymerization of a monovinyl monomer and divinyl cross-linker via ail activator generated by election transfer atom transfer radical polymerization (AGET ATRP) in a miniemulsion system An amphiphilic block copolymer poly(ethylene oxide)-b-poly(n-butyl methacrylate) (PEO-PBMA-Cl) was used as a stabilizer/macroinitiator. The amphiphilic nature of the macroinitiator ensures that the polymerization starts from the aqueous/monomer droplet interface with polymer chains slowly growing inward in a controlled manner by an AGET initiated ATRP Characterization of the resulting particles by TEM, Cryo-SEM, and AFM provided direct evidence that nanoparticles with a hollow structure were successfully prepared. Introduction of cross-linking units to the shell of the particles improved the stability of the particles, which could be easily redispersed in some common organic solvents.