Toroidal triblock copolymer assemblies
Toroidal triblock copolymer assemblies
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DOI：
10.1126/science.1102866
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发表时间：
2004-10-01
期刊：
影响因子：
56.9
通讯作者：
Wooley, KL
中科院分区：
文献类型：
--
作者：
Pochan, DJ;Chen, ZY;Wooley, KL
通过结合对带同电荷的生物聚合物的成束和嵌段共聚物胶束形成至关重要的稀溶液特性，形成了环形或环状超分子组装体的稳定相。环形胶束与经典圆柱胶束形成的关键是两亲性三嵌段共聚物的带负电的亲水性嵌段与带正电的二价有机抗衡离子的相互作用。这会产生圆柱形胶束的自吸引，从而导致环形结构的形成，这种机制类似于半柔性带电生物聚合物（例如 DNA）的环形捆绑。环形线圈可以被动力学捕获或化学交联。通过观察薄膜流延过程中动力学捕获的中间结构，可以深入了解环形结构的形成机制。
A stable phase of toroidal, or ringlike, supramolecular assemblies was formed by combining dilute solution characteristics critical for both bundling of like-charged biopolymers and block copolymer micelle formation. The key to toroid versus classic cylinder micelle formation is the interaction of the negatively charged hydrophilic block of an amphiphilic triblock copolymer with a positively charged divalent organic counterion. This produces a self-attraction of cylindrical micelles that leads to toroid formation, a mechanism akin to the toroidal bundling of semiflexible charged biopolymers such as DNA. The toroids can be kinetically trapped or chemically cross-linked. insight into the mechanism of toroid formation can be gained by observation of intermediate structures kinetically trapped during film casting.