Creating Biomorphic Barbed and Branched Mesostructures in Solution through Block Copolymer Crystallization
Creating Biomorphic Barbed and Branched Mesostructures in Solution through Block Copolymer Crystallization
复制标题
通过嵌段共聚物结晶在溶液中创建生物形态的倒刺和支化介观结构
DOI：
10.1002/anie.201809605
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Winnik M.A.
中科院分区：
文献类型：
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作者：
Jia L.;Guerin G.;Lu Y.;Yu Q.;Manners I.;Winnik M.A.
分支和倒钩结构在自然界中很常见，但在由自下而上自组装形成的纳米级或中尺度物体中很少见。自然物体形态的关键特征，如各种类型的昆虫和针叶树树枝，是尽管它们相似，但没有两个单独的物体是完全相同的。在这里，我们报告了一系列聚（二茂铁基二甲基硅烷）-嵌段-聚异戊二烯（PFS-B-PI）二嵌段共聚物的自组装条件，产生具有生物形态形状的结构。所有这些聚合物在癸烷中产生具有结晶PFS核的长的均匀纤维状胶束。然而，将这些聚合物的浓缩THF溶液注入THF/癸烷混合物中，导致倒钩和支化的介观结构，其形状取决于混合溶剂的最终THF含量。有趣的是，从胶体生物形态结构的悬浮液中蒸发THF导致细长的纤维状结构。
Branched and barbed structures are common in nature but rare in nanoscale or mesoscale objects formed by bottom‐up self‐assembly. Key characteristics of the morphology of natural objects, such as various types of insects and conifer branches, is that despite their similarities no two individual objects are exactly the same. Here we report the self‐assembly conditions for a series of poly(ferrocenyldimethylsilane)‐block‐polyisoprene (PFS‐b‐PI) diblock copolymers that generate structures with biomorphic shapes. All of these polymers yield long uniform fiber‐like micelles with a crystalline PFS core in decane. Injection of a concentrated THF solution of these polymers into THF/decane mixtures, however, leads to barbed and branched mesostructures, with shapes that depend upon the final THF content of the mixed solvent. Interestingly, evaporation of the THF from suspensions of the colloidal biomorphic structures led to elongated fiber‐like structures.