Nonclassical Spherical Packing Phases Self-Assembled from AB-Type Block Copolymers.
Nonclassical Spherical Packing Phases Self-Assembled from AB-Type Block Copolymers.
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DOI：
10.1021/acsmacrolett.7b00756
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发表时间：
2017-10
影响因子：
5.8
通讯作者：
Weihua Li;Chao Duan;A. Shi
中科院分区：
文献类型：
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作者：
Weihua Li;Chao Duan;A. Shi
在由嵌段共聚物自组装的各种有序形态中，球形堆积相特别有趣，因为它们类似于熟悉的原子晶体。嵌段共聚物常见的球形形态是体心立方相。最近，在嵌段共聚物熔体中观察到了许多新颖的球形堆积相，即最初在金属合金中获得的复杂 Frank-Kasper 相。理论研究表明，不同嵌段的构象不对称性提供了稳定 Frank-Kasper 相的关键机制。此外，二嵌段共聚物和共聚物结构的共混物中不同共聚物的局部偏析提供了增强复杂有序相稳定性的额外机制。在本观点中，我们总结了我们对 AB 型嵌段共聚物中非经典球形堆积相形成的理解的最新进展，强调了这些令人着迷的复杂有序结构的形成机制。
Among the various ordered morphologies self-assembled from block copolymers, the spherical packing phases are particularly interesting because they resemble the familiar atomic crystals. The commonly observed spherical morphology of block copolymers is the body-centered-cubic phase. Recently, a number of novel spherical packing phases, i.e., the complex Frank-Kasper phases originally obtained in metallic alloys, have been observed in block copolymer melts. Theoretical studies have revealed that conformational asymmetry of the different blocks provides a key mechanism to stabilize the Frank-Kasper phases. Furthermore, local segregation of different copolymers in blends of diblock copolymers and copolymer architectures provides additional mechanisms to enhance the stability of the complex ordered phases. In this Viewpoint we summarize recent advances in our understanding of the formation of the nonclassical spherical packing phases in AB-type block copolymers, emphasizing the formation mechanisms of these fascinating complex ordered structures.