Block copolymers having two or more polymer chains linked covalently have been extensively studied for various nanostructure fabrications. Highly symmetric body-centered cubic (bcc) packing lattice has been the only observed supramolecular spherical phase in compositionally asymmetric AB diblock copolymers for a long time. After 2010, the Frank−Kasper (F-K) σ (1) and A15 (2) phases featured by small volume asymmetry among constitutional supramolecular motifs have been discovered in some block copolymers, although with elaborately designed block conformation asymmetry or architectures. In PNAS, Cheong et al. (3) utilize the self-consistent field theory (SCFT) to demonstrate that thermodynamically stable F-K Laves phases with intrinsically large volume asymmetry can be realized by simply blending diblock copolymers with minority-block homopolymer in dry-brush mode. This rather convenient strategy potentially provides common block copolymer systems the access to those complex condensed phases with large volume asymmetry and upper length scale.

中文翻译：

---

由简单聚合物共混物制成的复杂自组装晶格。


具有两个或更多个共价连接的聚合物链的嵌段共聚物已被广泛研究用于各种纳米结构制造。长期以来，高度对称的体心立方（bcc）堆积晶格一直是组成不对称的AB二嵌段共聚物中唯一观察到的超分子球形相。 2010年之后，在一些嵌段共聚物中发现了以构成超分子基序之间小体积不对称为特征的Frank−Kasper (FK) σ ( 1 )和A15 ( 2 )相，尽管它们具有精心设计的嵌段构象不对称或结构。在 PNAS 中，Cheong 等人。 ( 3 )利用自洽场论(SCFT)证明，通过简单地将二嵌段共聚物与少数嵌段均聚物在干刷模式下共混，可以实现具有本质上大体积不对称性的热力学稳定的FK Laves相。这种相当方便的策略可能为常见的嵌段共聚物系统提供获得具有大体积不对称性和较高长度尺度的复杂凝聚相的途径。