A renewed focus on the phase behavior of nominally single-component, compositionally asymmetric diblock copolymers has revealed a host of previously unanticipated Frank–Kasper (FK) and quasicrystalline phases. However, these periodic and aperiodic particle packings have thus far only been reported in low molecular weight, highly conformationally asymmetric diblock copolymers, leaving researchers with a relatively small library of polymers in which these phases can be studied. In this work, we report on a simple approach to access these morphologies: blending two diblock copolymers with the same corona block length and varied core block lengths. Compositionally symmetric and asymmetric polystyrene-b-1,4-polybutadiene (SB) diblock copolymers with constant corona block lengths were blended together and shown via small-angle X-ray scattering and transmission electron microscopy to order into the FK A15 and σ phases, as well as a dodecagonal quasicrystal, providing a route to various particle packings in high molecular weight diblock copolymer melts.

中文翻译：

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A15、σ 和准晶体：通过双分散二嵌段共聚物共混物获得复杂颗粒填料

重新关注名义上单组分、组成不对称的二嵌段共聚物的相行为，揭示了许多以前未曾预料到的 Frank-Kasper (FK) 相和准晶相。然而，迄今为止，这些周期性和非周期性颗粒填料仅在低分子量、高度构象不对称的二嵌段共聚物中被报道，为研究人员留下了一个相对较小的聚合物库，可以在其中研究这些相。在这项工作中，我们报告了一种访问这些形态的简单方法：混合两种具有相同电晕嵌段长度和不同核心嵌段长度的二嵌段共聚物。组成对称和不对称的聚苯乙烯- b将具有恒定电晕嵌段长度的-1,4-聚丁二烯 (SB) 二嵌段共聚物共混在一起，并通过小角度 X 射线散射和透射电子显微镜显示以有序进入 FK A15 和 σ 相以及十二方准晶，为高分子量二嵌段共聚物熔体中的各种颗粒填料提供了一条途径。