A15, σ, and a Quasicrystal: Access to Complex Particle Packings via Bidisperse Diblock Copolymer Blends
A15, σ, and a Quasicrystal: Access to Complex Particle Packings via Bidisperse Diblock Copolymer Blends
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DOI：
10.1021/acsmacrolett.9b01026
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发表时间：
2020-02-01
影响因子：
7.015
通讯作者：
Bates, Frank S.
中科院分区：
文献类型：
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作者：
Lindsay, Aaron P.;Lewis, Ronald M., III;Bates, Frank S.
重新关注名义上的单组分、组成不对称的两嵌段共聚物的相行为，揭示了一系列以前没有预料到的Frank-Kasper(FK)和准晶相。然而，到目前为止，这些周期性和非周期性粒子填充只在低分子量、高度构象不对称的两嵌段共聚物中被报道，这给研究人员留下了一个相对较小的聚合物库来研究这些相。在这项工作中，我们报告了一种获得这些形态的简单方法：共混两种具有相同电晕嵌段长度和不同核心嵌段长度的两嵌段共聚物。将组成对称和不对称的等电晕嵌段长度的聚苯乙烯-b-1，4-聚丁二烯(SB)两嵌段共聚物共混在一起，通过小角X射线散射和透射电子显微镜观察到有序形成FKA15和Sigma相，以及十二方准晶，为高相对分子质量两嵌段共聚物熔体中的各种粒子堆积提供了途径。
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 sigma phases, as well as a dodecagonal quasicrystal, providing a route to various particle packings in high molecular weight diblock copolymer melts.