Double Gyroid Morphologies in Precise Ion-Containing Multiblock Copolymers Synthesized via Step-Growth Polymerization.
Double Gyroid Morphologies in Precise Ion-Containing Multiblock Copolymers Synthesized via Step-Growth Polymerization.
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DOI：
10.1021/jacsau.2c00254
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发表时间：
2022-08-22
期刊：
影响因子：
8
通讯作者：
Winey, Karen I
中科院分区：
文献类型：
--
作者：
Park, Jinseok;Winey, Karen I
大约30年前，双螺旋结构首次在二嵌段共聚物中报道，并且这种形态相对于嵌段共聚物中其他有序形态的复杂性继续吸引软物质社区。双螺旋微相分离形态具有两种物质的共连续域，并且少数相被细分为两个互穿网络结构。除了二嵌段共聚物之外，这种结构已经在类似的体系中报道，包括与一种或两种均聚物共混的二嵌段共聚物和ABA型三嵌段共聚物。考虑到通常观察到双螺旋结构的窄组成区域（约3vol%），阴离子聚合已经主导了嵌段共聚物的合成以控制它们的组成和分子量。这一观点将突出最近的研究，（1）采用另一种聚合方法，使嵌段共聚物和（2）报告双螺旋结构的晶格参数低于10 nm。具体而言，逐步增长聚合连接精确的聚乙烯嵌段和短的含磺酸盐的嵌段以形成严格交替的多嵌段共聚物，并且这些共聚物在显著更宽的组成范围内（>14体积%）产生双螺旋结构。这些新的（AB）n多嵌段共聚物自组装成双螺旋结构，具有特殊的控制聚合物结构和大的相互作用参数之间的块。这一观点提出了一个更广泛和合成更容易获得的聚合物自组装成双螺旋体和其他有序结构的标准，使这些显着的结构可以用来解决各种技术挑战。
The double gyroid structure was first reported in diblock copolymers about 30 years ago, and the complexity of this morphology relative to the other ordered morphologies in block copolymers continues to fascinate the soft matter community. The double gyroid microphase-separated morphology has co-continuous domains of both species, and the minority phase is subdivided into two interpenetrating network structures. In addition to diblock copolymers, this structure has been reported in similar systems including diblock copolymers blended with one or two homopolymers and ABA-type triblock copolymers. Given the narrow composition region over which the double gyroid structure is typically observed (∼3 vol %), anionic polymerization has dominated the synthesis of block copolymers to control their composition and molecular weight. This perspective will highlight recent studies that (1) employ an alternative polymerization method to make block copolymers and (2) report double gyroid structures with lattice parameters below 10 nm. Specifically, step-growth polymerization linked precise polyethylene blocks and short sulfonate-containing blocks to form strictly alternating multiblock copolymers, and these copolymers produce the double gyroid structure over a dramatically wider composition range (>14 vol %). These new (AB)n multiblock copolymers self-assemble into the double gyroid structure by having exceptional control over the polymer architecture and large interaction parameters between the blocks. This perspective proposes criteria for a broader and synthetically more accessible range of polymers that self-assemble into double gyroids and other ordered structures, so that these remarkable structures can be employed to solve a variety of technological challenges.