Controlling Self-Assembly in Gyroid Terpolymer Films By Solvent Vapor Annealing
Controlling Self-Assembly in Gyroid Terpolymer Films By Solvent Vapor Annealing
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DOI：
10.1002/smll.201802401
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发表时间：
2018-11-15
期刊：
影响因子：
13.3
通讯作者：
Gunkel, Ilja
中科院分区：
文献类型：
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作者：
Dolan, James A.;Korzeb, Karolina;Gunkel, Ilja
溶剂蒸气退火（SVA）可以控制嵌段共聚物自组装的功效迄今已被证明主要是最简单的一类共聚物，线性二嵌段共聚物。添加第三个不同的块，从而创建一个三嵌段三元共聚物，不仅提供了方便的访问复杂的连续网络形态，特别是螺旋相，但也开辟了一条路线，朝着制造新的纳米器件，如光学超材料。然而，这样的应用程序，需要生成有序的三维连续网络，这反过来又需要详细了解的SVA过程中的连续网络形态。在这里，在原位掠入射小角度X射线散射（GISAXS）研究自组装的陀螺形成的三嵌段聚合物在SVA，揭示了几个关键的SVA参数的影响的形态，横向顺序，特别是，它的保存在干膜。螺旋体形态的鲁棒性是成功SVA的关键要求，允许探索退火参数，其可以使得能够产生具有长程有序的膜，例如，用于光学超材料应用。
The efficacy with which solvent vapor annealing (SVA) can control block copolymer self-assembly has so far been demonstrated primarily for the simplest class of copolymer, the linear diblock copolymer. Adding a third distinct block-thereby creating a triblock terpolymer-not only provides convenient access to complex continuous network morphologies, particularly the gyroid phases, but also opens up a route toward the fabrication of novel nanoscale devices such as optical metamaterials. Such applications, however, require the generation of well-ordered 3D continuous networks, which in turn requires a detailed understanding of the SVA process in terpolymer network morphologies. Here, in situ grazing-incidence small-angle X-ray scattering (GISAXS) is employed to study the self-assembly of a gyroid-forming triblock terpolymer during SVA, revealing the effects of several key SVA parameters on the morphology, lateral order, and, in particular, its preservation in the dried film. The robustness of the terpolymer gyroid morphology is a key requirement for successful SVA, allowing the exploration of annealing parameters which may enable the generation of films with long-range order, e.g., for optical metamaterial applications.