应用化学 ›› 2024, Vol. 41 ›› Issue (8): 1107-1115.DOI: 10.19894/j.issn.1000-0518.240047

• 研究论文 • 上一篇    下一篇

嵌段共聚物Single plumber′s nightmare网络结构的动力学构筑方案

李鸿1,2, 孙德文1,2()   

  1. 1.中国科学院长春应用化学研究所,高分子物理与化学国家重点实验室,长春 130022
    2.中国科学技术大学应用化学与工程学院,合肥 230026
  • 收稿日期:2024-02-06 接受日期:2024-06-16 出版日期:2024-08-01 发布日期:2024-08-27
  • 通讯作者: 孙德文
  • 基金资助:
    国家自然科学基金(21973090)

Kinetic Fabrication Strategy of Single Plumber′s Nightmare Network Mesostructure of Block Copolymers

Hong LI1,2, De-Wen SUN1,2()   

  1. 1.State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    2.School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei 230026,China
  • Received:2024-02-06 Accepted:2024-06-16 Published:2024-08-01 Online:2024-08-27
  • Contact: De-Wen SUN
  • About author:dwsun@ciac.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(21973090)

摘要:

嵌段共聚物通过自组装行为在纳米尺度上形成的三维网络状有序结构在许多领域均具有非常重要的潜在应用价值,受到了高性能材料科学领域研究人员的广泛关注,尤其是其中的单螺旋(Single gyroid)网络状有序结构、单金刚石(Single diamond)网络状有序结构和Single plumber′s nightmare(SPN)网络状有序结构,一直是三维光子晶体研究领域关注的热点之一。虽然采用调节链拓扑结构、共混和多组分等方法在嵌段共聚物体系中发现了前2种网络状有序结构的稳定相区,但是对于SPN网络状有序结构,目前还尚未找到有效的办法来稳定该网络状有序结构。有鉴于此,通过设计B1A1B2A2C3B3、B1A1B2A2C3、B1A1C2B2A2C3、B1A1C2A2C3和B1C1A1C2A2C3快速组分变化线形多嵌段共聚物体系,并基于稳定的简单立方堆积球状有序结构利用C嵌段组分由B组分到A组分的快速转变构造不稳定状态,研究了从这些不稳定状态出发的非平衡态结构演化动力学过程及其机理以及C嵌段位置、数目和长度的影响。研究发现,在C嵌段的组分发生快速转变之后,相应的非平衡态结构演化动力学过程可以在较为宽广的A组分体积分数范围内最终到达亚稳定的SPN网络状有序结构,这可能主要是由于简单立方堆积球状有序结构的对称性与SPN网络状有序结构的对称性均属于第221号空间群。

关键词: 嵌段共聚物, 球状有序结构, 网络状有序结构, 快速组分变化, 非平衡态自组装行为

Abstract:

The ordered mesostructures formed by block copolymers on the nanoscale via the self-assembly have attracted a lot of attention of high-performance material science due to its important, potential applications, especially the single gyroid network, single diamond network, and the single plumber′s nightmare (SPN) network. These three networks are very important in the fields of three-dimensional photonic crystals. Whereas single gyroid and single diamond have been stabilized in block copolymers by adjusting the chain architectures, blending, and using multicomponent systems, so far, no effective way has been found to stabilize the SPN network. Considering such situations, by designing B1A1B2A2C3B3, B1A1B2A2C3, B1A1C2B2A2C3, B1A1C2A2C3, and B1C1A1C2A2C3 multiblock copolymers and based on the simple cubic spheres to generate the unstable states via the rapid-component change of blocks, C, from B to A, the nonequilibrium kinetics of structural evolution starting from these unstable states and the corresponding mechanism as well as the effects from the number, position, and size of blocks, C, are explored. The exploration indicates that the metastable SPN network can be reached by the nonequilibrium kinetics of structural evolution after the rapid-component change of blocks, C, within a relatively wide range of volume-fraction A, which is mainly because that the symmetry of simple cubic spheres is the same as that of SPN (No.221 space group).

Key words: Block copolymer, Spherical mesostructure, Network mesostructure, Alchemical transformation, Nonequilibrium self-assembly

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