Hierarchical Self-assembly of Mesogen-jacketed Liquid Crystalline Polymers with Side-chain Nanobuilding Blocks

Ping-ping Hou; Zhi-hao Shen; Xing-he Fan

doi:10.11777/j.issn1000-3304.2017.17042

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Hierarchical Self-assembly of Mesogen-jacketed Liquid Crystalline Polymers with Side-chain Nanobuilding Blocks

Feature Articles | 更新时间：2021-01-26

- Hierarchical Self-assembly of Mesogen-jacketed Liquid Crystalline Polymers with Side-chain Nanobuilding Blocks
- Acta Polymerica Sinica Issue 7, Pages: 1038-1046(2017)
- 作者机构：
  
  北京分子科学国家实验室高分子化学与物理教育部重点实验室软物质科学与工程中心北京大学化学与分子工程学院北京 100871
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.17042
  CLC：
- Published：2017-7，
  
  Received：8 March 2017，
  
  Revised：29 March 2017，
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Ping-ping Hou, Zhi-hao Shen, Xing-he Fan. Hierarchical Self-assembly of Mesogen-jacketed Liquid Crystalline Polymers with Side-chain Nanobuilding Blocks. [J]. Acta Polymerica Sinica (7):1038-1046(2017)
DOI：

Ping-ping Hou, Zhi-hao Shen, Xing-he Fan. Hierarchical Self-assembly of Mesogen-jacketed Liquid Crystalline Polymers with Side-chain Nanobuilding Blocks. [J]. Acta Polymerica Sinica (7):1038-1046(2017) DOI： 10.11777/j.issn1000-3304.2017.17042.

摘要

甲壳型液晶高分子可以呈现超分子柱或片层的链构象，因此可以作为超分子液晶基元形成多种液晶相态，如六方柱状相、柱状向列相、六方柱状向列相、近晶相等.将纳米构筑单元，如一维的二联苯、二维的苯并菲、三维的多面体低聚倍半硅氧烷（POSS）等，引入到甲壳型液晶高分子中，所得聚合物可以自组装形成在亚十纳米和近纳米尺度的多级有序结构.这些结构具有尺寸可控及单分散的优点，可望在有机光电、纳米多孔膜以及纳米光刻等领域有着广阔的应用前景.本文主要介绍了将二联苯、偶氮苯、棒状多苯结构、苯并菲和POSS基元引入到甲壳型液晶高分子中制备多级组装结构的相关工作.

Abstract

The conformation of a mesogen-jacketed liquid crystalline polymer (MJLCP) chain can be a supramolecular rod or sheet. Therefore

MJLCPs can serve as supramolecular mesogens to form various liquid crystalline (LC) phases

such as hexagonal columnar

columnar nematic

hexatic columnar nematic

and smectic phases. By introducing nanobuilding blocks such as one-dimensional biphenyl

two-dimensional triphenylene and three-dimensional polyhedral oligomeric silsesquioxane (POSS) into MJLCPs

the resultant polymers can self-assemble into hierarchical structures on the sub-10 nm and close-to-1 nm length scales

as proven by a combination of experimental techniques including differential scanning calorimetry

polarized light microscopy

wide-angle and small-angle X-ray scattering

and transmission electron microscopy. In general

polymers form hierarchical structures at low temperatures. With increasing temperature

the ordered structure of the nanobuilding blocks in the side chain becomes disordered first. When the temperature is further elevated

the nano-sized LC phase of the polymer as a whole will transform to another structure or become isotropic. For some polymers

a re-entrant isotropic phase exists at intermediate temperatures. Because the hierarchical structures of these polymers have the advantages of controllable sizes and monodispersity and LC polymers are capable of being aligned by external fields and forming large-scale ordered domains

such polymers have wide potential applications in organic opto-electronics

nanoporous membranes

nanolithography

and so on. This paper reviews research works on the design

synthesis

and hierarchical self-assembly of MJLCP-based homopolymers containing biphenyl

azobenzene

calamitic multi-benzene structure

triphenylene

and POSS units in the side chains.

关键词

甲壳型液晶高分子纳米构筑单元二联苯苯并菲多面体低聚倍半硅氧烷

Keywords

Mesogen-jacketed liquid crystalline polymerNanobuilding blockBiphenylTriphenylenePolyhedral oligomeric silsesquioxane (POSS)

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Related Institution

Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University

The Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University

Research Institute of Material Science, SINOPEC Beijing Research Institute of Chemical Industry

Beijing National Laboratory for Molecular Sciences,Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,College of Chemistry and Molecular Engineering,Peking University

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