侧基含纳米构筑单元的甲壳型液晶高分子的多层次自组装

候平平; 沈志豪; 范星河

doi:10.11777/j.issn1000-3304.2017.17042

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侧基含纳米构筑单元的甲壳型液晶高分子的多层次自组装

专论 | 更新时间：2021-01-26

- 侧基含纳米构筑单元的甲壳型液晶高分子的多层次自组装
- Hierarchical Self-assembly of Mesogen-jacketed Liquid Crystalline Polymers with Side-chain Nanobuilding Blocks
- 高分子学报 2017年第7期页码：1038-1046
- 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：
  
  [ "沈志豪, 男, 1972年9月生.北京大学化学与分子工程学院副教授, 博士生导师.1991年至1994年就读于南京大学强化部, 获学士学位; 1996年至2001年在美国阿克伦大学高分子科学系并获博士学位(导师:程正迪教授).2001至2007年先后在美国弗吉尼亚联邦大学及工业界进行博士后研究.2007年10月进入北京大学化学与分子工程学院高分子科学与工程系, 任副教授.主要研究兴趣为形状两性分子、液晶高分子以及液晶嵌段共聚物的自组装结构调控和功能化" ]
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.17042
  中图分类号：
- 纸质出版日期：2017-7，
  
  收稿日期：2017-3-8，
  
  修回日期：2017-3-29，
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候平平, 沈志豪, 范星河. 侧基含纳米构筑单元的甲壳型液晶高分子的多层次自组装[J]. 高分子学报, 2017,(7):1038-1046.

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, 2017,(7):1038-1046.
候平平, 沈志豪, 范星河. 侧基含纳米构筑单元的甲壳型液晶高分子的多层次自组装[J]. 高分子学报, 2017,(7):1038-1046. DOI： 10.11777/j.issn1000-3304.2017.17042.

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, 2017,(7):1038-1046. 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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