Synthesis of Main-chain Azobenzene Liquid Crystalline Copolyester with Side Hydroxyl Group and Its Photoresponsive Behavior

Ya-ting Peng; Tao Wang; Hang Li; Rong Yang; Jin-chun Li

doi:10.11777/j.issn1000-3304.2019.19177

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Synthesis of Main-chain Azobenzene Liquid Crystalline Copolyester with Side Hydroxyl Group and Its Photoresponsive Behavior

更新时间：2021-01-26

- Synthesis of Main-chain Azobenzene Liquid Crystalline Copolyester with Side Hydroxyl Group and Its Photoresponsive Behavior
- Acta Polymerica Sinica Vol. 51, Issue 3, Pages: 267-276(2020)
- 作者机构：
  
  江苏省环境友好高分子材料重点实验室常州大学材料科学与工程学院江苏省光伏科学与工程协同创新中心　常州 213164
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2019.19177
  CLC：
- Published：2020-3，
  
  Published Online：3 December 2019，
  
  Received：29 September 2019，
  
  Revised：23 October 2019，
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Ya-ting Peng, Tao Wang, Hang Li, Rong Yang, Jin-chun Li. Synthesis of Main-chain Azobenzene Liquid Crystalline Copolyester with Side Hydroxyl Group and Its Photoresponsive Behavior. [J]. Acta Polymerica Sinica 51(3):267-276(2020)
DOI：

Ya-ting Peng, Tao Wang, Hang Li, Rong Yang, Jin-chun Li. Synthesis of Main-chain Azobenzene Liquid Crystalline Copolyester with Side Hydroxyl Group and Its Photoresponsive Behavior. [J]. Acta Polymerica Sinica 51(3):267-276(2020) DOI： 10.11777/j.issn1000-3304.2019.19177.

摘要

以4

4'-双(6-羟基己氧基)联苯(BHHBP)、4

4'-双(6-羟基己氧基)偶氮苯(BHHAB)为液晶基元，利用苹果酸二乙酯(DM)和苯基丁二酸(PSA)采用无规共聚，合成了侧基含羟基的偶氮苯液晶共聚酯(Az-LCP). 先在液晶态下拉伸取向，然后用六亚甲基二异氰酸酯(HDI)交联制备单畴取向偶氮苯液晶交联网络. 通过核磁共振氢谱(

H-NMR)、凝胶渗透色谱(GPC)测试，对合成的Az-LCP进行结构表征，通过示差扫描量热分析(DSC)、X射线衍射(XRD)、偏光光学显微镜(POM)等对其液晶相变行为进行表征，研究了偶氮苯含量、交联密度、薄膜厚度对其光致弯曲行为的影响. 结果表明，偶氮苯含量10%，交联12 h的Az-LCP1具有最佳的光致弯曲回复行为.

Abstract

A series of main-chain azobenzene liquid crystalline copolyesters containing side hydroxyl group (Az-LCP) were synthesized with 4

4'-bis(6-hydroxyhexyloxy)biphenyl (BHHBP)

4'-bis(6-hydroxyhexyloxy)azobenzene (BHHAB)

diethyl malate (DM) and phenyl succinic acid (PSA) by random copolymerization. Chemical structure of the Az-LCPs was characterized by proton nuclear magnetic resonance (

H-NMR) and gel permeation chromatography (GPC). And the phase transition behavior of the Az-LCPs was characterized by differential scanning calorimeter (DSC)

and X-ray diffraction (XRD). Az-LCPs showed a nematic phase with a glass transition temperature (

) around room temperature. With increasing BHHAB monomer

the

and nematic-isotropic transition temperature of Az-LCPs decreased from 25.6 °C and 96.4 °C to 19 °C and 88.2 °C

respectively

showing a

trans-cis

photoisomerization effect of Az-LCPs. Then monodomain azobenzene liquid crystalline networks (Az-LCNs) were prepared by uniaxial stretching at nematic phase first

postcrosslinking in the hexamethylene diisocyanate solution for 12 h. Moreover

the orientation degree decreased with increasing BHHAB monomer into Az-LCP due to the decreasing

and

stacking interaction. While being crosslinked with HDI

the

of Az-LCNs increased up to 40 °C

meanwhile

the nematic-isotropic phase transition became broad and almost disappeared as the BHHAB monomer increased. All the Az-LCNs showed a UV-light induced bending and vis-light induced unbending behavior at room temperature except Az-LCN4 which contains 50% BHHAB monomer. Crosslinking duration of Az-LCNs also exhibited an influence on the photoresponsive bending/unbending behavior. With increasing crosslinking duration

the bending angle increased first and then decreased. In addition

the maximum bending angle and photoresponsive speed of Az-LCNs decreased with increasing thickness of the Az-LCNs films. Az-LCP1 with 10% azobenzene content and cross-linking for 12 h exhibits excellent photoresponsive behavior with a high bending angle of 88° and the fastest photoresponsive speed.

关键词

偶氮苯光响应液晶后交联

Keywords

AzobenzenePhotoresponseLiquid crystalPostcrosslinking

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Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University

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