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

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

Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164

Corresponding author: Rong Yang, cloudyyang@cczu.edu.cn Jin-chun Li, lijinchun88@163.com
Received Date: 29 September 2019
Revised Date: 23 October 2019

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), 4,4'-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 (¹H-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 (T_g) around room temperature. With increasing BHHAB monomer, the T_g 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 T_g and π-π stacking interaction. While being crosslinked with HDI, the T_g 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.
- Azobenzene,
- Photoresponse,
- Liquid crystal,
- Postcrosslinking
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