Reversible photo-responsive gel-sol transitions of robust organogels based on an azobenzene-containing main-chain liquid crystalline polymer

Wang Jing; Jiang Qian; Hao Xingtian; Yan Hongchao; Peng Haiyan; Xiong Bijin; Liao Yonggui; Xie Xiaolin

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Reversible photo-responsive gel-sol transitions of robust organogels based on an azobenzene-containing main-chain liquid crystalline polymer

机译：基于含偶氮苯的主链液晶聚合物的可逆照片响应凝固凝胶溶胶转变

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Stimuli-responsive supramolecular gels have been widely investigated, but the construction of a liquid crystalline gel with a high mechanical property and reversible photo-response still remains a challenge. This is due to the difficulty of designing gelators with liquid crystal properties and gelation abilities in organic solvents simultaneously. In this study, an azobenzene-containing main-chain polyester (Azo-mLCP) with a pendant amide group was synthesized. The organogel of Azo-mLCP via a hydrogen bond in dioxane possessed reversible thermal- and photo-responsive behaviours. The organogel exhibited a good self-supporting ability when the concentration of the gelator was more than 7.5 wt%. The rapid trans-to-cis isomerization of Azo-mLCP in solution was studied via UV-Vis absorption spectra. In addition, the gel-to-sol transition of the organogel could be triggered efficiently by an incomplete trans-to-cis conversion strategy. This study opens a way for the main-chain liquid crystalline polymers to serve in potential applications in photo-responsive robust actuators, electro-optical devices, and so on.

机译：刺激响应的超分子凝胶已被广泛研究，但液晶凝胶的构建具有高机械性能和可逆照片 - 反应仍然是一个挑战。这是由于难以在有机溶剂中设计具有液晶性质的凝胶器和同时的凝胶化能力。在该研究中，合成了含有悬浮酰胺基团的含偶氮苯的主链聚酯（AZO-MLCP）。通过二恶烷氢键的偶氮MLCP的有机凝胶具有可逆的热和光响应行为。当凝胶剂的浓度大于7.5wt％时，有机凝胶表现出良好的自支撑能力。通过UV-Vis吸收光谱研究了溶液中偶氮-MlCP的快速转孔异构化。此外，可以通过不完全的转换转换策略有效地触发有机凝胶的凝胶到溶胶转变。该研究为主链液晶聚合物开辟了一种用于光响应稳健致动器，电光装置等的潜在应用的方法。

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《RSC Advances》 |2020年第7期|共8页
作者
Wang Jing; Jiang Qian; Hao Xingtian; Yan Hongchao; Peng Haiyan; Xiong Bijin; Liao Yonggui; Xie Xiaolin;
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作者单位

Huazhong Univ Sci &

Technol Key Lab Mat Chem Energy Convers &

Storage Hubei Key Lab Mat Chem &

Serv Failure Sch Chem &

Chem Engn Minist Educ Wuhan 430074 Peoples R China;

Huazhong Univ Sci &

Technol Key Lab Mat Chem Energy Convers &

Storage Hubei Key Lab Mat Chem &

Serv Failure Sch Chem &

Chem Engn Minist Educ Wuhan 430074 Peoples R China;

Huazhong Univ Sci &

Technol Key Lab Mat Chem Energy Convers &

Storage Hubei Key Lab Mat Chem &

Serv Failure Sch Chem &

Chem Engn Minist Educ Wuhan 430074 Peoples R China;

Huazhong Univ Sci &

Technol Key Lab Mat Chem Energy Convers &

Storage Hubei Key Lab Mat Chem &

Serv Failure Sch Chem &

Chem Engn Minist Educ Wuhan 430074 Peoples R China;

Huazhong Univ Sci &

Technol Key Lab Mat Chem Energy Convers &

Storage Hubei Key Lab Mat Chem &

Serv Failure Sch Chem &

Chem Engn Minist Educ Wuhan 430074 Peoples R China;

Huazhong Univ Sci &

Technol Key Lab Mat Chem Energy Convers &

Storage Hubei Key Lab Mat Chem &

Serv Failure Sch Chem &

Chem Engn Minist Educ Wuhan 430074 Peoples R China;

Huazhong Univ Sci &

Technol Key Lab Mat Chem Energy Convers &

Storage Hubei Key Lab Mat Chem &

Serv Failure Sch Chem &

Chem Engn Minist Educ Wuhan 430074 Peoples R China;

Huazhong Univ Sci &

Technol Key Lab Mat Chem Energy Convers &

Storage Hubei Key Lab Mat Chem &

Serv Failure Sch Chem &

Chem Engn Minist Educ Wuhan 430074 Peoples R China;

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1. Reversible photo-responsive gel-sol transitions of robust organogels based on an azobenzene-containing main-chain liquid crystalline polymer [J] . Wang Jing, Jiang Qian, Hao Xingtian, RSC Advances . 2020,第7期

机译：基于含偶氮苯的主链液晶聚合物的可逆照片响应凝固凝胶溶胶转变
2. Thermal and photo reversible gel-sol transition of azobenzene based liquid crystalline organogel [J] . Subramanian Balamurugan, Guan-Yeow Yeap, Wan Ahmad Kamil Mahmood Journal of Photochemistry and Photobiology, A. Chemistry . 2014,第Null期

机译：偶氮苯基液晶有机凝胶的热和光可逆凝胶-溶胶转变
3. Liquid-crystalline azobenzene-containing ferrocene-based polymers: study on synthesis and properties of main-chain ferrocene-based polyesters with azobenzene in the side chain [J] . Wael A. Amer, Li Wang, Abid M. Amin, Polymers for advanced technologies . 2013,第2期

机译：液晶含偶氮苯的二茂铁基聚合物：侧链含偶氮苯的主链二茂铁基聚酯的合成与性能研究
4. MAIN-CHAIN/SIDE-CHAIN LIQUID CRYSTALLINE POLYMER WITH THE MAIN-CHAIN BASED ON "JACKETING" CONCEPT [C] . Er-Qiang Chen, He-Lou Xie, Hai-Liang Zhang, International symposium on polymer chemistry : Preprints. . 2010

机译：主链/侧链液态结晶聚合物，基于“顶管”概念
5. Characterization of a series of azobenzene-containing liquid crystalline methacrylate polymers and their thermochromic properties. [D] . Freiberg, Stephan Marc. 2003

机译：一系列含偶氮苯的液晶甲基丙烯酸酯聚合物的表征及其热致变色性能。
6. Temperature-induced reversible self-assembly of diphenylalanine peptide and the structural transition from organogel to crystalline nanowires [O] . Renliang Huang, Yuefei Wang, Wei Qi, 2014

机译：温度诱导的二苯丙氨酸肽的可逆自组装以及从有机凝胶到结晶纳米线的结构转变
7. Reversible photo-responsive gel–sol transitions of robust organogels based on an azobenzene-containing main-chain liquid crystalline polymer [O] . Jing Wang, Qian Jiang, Xingtian Hao, 2020

机译：基于含偶氮苯的主链液晶聚合物的可逆照片响应凝固凝胶溶胶转变
8. Liquid Crystalline Polymers Containing Mesogenic Units Based on Half-Disc and Rod-Like Moieties. 5. Side Chain Liquid Crystalline Polymethylsiloxanes Containing Hemiphasmidic Mesogens Based on 4-(3,4,5-Tris(alkan-1-yloxy)benzoyloxy)-4-(p-(propan-l- yloxy)benzoyloxy)biphenyl Groups. [R] . Percec, V., Heck, J., Ungar, G. 1991

机译：含有基于半圆盘和棒状部分的介晶单元的液晶聚合物。 5.含有半亚胺基中间体的侧链液晶聚甲基硅氧烷基于4-（3,4,5-三（链烷-1-基氧基）苯甲酰氧基）-4-（对 - （丙-1-基氧基）苯甲酰氧基）联苯基。

Reversible photo-responsive gel-sol transitions of robust organogels based on an azobenzene-containing main-chain liquid crystalline polymer

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