A Composite Elastomer with Photo-responsive Shape Memory and Programmable Hygroscopic Actuation Functionalities

Xiang-Xi Cui ¹Li Shang ¹Zhong-Wen Liu ¹Zhao-Tie Liu ¹Jin-Qiang Jiang ¹Guo Li¹

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作者信息

1. Key Laboratory of Syngas Conversion of Shaanxi Province,School of Chemistry and Chemical Engineering,Shaanxi Normal University,Xi'an 710062,China
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Abstract

Developing hydroscopic actuators with simultaneous high elasticity,shape programmability and tunable actuating behaviors are highly desired but still challenging.In this study,we propose an orthogonal composite design to develop such a material.The developed com-posite elastomer comprises carboxyl group-grafted polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene(SEBS-g-COOH)as the elas-tic substrate,and a synthesized azobenzene derivative as the functional filler(Azo12).By surface treatment using acidic and base solutions,the carboxyl groups on the surface can reversibly transform into carboxylate groups,which render the composite tunable hygroscopic actuating functionality.On another aspect,the added filler undergoes trans-to-cis isomerization when exposed to UV light irradiation,leading to liquefac-tion of the crystalline aggregates formed by Azo12 molecules.The liquefied Azo12 molecules can autonomously resotre their trans form and re-form the crystalline structure.This reversible change in crystralline structure is utilized to realize the shape memory property,and 5 wt％of Azo12 addition is adequate for the composite to exhibit photo-responsive shape memory behavior without compromising much of the elasricity.The regualtion of external geometry by shape memory effect is effective in altering the actuating behavior.The proposed method can be extend to designing different composites with the demonstrated functionalities.

Key words

Actuator/Shape memory/Photo-responsive/Hygroscopic responsive/Azobenzene

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基金项目

National Natural Science Foundation of China(51803115)

National Natural Science Foundation of China(21636006)

Fundamental Research Funds for the Central Universities(GK201901001)

Fundamental Research Funds for the Central Universities(2021CSLY008)

Fundamental Research Funds for the Central Universities(2021CSZL003)

Fundamental Research Funds for the Central Universities(GK202103032)

Innovation Capability Support Program of Shaanxi(2020TD-024)

出版年

2024

高分子科学(英文版)

中国化学会　中国科学院化学研究所

高分子科学(英文版)

CSTPCDCSCD

影响因子：0.721

ISSN：0256-7679

参考文献量30

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