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

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

doi:10.1007/s10118-024-3187-4

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

RESEARCH ARTICLE | Updated：2024-09-23

- A Composite Elastomer with Photo-responsive Shape Memory and Programmable Hygroscopic Actuation Functionalities
- Chinese Journal of Polymer Science Vol. 42, Issue 10, Pages: 1470-1478(2024)
- Affiliations：
  
  Key Laboratory of Syngas Conversion of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710062, China
- Author bio：
  
  jiangjq@snnu.edu.cn (J.Q.J.)
  liguo@snnu.edu.cn (G.L.)
- Funds：
- DOI：10.1007/s10118-024-3187-4
  CLC：
- Received：28 April 2024，
  
  Revised：2024-06-08，
  
  Accepted：10 June 2024，
  
  Online First：02 September 2024，
  
  Published：01 October 2024
- Accepted：
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Cui, X. X.; Shang, L.; Liu, Z. W.; Liu, Z. T.; Jiang, J. Q.; Li, G. A composite elastomer with photo-responsive shape memory and programmable hygroscopic actuation functionalities. Chinese J. Polym. Sci. 2024, 42, 1470–1478

Xiang-Xi Cui, Li Shang, Zhong-Wen Liu, et al. A Composite Elastomer with Photo-responsive Shape Memory and Programmable Hygroscopic Actuation Functionalities[J]. Chinese Journal of Polymer Science, 2024, 42(10): 1470-1478.
Cui, X. X.; Shang, L.; Liu, Z. W.; Liu, Z. T.; Jiang, J. Q.; Li, G. A composite elastomer with photo-responsive shape memory and programmable hygroscopic actuation functionalities. Chinese J. Polym. Sci. 2024, 42, 1470–1478 DOI： 10.1007/s10118-024-3187-4.

Xiang-Xi Cui, Li Shang, Zhong-Wen Liu, et al. A Composite Elastomer with Photo-responsive Shape Memory and Programmable Hygroscopic Actuation Functionalities[J]. Chinese Journal of Polymer Science, 2024, 42(10): 1470-1478. DOI： 10.1007/s10118-024-3187-4.

摘要

By incorporating photo-liquefiable crystalline azobenzene derivative into carboxyl group-grafted SEBS

the resulting composite exhibit orthogonally programmable geometry and moisture-responsive actuating behavior. This is realized by the photo-regulated reversible formation of azobenzene derivative crystalline domains and the gradient reversible conversion between carboxyl and carboxylate group.

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 composite elastomer comprises carboxyl group-grafted polystyrene-block-poly(ethylene-

-butylene)-block-polystyrene (SEBS-

-COOH) as the elastic 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 liquefaction of the crystalline aggregates formed by Azo12 molecules. The liquefied Azo12 molecules can autonomously resotre their trans form and reform 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.

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