一种具有光响应形状记忆和可编程吸湿致动功能的复合弹性体

IF 4.1 2区 化学 Q2 POLYMER SCIENCE Chinese Journal of Polymer Science Pub Date : 2024-09-02 DOI:10.1007/s10118-024-3187-4
Xiang-Xi Cui, Li Shang, Zhong-Wen Liu, Zhao-Tie Liu, Jin-Qiang Jiang, Guo Li
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引用次数: 0

摘要

开发同时具有高弹性、形状可编程性和可调致动器行为的吸水致动器是非常有必要的,但仍然具有挑战性。在本研究中,我们提出了一种正交复合设计来开发这种材料。所开发的复合弹性体由羧基接枝的聚苯乙烯-块状-聚(乙烯-共丁烯)-块状-聚苯乙烯(SEBS-g-COOH)作为弹性基材,合成的偶氮苯衍生物作为功能填料(Azo12)。通过使用酸性和碱性溶液进行表面处理,表面的羧基可以可逆地转化为羧酸基,从而使复合材料具有可调的吸湿致动功能。另一方面,添加的填料在紫外线照射下会发生反式-顺式异构化,导致 Azo12 分子形成的结晶聚集体液化。液化后的偶氮 12 分子可自主恢复反式形态,重新形成晶体结构。这种晶体结构的可逆变化被用来实现形状记忆特性,5 wt% 的 Azo12 添加量足以使复合材料表现出光响应形状记忆行为,而不会影响很大的弹性。利用形状记忆效应调节外部几何形状可有效改变致动行为。所提出的方法可扩展到设计具有所展示功能的不同复合材料。
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A Composite Elastomer with Photo-responsive Shape Memory and Programmable Hygroscopic Actuation Functionalities

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-co-butylene)-block-polystyrene (SEBS-g-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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来源期刊
Chinese Journal of Polymer Science
Chinese Journal of Polymer Science 化学-高分子科学
CiteScore
7.10
自引率
11.60%
发文量
218
审稿时长
6.0 months
期刊介绍: Chinese Journal of Polymer Science (CJPS) is a monthly journal published in English and sponsored by the Chinese Chemical Society and the Institute of Chemistry, Chinese Academy of Sciences. CJPS is edited by a distinguished Editorial Board headed by Professor Qi-Feng Zhou and supported by an International Advisory Board in which many famous active polymer scientists all over the world are included. The journal was first published in 1983 under the title Polymer Communications and has the current name since 1985. CJPS is a peer-reviewed journal dedicated to the timely publication of original research ideas and results in the field of polymer science. The issues may carry regular papers, rapid communications and notes as well as feature articles. As a leading polymer journal in China published in English, CJPS reflects the new achievements obtained in various laboratories of China, CJPS also includes papers submitted by scientists of different countries and regions outside of China, reflecting the international nature of the journal.
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