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Polyurethane networks based on disulfide bonds: from tunable multi-shape memory effects to simultaneous self-healing

基于二硫键的聚氨酯网络: 从可调多重形状记忆性能到同步修复

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Abstract

With the prompt development in intellectualization nowadays, the smart materials with multi-functionality or multi-responsiveness are highly expected. But it is a big challenge to integrate the different actuating units into a single system in a synergy pattern. Herein, we put forward a new strategy to develop the polyurethane networks which can present shape-memory effect and self-healing effect in independent way as well as simultaneous acting mode. To realize this goal, poly(tetremethylene ether) glycol was chosen as the soft segment to ensure the polymer chains a good mobility, and disulfide bond as the dynamic covalent bond was embedded in the backbone of polyurethane to endow it with desirable self-healing capacity under mild condition. Moreover, a rational control of the architecture of the networks by adjusting the content of disulfide bond and the degree of cross-linking, a broad glass transition temperature (Tg) was achieved, which enabled the network a versatile shape-memory effect, covering from dual-, triple- so far as to quadruple-shape memory effect. More importantly, the shape recovery and healing process can be realized simultaneously because of the highly matched actuating condition in this system.

摘要

随着智能化时代的迅速发展, 具有多功能或多响应的智能材料受到高度关注. 但如何将多个智能单元以协同模式结合到单一系统中仍是研究者面临的巨大挑战. 本文设计合成了一种新型聚氨酯动态交联网络, 该材料能够以独立的方式和协同作用模式呈现形状记忆效应和自修复效应. 为了实现这一目标, 本文选择了聚四氢呋喃作为软链段以确保聚合物链具有良好的运动性, 同时将动态共价键二硫键引入聚氨酯的主链中以实现材料在温和条件下的自修复. 此外, 通过有效调节二硫键含量、 交联度和网络结构, 获得了较宽的玻璃化转变温度(Tg), 使网络具有两重、 三重甚至四重形状的记忆效应. 在此基础上, 利用该材料的形状回复和修复的外界刺激条件的高度吻合, 同时实现了材料修复和回复, 拓宽了材料的应用范围.

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Acknowledgements

This work was supported financially by the National Natural Science Foundation of China (51773131 and 51721091), and the International S&T Cooperation Project of Sichuan Province (2017HH0034).

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Authors and Affiliations

  1. Center for Degradable and Flame-Retardant Polymeric Materials (ERCEPM-MoE), College of Chemistry, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610064, China

    Xiao-Ying Deng  (邓小莹), Hui Xie  (谢辉), Lan Du  (杜澜), Cheng-Jie Fan  (范诚杰), Chuan-Ying Cheng  (成川颖), Ke-Ke Yang  (杨科珂) & Yu-Zhong Wang  (王玉忠)

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  1. Xiao-Ying Deng  (邓小莹)
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  2. Hui Xie  (谢辉)
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  3. Lan Du  (杜澜)
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  4. Cheng-Jie Fan  (范诚杰)
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  6. Ke-Ke Yang  (杨科珂)
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Correspondence to Ke-Ke Yang  (杨科珂).

Additional information

Xiao-Ying Deng received her bachelor degree in applied chemistry from Southwest University in 2015. Now she is a Master candidate in polymer chemistry and physics under the supervision of Professor Ke-Ke Yang at Sichuan University. Her research interests are related to the preparation and properties of shape-memory or self-healing polymers.

Ke-Ke Yang received her BSc degree in polymer materials (1994), MSc degree in chemical fiber (1997), and PhD degree in material science from Sichuan University in China. She joined Sichuan University in 1997, and now is a full professor in polymer chemistry and physics. Her research is focused on biodegradable polymers, polymer composites, shape-memory polymers and self-healing materials.

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Deng, XY., Xie, H., Du, L. et al. Polyurethane networks based on disulfide bonds: from tunable multi-shape memory effects to simultaneous self-healing. Sci. China Mater. 62, 437–447 (2019). https://doi.org/10.1007/s40843-018-9318-7

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