Natural sunlight-actuated shape memory materials with reversible shape change and self-healing abilities based on carbon nanotubes filled conductive polymer composites
Natural sunlight-actuated shape memory materials with reversible shape change and self-healing abilities based on carbon nanotubes filled conductive polymer composites
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基于碳纳米管填充导电聚合物复合材料的具有可逆形状变化和自修复能力的天然阳光驱动形状记忆材料
DOI：
10.1016/j.cej.2019.122823
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发表时间：
2020-02-15
影响因子：
15.1
通讯作者：
Jiang, Wei
中科院分区：
文献类型：
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作者：
Cui, Xihua;Chen, Jianwen;Jiang, Wei
光响应形状记忆材料（SMMs）是一种利用方便的光能驱动材料形状变化的智能材料。虽然自然阳光是地球上取之不尽的清洁能源，但由于阳光是一种相对较弱的能源，利用阳光来触发smm的形状变化仍然是一个挑战。本文以碳纳米管/氯化聚碳酸丙烯酯复合材料为基础，采用易熔体共混制备了一种具有自愈能力的天然阳光驱动smm。观察到复合材料具有优异的形状记忆性能，不仅可以在红外光下触发，而且可以在阳光下触发。对于200%应变的预拉伸复合材料，在红外光下形状恢复时产生的收缩力为2.6 +/- 0.2 N，可提起自重的550倍。此外，板材复合材料（厚度为0.2 mm）在自然光照射下的最短形状恢复时间仅为39 s。随后，将复合纸双层膜构建并组装成一朵人工花。有趣的是，这种花可以在阳光下开放，在遮挡阳光后闭合，这与自然界中的亲日花相似。此外，发现复合材料薄片上的切口在红外照射下可以快速愈合，表现出光致自愈行为。我们希望这项工作可以激发新的想法，并启发未来自然阳光驱动的smm和器件的发展。
Light-responsive shape memory materials (SMMs) are a type of smart materials which utilize the convenient light energy to actuate shape changes of the materials. Although natural sunlight is the unlimited and clean energy on the earth, it is still a challenge to use sunlight to trigger shape changes of SMMs because sunlight is a relatively weak energy source. Herein, a type of natural sunlight-actuated SMMs with self-healing ability based on the carbon nanotubes/chlorinated poly(propylene carbonate) composites is fabricated by the facile melt blending. It is observed that the composites exhibit excellent shape memory properties, which can be triggered not only by IR light but also by sunlight. For pre-stretched composites with 200% strain, the contraction force produced during shape recovery under IR light is 2.6 +/- 0.2 N, which can lift 550 times their own weight. In addition, the shortest shape recovery time of the sheet composites (a thickness of 0.2 mm) under natural sunlight is only 39 s. Subsequently, the composite-paper bilayer films are constructed and assembled into an artificial flower. It is interesting to note that this flower can open under sunlight and close after blocking the sunlight, which is similar to the heliophile flowers in nature. Moreover, it is found that the incision on the composite sheet can be fast healed under infrared irradiation, which exhibits light-actuated self-healing behavior. We hope that this work may stimulate new ideas and inspire in the development of natural sunlight-actuated SMMs and devices in future.