writer：Xihua Cui, Jianwen Chen, Yutian Zhu, Wei Jiang
keywords：形状记忆聚合物复合材料, 导电聚合物复合材料, 自愈合, 碳纳米管, 光热效应
source：期刊
specific source：Chemical Engineering Journal, 2020, 382, 122823
Issue time：2020年

摘要：光响应形状记忆材料（SMMs）是利用便捷光能驱动材料形状变化的一类智能材料。虽然自然阳光是地球上无限且清洁的能源，但阳光作为相对较弱能源，利用阳光触发SMMs形状变化仍是挑战。本文通过简便熔融共混制备了基于碳纳米管/氯化聚碳酸丙烯酯复合材料的自然阳光驱动且具有自愈能力的SMMs。研究发现，该复合材料具有优异形状记忆性能，不仅可由红外光触发，还可由阳光触发。对于预拉伸200%应变的复合材料，红外光下形状恢复产生的收缩力为2.6±0.2 N，可举起自身重量550倍的重物；0.2 mm厚片状复合材料在自然阳光下的最短形状恢复时间仅39 s。随后构建了复合材料-纸双层膜并组装成人工花，有趣的是，该花可在阳光下开放、遮挡阳光后闭合，类似于自然界中的向阳花。此外，复合材料片上的切口可在红外照射下快速愈合，表现出光诱导自愈能力。

Abstract：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-induced self-healing ability.

论文链接：https://doi.org/10.1016/j.cej.2019.122823