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Abstract Intelligent materials derived from green and renewable bio‐based materials garner widespread attention recently. Herein, shape memory polyurethane composite (PUTA/Fe) with fast response to near‐infrared (NIR) light is successfully prepared by introducing Fe 3+ into the tannic acid‐based polyurethane (PUTA) matrix through coordination between Fe 3+ and tannic acid. The results show that the excellent NIR light response ability is due to the even distribution of Fe 3+ filler with good photo‐thermal conversion ability. With the increase of Fe 3+ content, the NIR light response shape recovery rate of PUTA/Fe composite films is significantly improved, and the shape recovery time is reduced from over 60 s to 40 s. In addition, the mechanical properties of PUTA/Fe composite film are also improved. Importantly, owing to the dynamic phenol–carbamate network within the polymer matrix, the PUTA/Fe composite film can reshape its permanent shape through topological rearrangement and show its good NIR light response shape memory performance. Therefore, PUTA/Fe composites with high content of bio‐based material (TA content of 15.1–19.4%) demonstrate the shape memory characteristics of fast response to NIR light; so, it will have great potential in the application of new intelligent materials including efficient and environmentally friendly smart photothermal responder.
Yong et al. (Tue,) studied this question.
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