Affiliation:
1. College of Biomass Science and Engineering Sichuan University Chengdu 610065 China
2. Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan University Chengdu 610065 China
Abstract
AbstractIntelligent 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 Fe3+ into the tannic acid‐based polyurethane (PUTA) matrix through coordination between Fe3+ and tannic acid. The results show that the excellent NIR light response ability is due to the even distribution of Fe3+ filler with good photo‐thermal conversion ability. With the increase of Fe3+ 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.