材料科学
聚氨酯
执行机构
形状记忆合金
制作
液晶
弹性体
聚合物
复合材料
复合数
混溶性
计算机科学
人工智能
医学
病理
替代医学
作者
Chenjie Song,Yuhan Zhang,Jinying Bao,Ao Wang,Lanying Zhang,Jian Sun,Ruochen Lan,Zhan Yu,Siquan Zhu,Huai Yang
标识
DOI:10.1002/adfm.202213771
摘要
Abstract Liquid crystalline polymers (LCPs), especially liquid crystalline elastomers (LCEs) can generate ultrahigh shape change amplitude but has lower mechanical strength. Although some attempts have been tried to improve the mechanical performance of LCE, there are still limitations including complicated fabrication and high actuation temperature. Here, a versatile method is reported to fabricate light‐driven actuator by covalently cross‐linking polyurethane (PU) into LCP networks (PULCN). This new scheme is distinct from the previous interpenetrating network strategy, the hydrogen bonds and covalent bonds are used in this study to improve the miscibility of non‐liquid‐crystalline PU and LCP materials and enhance the stability of the composite system. This material not only possesses the shape memory properties of PU but shows shape‐changing behavior of LCPs. With a shrinkage ratio of 20% at the phase transition temperature, the prepared materials reached a maximum mechanical strength of 20 MPa, higher than conventional LCP. Meanwhile, the resulting film shows diverse and programmable initial shapes by constructing crosslinking density gradient across the thickness of the film. By integration of PULCN with near‐infrared light‐responsive polydopamine, local and sequential light control is achieved. This study may provide a new route for the fabrication of programmable and mechanically robust light‐driven soft actuator.
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