共价有机框架（COFs）作为一类新兴的结晶多孔聚合物，在功能材料研究领域备受瞩目。其独特的结构和性能使其在多个领域展现出巨大潜力，如电池、超级电容器、催化、水处理、传感器、药物递送和气体分离等。将 COFs 负载到聚合物基质中，能够结合 COFs 的刺激响应行为与聚合物的形状完整性和易加工性。近期，科研人员取得了新突破，成功合成了具有光热和溶剂敏感性的卟啉 COF，并将其掺入液晶聚合物（LCPs）基质中，制备出了一种新型智能驱动器。这一研究成果由北京大学杨槐、北京科技大学王茜和江西师范大学兰若尘团队以题目为“Dual-Stimuli-Responsive Covalent Organic Framework-Liquid Crystal Polymer Smart Actuator”发表在最新一期的《Advanced Functional Materials》上。文章第一作者是北京科技大学博士研究生刘茹。

图 POR-BHA COF-LCP双重致动器示意图

POR-BHA COF的合成与表征

Figure 1. a)Schematic representation of POR-BHA COF structure. b)PXRD pattern of POR-BHA COF. c)¹³C SS NMR of POR-BHA COF. d-f) XPS spectra of POR-BHA COF. d)C 1s, e)N 1s, f)O 1s. g)TEM image of POR-BHA COF particles. h)SAED pattern of POR-BHA COF. i)SEM image of POR-BHA COF particles. j)Elemental mapping images of POR-BHA COF.

POR-BHA COF在LCP驱动器中的光热效应性

Figure 2. Actuation and characterization of POR-BHA COF-LCP actuator. a)Infrared thermal imaging and photographic analysis of the POR-BHA COF-LCP actuator, illustrating reversible deformation in response to infrared irradiation. b)Time-dependent plot of bending angle for POR-BHA COF-LCP during actuation. c)Plot of bending angles for POR-BHA COF-LCP actuator under 808 nm light over 60 cycles. d)Splayed oriented POR-BHA COF-LCP film segmented at varying angles (I)90°, (II)0°, (III)45° and (IV)135° relative to the long axis. e)Tailoring angles and response behavior of POR-BHA COF-LCP actuators under NIR exposure.

POR-BHA COF-LCP驱动器的溶剂蒸汽响应性

Figure 3. Actuation and characterization of POR-BHA COF-LCP. a)Sequential photographs illustrating the reversible deformation of POR-BHA COF-LCP in response to DCM vapor exposure. b)Response behavior of POR-BHA COF-LCP actuators with varied tailoring angles under DCM vapor. c)Time-dependent plot of bending angle for POR-BHA COF-LCP during actuation. d)Plot of bending angles of POR-BHA COF-LCP actuator over 60 cycles in DCM vapor. e)Stress-strain curves of POR-BHA COF-LCP compared with LCP. f)SEM image depicting the fracture morphology of POR-BHA COF-LCP. g)SEM image of the fracture surface of LCP.

双响应POR-BHA COF-LCP驱动器

Figure 4. a)UV-vis spectra of POR-BHA COF and POR-BHA COF-LCP. b)Fluorescence spectra of POR-BHA COF and POR-BHA COF-LCP. c)Photograph of POR-BHA COF powder under natural light. d)Photo of POR-BHA COF powder under 365 nm UV light. e)Photograph of bionic flower under natural light. f)Photo of bionic flower under 365 nm UV light. g)Sequential images of bionic flower under NIR light. h)Photos capturing the response behavior of the bionic flower upon DCM vapor exposure. i)Images of POR-BHA COF-LCP gripper robot under NIR light. j)Images of POR-BHA COF-LCP light-control switch under NIR light.

  论文信息：Dual-Stimuli-Responsive Covalent Organic Framework-Liquid Crystal Polymer Smart Actuator

Ru Liu, Zerui Li, Haokai Zhao, Lanying Zhang, Ruochen Lan, Qian Wang, Huai Yang

  Advanced Functional Materials

  DOI: 10.1002/adfm.202418627

  原文链接：https://doi.org/10.1002/adfm.202418627