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  共價有機框架（COFs）作為一類新興的結晶多孔聚合物，在功能材料研究領域備受矚目。其獨特的結構和性能使其在多個領域展現出巨大潛力，如電池、超級電容器、催化、水處理、傳感器、藥物遞送和氣體分離等。將 COFs 負載到聚合物基質中，能夠結合 COFs 的刺激響應行為與聚合物的形狀完整性和易加工性。近期，科研人員取得了新突破，成功合成了具有光熱和溶劑敏感性的卟啉 COF，并將其摻入液晶聚合物（LCPs）基質中，制備出了一種新型智能驅動器。這一研究成果由北京大學楊槐、北京科技大學王茜和江西師范大學蘭若塵團隊以題目為“Dual-Stimuli-Responsive Covalent Organic Framework-Liquid Crystal Polymer Smart Actuator”發表在最新一期的《Advanced Functional Materials》上。文章第一作者是北京科技大學博士研究生劉茹。

圖 POR-BHA COF-LCP雙重致動器示意圖

POR-BHA COF的合成與表征

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驅動器中的光熱效應性

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驅動器的溶劑蒸汽響應性

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.

雙響應POR-BHA COF-LCP驅動器

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.

  論文信息：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

  原文鏈接：https://doi.org/10.1002/adfm.202418627