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  共價有機(jī)框架（COFs）作為一類新興的結(jié)晶多孔聚合物，在功能材料研究領(lǐng)域備受矚目。其獨(dú)特的結(jié)構(gòu)和性能使其在多個領(lǐng)域展現(xiàn)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(fù)載到聚合物基質(zhì)中，能夠結(jié)合 COFs 的刺激響應(yīng)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(zhì)中，制備出了一種新型智能驅(qū)動器。這一研究成果由北京大學(xué)楊槐、北京科技大學(xué)王茜和江西師范大學(xué)蘭若塵團(tuán)隊(duì)以題目為“Dual-Stimuli-Responsive Covalent Organic Framework-Liquid Crystal Polymer Smart Actuator”發(fā)表在最新一期的《Advanced Functional Materials》上。文章第一作者是北京科技大學(xué)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(qū)動器中的光熱效應(yīng)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(qū)動器的溶劑蒸汽響應(yīng)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(yīng)POR-BHA COF-LCP驅(qū)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