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Pyridine terminated polyurethane dendrimer/chlorinated butyl rubber nanocomposites with excellent mechanical and damping properties

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Chinese Journal of Chemical Engineering 2023年第1期53卷 211-221页

作者： Jiacheng Chen Jincheng Wang Shuhong Li Kailing Xiang Shiqiang Song College of Chemistry and Chemical Engineering Shanghai University of Engineering ScienceShanghai 201620China

Due to the special viscoelastic property, traditional rubber with high performance has been widely used in human life and production. However, it is challenging to improve the damping property without sacrificing the extensibility. In this work, a novel type of second-generation polyurethane dendrimer terminated with pyridine(G2-Py) was synthesized by using thiolactone chemistry and subsequently complexed with Zn ions. The structure and morphology of G2-Py were characterized. G2-Py-Zn2+was then mixed with chlorinated butyl rubber(CIIR) by a two-roll mill. A series of CIIR/G2-Py-Zn2+elastomers were obtained through vulcanization. CIIR/G2-Py-Zn2+elastomers could achieve high stretchability(a strain of ~1035%), high mechanical strength(a tensile stress of 7.64 MPa). This was benefitted from the friction between G2-Py and CIIR as well as variety of non-covalent bonds provided by G2-Py-Zn2+,which can dissipate energy to further improve the strength and extensibility. The coordination of Zn2+-pyridine was confirmed by Fourier transform infrared spectroscopy, stress relaxation and cycle tensile test. To further investigate the morphology and damping properties of the elastomers, scanning electron microscopy and dynamic mechanical analysis were performed. CIIR-5 showed the best damping performance with higher tan δ_(max) and wider effective damping temperatures. Therefore, this dendrimer modification technology provides wider applications for CIIR elastomers in daily life.

关键词： coordination bonds Hydrogen bonds Polyurethane dendrimer Nanostructure Polymers Composites

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A functionalized separator enables dendrite-free Zn anode via metal-polydopamine coordination chemistry

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InfoMat 2023年第3期5卷 11-20页

作者： Yanfen Liu Shude Liu Xuesong Xie Zhicheng Li Pinji Wang Bingan Lu Shuquan Liang Yan Tang Jiang Zhou School of Materials Science and Engineering Hunan Provincial Key Laboratory of Electronic Packaging and Advanced Functional MaterialsCentral South UniversityChangshaHunanthe People's Republic of China JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics National Institute for Materials ScienceTsukubaIbarakiJapan School of Mechanical Engineering Yonsei UniversitySeoulRepublic of Korea School of Physics and Electronics Hunan UniversityChangshaHunanthe People's Republic of China

Designing a multifunctional separator with abundant ion migration paths is crucial for tuning the ion transport in rocking-chair-type batteries.Herein,a polydopamine-functionalized PVDF(PVDF@PDA)nanofibrous membrane is designed to serve as a separator for aqueous zinc-ion batteries(AZIBs).The functional groups(OH and NH)in PDA facilitate the formation of Zn O and Zn N coordination bonds with Zn ions,homogenizing the Zn-ion flux and thus enabling dendrite-free Zn deposition.Moreover,the PVDF@PDA separator effectively inhibits the shuttling of V-species through the formation of V-O coordination bonds.As a result,the Zn/NH_(4)V_(4)O_(10) battery with the PVDF@PDA separator exhibits enhanced cycling stability(92.3%after 1000 cycles at 5 A g^(-1))and rate capability compared to that using a glass fiber separator.This work provides a new avenue to design functionalized separators for high-performance AZIBs.

关键词： aqueous zinc-ion batteries coordination bonds dendrite-free Zn deposition separators

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coordination-responsive drug release inside gold nanorod @ metal-organic framework core-shell nanostructures for near-infrared-induced synergistic chemo-photothermal therapy

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Nano Research 2018年第6期11卷 3294-3305页

作者： Yantao Li Jun Jin Dawei Wang Jiawei Lv Ke Hou Yaling Liu Chunying Chen Zhiyong Tang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China

Multifunctional core-shell nanostructures formed by integration of distinct components have received wide attention as promising biological platforms in recent years. In this work, crystalline zeolitic imidazolate framework-8 （ZIF-8）, a typical metal-organic framework （MOF）, is coated onto single gold nanorod （AuNR） core for successful realization of synergistic photothermal and chemotherapy triggered by near-infrared （NIR） light. Impressivel）~ high doxorubicin hydrochloride （DOX） loading capacity followed by pH and NIR light dual stimuli-responsive DOX release can be easily implemented through formation and breakage of coordination bonds in the system. Moreover, under NIR laser irradiation at 808 nm, these novel AuNR@MOF core-shell nanostructures exhibit effective synergistic chemo-photothermal therapy both in vitro and in vivo, confirmed by cell treatment and tumor ablation via intravenous injection.

关键词： core-shell nanostructures coordination bonds dual stimuli response synergistic cancer therapy

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