共查询到18条相似文献,搜索用时 78 毫秒
1.
2.
有机/无机杂化材料因其独特、优异的结构和性能已经成为目前材料领域的研究热点,硫醇-烯/炔点击化学是近年发展起来的一类新型点击化学,以其反应条件温和、速率快、产率高、产物容易分离以及高度选择性等优点受到国内外研究者的广泛关注。本文综述了近年来硫醇-烯/炔点击化学制备有机/无机杂化材料的研究进展,重点介绍了利用硫醇-烯/炔点击化学制备硅类、碳类、金属及金属氧化物类有机/无机杂化材料,并归纳了这些有机/无机杂化材料在生物医用、环境保护、光电材料等方面的应用,最后展望了硫醇-烯/炔点击化学制备有机/无机杂化材料未来的发展方向。 相似文献
3.
4.
5.
近年来,点击化学以其应用范围广、反应条件简单、速度快,产率高、环境友好、选择性强等诸多优点受到科学家的青睐,点击化学的概念对有机合成领域有很大的贡献,在药物开发和生物医用材料等诸多领域中,它已经成为目前最为有用和吸引人的合成理念之一.而巯基-烯/炔点击化学是近年来发展衍生出来的一类新型的点击化学,它以光引发自由基反应为催化介质,充分将光引发过程的优点和传统的点击反应的特点相结合,在特定的区域和官能团间反应,具有高度的选择性,成为合成材料的又一重要途径.本文着重就巯基-烯/炔点击化学在制备功能性聚合物微球、两亲性的嵌段聚合物、分子器件材料、高度支化聚合物等领域及化学修饰与改性方面进行了评述,并对点击化学在新领域中的应用及其发展方向进行了展望. 相似文献
6.
点击化学最新进展 总被引:4,自引:0,他引:4
点击化学(click chemistry)是由2001年诺贝尔化学奖获得者美国化学家 Sharpless首次提出。最主要的一类点击化学反应是Cu(Ⅰ)化合物催化叠氮化合物与炔基化合物反应生成1,2,3-三唑五元环化合物,它能够将两种不同物质通过五元环共价结合起来。该方法具备产量高、效率高、副反应少、反应条件温和、分离提纯简单、环境污染小等优点,因此得到了广泛的应用。目前点击化学的发展极为迅速,涉及到了各个领域,特别是在功能聚合物、表面修饰、生物大分子、DNAs,生物与化学传感器等方面取得了瞩目的成就。本文论述了点击化学反应的基本概念、特点及优势,对近几年点击化学的发展状况,以及一些最新研究成果作一简要概述,并展望了点击化学的发展前景。 相似文献
7.
ATRP与点击化学结合制备树状星型聚合物 总被引:2,自引:0,他引:2
本文通过将ATRP技术和点击化学相结合的方法来制备树状星型聚合物[(PMMA)2PSt]4. 首先通过1,3-偶极环加成反应对ATRP的核预聚物进行端基修饰, 得到后继ATRP反应的大分子引发剂, 进而引发第二单体的ATRP聚合生成树状星型聚合物. 相似文献
8.
9.
10.
近年来,通过仿生生命体自我修复损伤这一现象而研制的自修复材料,可有效延长材料的使用寿命、提高材料的使用安全性、降低资源浪费,具有巨大的发展潜力。其中,自修复有机硅材料因兼具自我修复的功能和有机硅材料的优异性能,已成为当下的研究热点。由于外界刺激条件如紫外光、温度等是材料实现损伤自我修复的外在驱动力,在很大程度上影响着材料的修复效能,且不同的刺激条件具有不同的优缺点和应用领域。因此,本文将基于自修复过程中外界刺激因素的不同,对自修复有机硅材料尤其是近五年来的最新研究成果进行综述,从外援型和本征型自修复有机硅材料两方面入手,以本征型自修复有机硅材料为重点,并对自修复有机硅材料今后的发展进行了分析展望。 相似文献
11.
12.
巯基-环氧反应作为一类典型的“点击化学”具有反应速度快、选择性高且反应条件温和等优点,近年来备受关注。本文首先阐述了巯基-环氧反应的碱催化机理,并评述了碱性催化剂、取代基团以及溶剂等因素对于巯基-环氧反应速率的影响。归纳认为,无机碱如氢氧化锂以及有机碱如四丁基氟化铵具有较高催化活性,并比较了无机碱和有机碱催化剂的优缺点;与供电子基团连接的巯基化合物以及与吸电子基团连接的环氧化合物具有较高的反应活性,位阻效应也对其有影响;在无溶剂的本体条件下反应活性较高。同时,重点介绍了巯基-环氧反应在高分子材料领域中应用的最新进展,并将其分为在溶剂中合成结构可控的高分子(包括线型或复杂结构高分子的合成和高分子或表面的修饰改性)以及本体条件下制备性能优良且具有应用价值的高分子网络两大类进行讨论。最后,简要展望了其发展前景。 相似文献
13.
Bin Chen Guian Wen Jiajie Wu Jiachun Feng 《Macromolecular rapid communications》2015,36(20):1836-1840
Covalently attaching lanthanide complexes to the polymer backbone can effectively reduce the clustering of lanthanides and thus become an important strategy to fully unleash their potential. In this Communication, a metal‐free click reaction is used for the first time to link a lanthanide complex to the polymer matrix. A diene‐bearing copolymer with anthracenylmethyl methacrylate as a monomer and a dienophile‐bearing lanthanide complex with 5‐maleimido‐1,10‐phenanthroline as the second ligand are synthesized and coupled together through a Diels–Alder cycloaddition (DA). A comparative investigation demonstrates that the composite material prepared by DA click reaction shows the highest quantum yields in the same lanthanide concentration as compared to materials prepared by widely used “directly doping” and “in situ coordinating lanthanide ions with macromolecular ligand” approaches. This work suggests that the “metal‐free” DA click reaction can be a promising tool in the synthesis of high efficient lanthanide functionalized polymeric materials.
14.
点击化学具有反应条件温和、产率高、速率快、产物容易分离以及高度选择性等优点,成为国内外研究的热点之一。硫醇-烯/炔光化学反应作为新型高效的点击反应近年来备受关注,通过这种方法制备高性能及功能性聚合物材料也是新材料领域的前沿研究内容。本文综述了近年来硫醇-烯/炔点击化学在功能聚合物材料合成中的研究成果,详细介绍了硫醇-烯/炔点击化学的特点、优势及其反应机理,重点归纳了利用硫醇-烯/炔点击化学合成线型、超支化、交联等分子结构的功能聚合物材料的研究进展,并对由这种方法合成功能聚合物的单体特点、反应路线及产物应用进行了阐述,最后对硫醇-烯/炔点击化学的进一步应用前景做了展望。 相似文献
15.
Yuzhen Zhao Zhenhua Li Qing Li Yang Zhao Ruijuan Yao Cheng Ma Yongming Zhang Dong Wang 《Molecules (Basel, Switzerland)》2022,27(15)
A high-yielding click reaction was used to synthesize a series of highly conjugated, symmetrical, as well as asymmetrical compounds with a benzene core. Cyclic voltammetry and ultraviolet/visible absorption spectroscopy were carried out, and proved that the side groups of the benzene derivatives played an important role in the energy gaps, and affected the third-order non-linear optical response. The maximum absorption wavelength of the series of benzene derivatives showed an obvious red-shift. Moreover, the addition of resilient electron-withdrawing groups significantly narrowed the energy levels as compared with precursors. The third-order nonlinear properties of this benzene derivative were tested by the Z-scan technique. The expected properties of this series of molecules were obtained, and it was found that the series of molecules undergoes a transition from reverse saturable absorption to saturable absorption, which has certain reference significance for a nonlinear optical field. 相似文献
16.
17.
Jeremy Yatvin Karson Brooks Prof. Jason Locklin 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(46):16348-16354
New forms of click chemistry present new opportunities in materials science. Sulfur(VI) fluoride exchange (SuFEx) is a recently discovered click reaction between molecules containing SOxF groups and silyl ethers, two functionalities that are orthogonal to all other known click chemistries, that generates sulfate or sulfonate connections upon the addition of certain organobases or fluoride sources. SuFEx also has several important advantages over other click reactions in that it is insensitive to ambient oxygen and water, and its precursor materials, especially SOxF, are chemically, UV, and thermally inert. This Concept article focuses on the unique reactivity of SuFEx and its relation to building high molecular weight polymers and surface coatings, both of which make it a powerful new tool for materials science. 相似文献
18.
Oliver Roling Kevin DeBruycker Benjamin Vonhren Lucas Stricker Martin Krsgen Heinrich F. Arlinghaus Bart Jan Ravoo Filip E. DuPrez 《Angewandte Chemie (International ed. in English)》2015,54(44):13126-13129
Triazolinedione (TAD) click reactions were combined with microcontact chemistry to print, erase, and reprint polymer brushes on surfaces. By patterning substrates with a TAD‐tagged atom‐transfer radical polymerization initiator (ATRP‐TAD) and subsequent surface initiated ATRP, it was possible to graft micropatterned polymer brushes from both alkene‐ and indole‐functionalized substrates. As a result of the dynamic nature of the Alder–ene adduct of TAD and indole at elevated temperatures, the polymer pattern could be erased while the regenerated indole substrate could be reused to print new patterns. To demonstrate the robustness of the methodology, the write–erase cycle was repeated four times. 相似文献