共查询到19条相似文献,搜索用时 156 毫秒
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具有力刺激响应发光特性的聚合物材料是刺激响应发光材料的重点研究方向,在聚合物力化学、应力检测、聚合物损伤监控、特种包装材料等领域受到了化学家和材料学家的广泛关注。这类材料通常是将具有力刺激响应发光特性的小分子作为发光力敏团,通过化学键合或物理掺杂的方式引入聚合物基体中制备得到。力刺激作用通过聚合物基体传导到发光力敏团,引起发光信号变化,实现力刺激响应发光。本文结合发光力敏团的力刺激响应发光原理和力刺激响应发光聚合物的制备方法,对力刺激响应发光聚合物进行了综述,期望对力刺激响应发光聚合物的研发设计和实际应用提供借鉴。 相似文献
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聚合物在材料表面通过物理吸附或化学接枝所形成的刷子状单分子层被称为聚合物刷,环境响应性聚合物刷能够根据环境微小变化可逆改变自身的物理化学性质,高分子链构象呈现伸展或塌缩状态等,显示了潜在的应用价值。本文综述了环境响应性聚合物刷的研究进展,讨论了温度响应性、pH值响应性、光响应性聚合物刷的结构特征和环境响应性机制,以及聚合物刷的各种制备方法,并着重介绍了其在智能膜、药物控释、催化、自组装、分子器件等领域的应用。 相似文献
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表面引发聚合新进展及应用 总被引:1,自引:0,他引:1
综述了近年来聚合物刷合成与应用方面的新进展.简要介绍了利用表面引发原子转移自由基聚合(SI-ATRP)制备聚合物刷的历程和重要进展.重点论述了通过电化学、光诱导以及牺牲阳极技术、仿生合成等发展了多种表面引发ATRP新方法,基于如何将聚合物从分子尺度过渡到微米尺度的思考,实现了多尺度聚合物刷结构的制备.简要综述了聚合物刷在以下3个方面的应用研究:(1)智能驱动,利用聚合物刷构象变化,实现微悬臂驱动、辅助放大的电驱动以及仿毛毛虫运动.(2)生物润滑,利用聚合物的环境响应行为实现了对摩擦系数的调控,并发展了球刷型润滑材料.(3)表面防污,表面接枝含离子液体官能团的聚合物刷,并与仿生技术相结合,利用化学组成和结构化协同效应,得到一系列高性能低毒海洋防污界面材料. 相似文献
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近十几年来, 纳米科学的发展极大地推动了纳米材料在生物医用领域的应用. 聚合物纳米粒子由于其独特的性能在药物传递、医学成像等医用领域备受关注. 其中, 刺激响应型聚合物纳米粒子是一类可以在外界信号刺激下(包括pH、温度、磁场、光等)发生结构、形状、性能改变的纳米粒子. 利用这种刺激响应性可调节纳米粒子的某种宏观行为, 故而刺激响应型聚合物纳米粒子也被称为智能纳米粒子. 因为其特有的“智能性”, 刺激响应型聚合物纳米粒子的研究已成为当前生物材料领域的研究热点. 本文综述了几类重要的生物医用刺激响应型聚合物纳米粒子, 侧重介绍双重及多重刺激响应型聚合物纳米粒子的制备及其生物医学应用. 相似文献
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本文主要介绍了以聚合物体系作为门控构筑的基于介孔二氧化硅纳米粒子的刺激响应性药物控释体系, 并根据聚合物类别将门控体系分为聚合物刷、 聚合物交联网络和聚合物包裹层三类. 根据聚合物“阀门”与无机纳米粒子的共价或非共价连接方式, 综述了这些杂化材料在不同外界刺激作用下的药物控制释放行为, 并给出该领域所面临的机遇和挑战. 相似文献
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刺激响应型聚合物是一类功能性聚合物,它在药物控制释放、基因载体、纳米粒子以及纳米反应器等众多领域具有广阔的应用前景,因此引起了越来越多科学工作者的关注。刺激响应型聚合物多为双亲性聚合物,可通过自组装的方式得到形态各异的聚集体,如胶束、囊泡等。在受到某些外界环境刺激时,它们会产生特异性响应,尤其是功能性聚合物嵌段会发生相应的变化,从而引起整个聚合物结构的相转变和体积相转变。根据环境刺激种类的不同,刺激响应型聚合物可以分成不同类型,本文主要介绍了pH、温度、光、分子、电化学和手性等响应型聚合物,并概括了它们的结构特点以及不同的合成方法,简单说明了它们具有刺激响应功能的作用机理,阐述了结构与性能的联系。另外,还介绍了它们的潜在应用,并对此类聚合物的发展前景作了展望。 相似文献
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作为受限高分子体系的一个经典模型,高分子刷在胶体稳定、聚合物链的自组装以及摩擦学等方面具有潜在的应用价值。 本文通过原子转移自由基聚合(ATRP)和点击化学(Click Chemistry)方法在金(Au)基底表面制备了pH响应性聚4-乙烯基吡啶-b-聚乙二醇(P4VP-b-PEG)嵌段聚合物刷。 通过频率-耗散型石英微天平(QCM-D)、X射线光电子能谱(XPS)和原子力显微镜(AFM)等技术手段分别对Au/P4VP-b-PEG聚合物刷经不同pH值溶液处理后的形态变化、表面组成和表面形貌进行了进一步深入研究。 结果表明,用不同pH值溶液处理P4VP-b-PEG嵌段聚合物刷后,该聚合物刷呈现刺激响应规律。 当pH=1.5时,P4VP链段质子化,由于静电排斥作用使P4VP-b-PEG链段呈伸展构象;当pH=11.5时,P4VP链段去质子化,并且由于失去部分结合水,P4VP-b-PEG链段呈塌缩构象。 相似文献
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Omar Azzaroni 《Journal of polymer science. Part A, Polymer chemistry》2012,50(16):3225-3258
Bottom‐up surface processing with well‐defined polymeric structures becomes increasingly important in many current technologies. Polymer brushes, that is, assemblies of macromolecules tethered at one end to a substrate, provide an exemplary system of materials capable of achieving such a goal. While the focus in the past decades has been mostly on their synthetic aspects and the in‐depth study of their interesting properties, from several years now the core area of research has already started to shift towards specific practical applications. Ample functional versatility and relative ease of preparation are special strengths of polymer brushes, lending them a strong interdisciplinary character. To this end, this work is entirely dedicated to bringing together the latest research on applications of polymer brushes in multiple research fields. The aim of this review are twofold: first, to give a critical discussion of the current status of development of application‐oriented research on polymer brushes, and second, to inform the reader as to what can be done with polymer brushes in multiple research fields. It is therefore hoped that the juxtaposition of perspectives from different disciplines in one place will stimulate and contribute to the ongoing process of cross‐fertilization that is driving this fascinating and emerging area of polymer science. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012 相似文献
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Estillore NC Advincula RC 《Langmuir : the ACS journal of surfaces and colloids》2011,27(10):5997-6008
We report a facile approach to preparing binary mixed polymer brushes and free-standing films by combining the layer-by-layer and surface-initiated polymerization (LbL-SIP) techniques. Specifically, the grafting of mixed polymer brushes of poly(n-isopropylacrylamide) and polystyrene (pNIPAM-pSt) onto LbL-macroinitiator-modified planar substrates is described. Atom transfer radical polymerization (ATRP) and free radical polymerization (FRP) techniques were employed for the syntheses of pNIPAM and pSt, respectively, yielding pNIPAM-pSt mixed polymer brushes. The composition of the two polymers was controlled by varying the number of macroinitiator layers deposited on the substrate (i.e., LbL layers = 4, 8, 12, 16, and 20); consequently, mixed brushes of different thicknesses and composition ratios were obtained. Moreover, the switching behavior of the LbL-mixed brush films as a function of solvent and temperature was demonstrated and evaluated by water contact angle and atomic force microscopy (AFM) experiments. It was found that both the solvent and temperature stimuli responses were a function of the mixed brush composition and thickness ratio where the dominant component played a larger role in the response behavior. Furthermore, the ability to obtain free-standing films was exploited. The LbL technique provided the macroinitiator density variation necessary for the preparation of stable free-standing mixed brush films. Specifically, the free-standing films exhibited the rigidity to withstand changes in the solvent and temperature environment and at the same time were flexible enough to respond accordingly to external stimuli. 相似文献
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The recent progress of wide bandgap (WBG) donor polymers for non-fullerene polymer solar cells (NF-PSCs) were reviewed in detail, which was classified by D-type and D-A type molecular backbones to discuss the related structure-property correlations and put forward an outlook for future innovations. 相似文献
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Facile Fabrication of Concentrated Polymer Brushes with Complex Patterning by Photocontrolled Organocatalyzed Living Radical Polymerization 下载免费PDF全文
Dr. Chen‐Gang Wang Chen Chen Dr. Keita Sakakibara Prof. Dr. Yoshinobu Tsujii Prof. Dr. Atsushi Goto 《Angewandte Chemie (International ed. in English)》2018,57(41):13504-13508
Photocontrolled surface‐initiated reversible complexation mediated polymerization (photo‐SI‐RCMP) was successfully applied to fabricate concentrated polymer brushes with complex patterning structures. Positive‐type patterned polymer brushes were obtained by photo‐SI‐RCMP under visible light (550(±50) nm) using photomasks. A particularly interesting finding was that negative‐type patterned polymer brushes were also obtainable in a facile manner. A nonspecial UV light (250–385 nm) enabled the preparation of pre‐patterned initiator surfaces in a remarkably short time (1 min), leading to negative‐type patterned polymer brushes. Based on this unique selectivity between visible and UV light, the combination of two patterning techniques enabled the preparation of complex patterned brushes, including diblock copolymers, binary polymers, and functional binary polymers, without multistep immobilization of one or more initiators on the surfaces. 相似文献
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In this review the grafting of polymer chains to solid supports or interfaces and the subsequent impact on colloidal properties is examined. We start by examining theoretical models for densely grafted polymers (brushes), experimental techniques for their preparation and the properties of the ensuing structures. Our aim is to present a broad overview of the state of the art in this field, rather than an in-depth study. In the second section the interactions of surfaces with tethered polymers with the surrounding environment and the impact on colloidal properties are considered. Various theoretical models for such interactions are discussed. We then review the properties of colloids with tethered polymer chains, interactions between planar brushes and nanocolloids, interactions between brushes and biocolloids and the impact of grafted polymers on wetting properties of surfaces, using the ideas presented in the first section. The review closes with an outlook to possible new directions of research. 相似文献