共查询到20条相似文献,搜索用时 234 毫秒
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Caixia Cheng Ye Tian Yanqiao Shi Rupei Tang Fu Xi 《Macromolecular rapid communications》2005,26(15):1266-1272
Summary: Fabrication of honeycomb‐patterned films from amphiphilic dendronized block copolymer (PEO113‐b‐PDMA82) by ‘on‐solid surface spreading’ and ‘on‐water spreading’ method is reported. Highly ordered honeycomb films with quasi‐horizontally paralleled double‐layered structure can be fabricated by the on‐solid surface spreading method. This work raises the possibility that such structures can be formed in amphiphilic dendronized block copolymers and extends the family of source materials.
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Jie Zhang Zhenning Yu Xinhua Wan Xiaofang Chen Qifeng Zhou 《Macromolecular rapid communications》2005,26(15):1241-1245
Summary: A series of helix‐coil diblock copolymers based on poly(ethylene oxide) and optically active helical poly{(+)‐2,5‐bis[4′‐((S)‐2‐methylbutoxy)phenyl]styrene} (PMBPS) were synthesized via atom transfer radical polymerization (ATRP). The synthetic methodology permitted straightforward preparation of the diblock copolymers with relatively low polydispersities and a broad range of compositions and molecular weights. Depending on the composing block length and the initial concentration, the copolymers self‐assembled into different supramolecular structures in aqueous solution, including spherical micelles, vesicles, multilamellar vesicles, large compound vesicles, and tubules.
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In this paper, we describe a new biomimetic approach to the synthesis of block copolymers with antifreeze properties. Our approach focuses on the design of block copolymers that mimic the structure and functionality of antifreeze proteins. Hyperbranched copolymers containing poly(ethylene oxide)‐polyethyleneimine blocks and polyglycidol side chains were synthesized and their antifreeze properties were studied. It is shown that these block copolymers can lower the freezing point of water up to 0.8 °C at a relatively low concentration (1 mg · mL−1). From DSC measurements it is proven that polyglycidol block copolymers slow down the crystallization kinetics of ice and lead to changes in the ice crystal morphology, as observed by cryo‐optical microscopy.
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Ullrich Scherf Sylwia Adamczyk Andrea Gutacker Nils Koenen 《Macromolecular rapid communications》2009,30(13):1059-1065
Based on their rigid‐rod structure all‐conjugated, rod‐rod block copolymers show a preferred tendency to self‐assemble into low‐curvature vesicular or lamellar nanostructures independent from their specific chemical structure and composition. This unique and attractive behaviour is clearly illustrated in a few examples of such all‐conjugated block copolymers. The resulting nanostructured heteromaterials may find applications in electronic devices or artificial membranes.
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Jin‐Baek Kim Ramakrishnan Ganesan So Young Yoo Jae‐Hak Choi Sang Yup Lee 《Macromolecular rapid communications》2006,27(17):1442-1445
Summary: A simple lithographic process in conjunction with a novel biocompatible nonchemically amplified photoresist material was successfully used for cell patterning. UV light irradiation on selected regions of the nonchemically amplified resist film renders the exposed regions hydrophilic by the formation of carboxylic groups. Mouse fibroblast cells were found to be preferentially aligned and proliferated on the UV light exposed regions of the nonchemically amplified resist film where carboxylic groups were present.
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Chensha Li Chi‐Wei Lo Difeng Zhu Chenhui Li Ye Liu Hongrui Jiang 《Macromolecular rapid communications》2009,30(22):1928-1935
The synthesis of an oriented liquid‐crystalline photoresponsive polymer, prepared by polymerization of mono‐ and di‐acrylates, both of which contain azobenzene chromophores, is reported. The prepared free‐standing polymer film shows strong reversible photoinduced deformation upon exposure to unpolarized UV light at 366 nm, as a result of an optically induced isomeric change of the azobenzene moieties in the polymer network. The synthesis process is relatively simple and more efficient compared to conventional ones, and can be used to synthesize other liquid‐crystalline photoresponsive polymers. The use of this photoresponsive polymer film as an optical high‐pass/low‐pass switch under UV or natural light irradiation for a laser beam is demonstrated. This photoresponsive polymer may have applications in robotic systems, artificial muscles, and actuators in microelectromechanical systems (MEMS) and labs on chips.
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Summary: PE‐block‐PS and P(E‐co‐P)‐block‐PS block copolymers were synthesised via sequential monomer addition during homogeneous polymerisation on various phenoxyimine catalysts. One phenoxyimine catalyst was tailored to produce high molecular weight block copolymers containing both, polyolefin and polystyrene segments. According to chromatographic analysis and TEM morphology studies, blends of block copolymers and PE homopolymers [or P(E‐co‐P), respectively] were formed. The direct olefin/styrene block copolymer synthesis on phenoxyimine catalysts represents an attractive, new one‐pot route to styrenic block copolymers which are commercially prepared by anionic styrene/diene block copolymerisation followed by hydrogenation.
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C Guinto Gamys Jean‐Marc Schumers Clment Mugemana Charles‐Andr Fustin Jean‐Franois Gohy 《Macromolecular rapid communications》2013,34(12):962-982
This review deals with nanoporous materials made from the self‐assembly of block copolymers with a special interest in the chemical functions covering the surface of their nanopores. A detailed overview of the existing methods and strategies to generate well‐defined organic functional groups covering the surface of the pore walls is provided. This further enables to finely tune the affinity of the pore walls and to perform well‐defined chemical reactions onto them, which is essential for further dedicated applications.
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Himabindu Nandivada Hsien‐Yeh Chen Joerg Lahann 《Macromolecular rapid communications》2005,26(22):1794-1799
Summary: The vapor‐based synthesis and characterization of a reactive polymer, poly[(4‐formyl‐p‐xylylene)‐co‐(p‐xylylene)] ( 1 ), have been reported. The reactive polymer coating enables the immobilization of oligosaccharides via the chemoselective aldehyde‐hydrazide coupling reaction.
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Anna Tsimelzon David Deamer Rebecca Braslau 《Macromolecular rapid communications》2005,26(23):1872-1877
Summary: An initiator for nitroxide mediated ‘living’ free radical polymerization was prepared with a fluorescent tag attached to the initiating alkyl radical terminus. This was used to synthesize amphiphilic poly(acrylic acid)‐block‐polystyrene diblock copolymers, which self assembled in a tetrahydrofuran/buffer solution to form structures that are visible by fluorescence.
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Sandra Demel Christian Slugovc Franz Stelzer Katalin Fodor‐Csorba Giancarlo Galli 《Macromolecular rapid communications》2003,24(10):636-641
Perfectly alternating copolymers can be synthesised by reacting diacrylates with terminal dienes using alternating diene metathesis polycondensation (ALTMET). This novel method is very versatile and allows preparation of diverse structures of polymers, including main‐chain liquid crystalline polymers.
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Morgan Tizzotti Aurelia Charlot Etienne Fleury Martina Stenzel Julien Bernard 《Macromolecular rapid communications》2010,31(20):1751-1772
This review covers the literature concerning the modification of polysaccharides through controlled radical polymerizations (NMP, ATRP and RAFT). The different routes to well‐defined polysaccharide‐based macromolecules (block and graft copolymers) and graft‐functionalized polysaccharide surfaces as well as the applications of these polysaccharide‐based hybrids are extensively discussed.
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Hidetaka Tobita 《Macromolecular theory and simulations》2011,20(3):179-190
In the ATRP and SFRP miniemulsion polymerization, a particle size range may exist in which the polymerization rate is larger than that of the corresponding bulk polymerization. Here, MC simulations are applied to clarify the reason for the acceleration. It is shown that the statistical variation of the trapping agent concentration (fluctuation effect) dominates the acceleration for good living conditions, while the segregation effect is important when the bimolecular termination is significant. Even for the segregation‐dominated conditions, the polymerization rate cannot be predicted accurately without accounting for the fluctuation effect.