Macromolecular Rapid Communications

Cover image for Vol. 33 Issue 18

September 26, 2012

Volume 33, Issue 18

Pages 1497–1589

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Masthead
    5. Contents
    6. Communications
    1. Macromol. Rapid Commun. 18/2012 (page 1497)

      Guo-Dong Fu, Hua Jiang, Fang Yao, Li-Qun Xu, Jun Ling and En-Tang Kang

      Article first published online: 13 SEP 2012 | DOI: 10.1002/marc.201290063

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      Front Cover: Our article first reports a novel approach to prepare well-defined fluorescent polyethylene nanogels with precisely controlled molecular structure and functionalities via reverse (mini)emulsion copper(I)-catalyzed azide-alkyne cycloaddition. Further details can be found in the article by G.-D. Fu,* H. Jiang, F. Yao, L.-Q. Xu, J. Ling, and E.-T. Kang on page 1523.

  2. Back Cover

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Masthead
    5. Contents
    6. Communications
    1. Macromol. Rapid Commun. 18/2012 (page 1592)

      Daigeun Kim, Geunseok Jang, Jongho Kim, Seongwon Seo, Won Ho Park and Taek Seung Lee

      Article first published online: 13 SEP 2012 | DOI: 10.1002/marc.201290064

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      Back Cover: Our manuscript deals with highly efficient detection of cysteine using a complex of water-soluble hyperbranched conjugated polymer and cobalt ion. Upon exposure to cysteine, a more favorable cysteine–cobalt ion complex is formed which screens the incoming energy to excite the polymer, resulting in a quenching effect. The image illustrates the screening of blue excitation energy – the energy cannot reach the polymer. The Robot Taekwon V reflects the incoming excitation irradiation to protect the earth from a beam attack. Further details can be found in the article by D. Kim, G. Jang, J. Kim, S. Seo , W. H. Park, and T. S. Lee* on page 1510.

  3. Masthead

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Masthead
    5. Contents
    6. Communications
    1. Macromol. Rapid Commun. 18/2012

      Article first published online: 13 SEP 2012 | DOI: 10.1002/marc.201290065

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Masthead
    5. Contents
    6. Communications
    1. Macromol. Rapid Commun. 18/2012 (pages 1499–1503)

      Article first published online: 13 SEP 2012 | DOI: 10.1002/marc.201290062

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Back Cover
    4. Masthead
    5. Contents
    6. Communications
    1. Controlling Thermochromism in a Photonic Block Copolymer Gel (pages 1504–1509)

      Joseph J. Walish, Yin Fan, Andrea Centrone and Edwin L. Thomas

      Article first published online: 5 JUL 2012 | DOI: 10.1002/marc.201200355

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      The ability to control the color of self-assembled, photonic materials via temperature-induced changes is important for their use in sensors and displays. The thermochromic behavior of a PS–P2VP photonic gel was studied (UV–VIS, FTIR) and found to originate from a temperature-induced change in the pKa of the P2VP blocks in different acetic acid–water solutions. Control of the thermochromic response was obtained through the manipulation of the solution pH.

    2. Cobalt Ion-Mediated Cysteine Detection With a Hyperbranched Conjugated Polyelectrolyte as a New Sensing Platform (pages 1510–1516)

      Daigeun Kim, Geunseok Jang, Jongho Kim, Seongwon Seo, Won Ho Park and Taek Seung Lee

      Article first published online: 9 AUG 2012 | DOI: 10.1002/marc.201200441

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      A cobalt ion-mediated cysteine detection method is developed using water-soluble, conjugated, hyperbranched polymer as a sensing platform. A color change from colorless-to-yellow and a complete emission quenching can be obtained by addition of cysteine into the pre-complexed cobalt ion and the polymer in a buffer solution. This metal-mediated system exhibits a specific fluorescent response to cysteine even in the presence of other amino acids.

    3. Stress-Induced Melting of Crystals in Natural Rubber: a New Way to Tailor the Transition Temperature of Shape Memory Polymers (pages 1517–1522)

      Benjamin Heuwers, Dominik Quitmann, Frank Katzenberg and Joerg C. Tiller

      Article first published online: 3 JUL 2012 | DOI: 10.1002/marc.201200313

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      Shape memory natural rubber was found to be the first crystal-stabilized polymer network where the melting point of crystals can be dramatically influenced by the application of mechanical stress transverse to the direction of fixed strain. Beyond a critical stress, the crystals melt at ambient temperature, referred to as stress-induced melting.

    4. Preparation of Fluorescent Organometallic Porphyrin Complex Nanogels of Controlled Molecular Structure via Reverse-Emulsion Click Chemistry (pages 1523–1527)

      Guo-Dong Fu, Hua Jiang, Fang Yao, Li-Qun Xu, Jun Ling and En-Tang Kang

      Article first published online: 12 JUL 2012 | DOI: 10.1002/marc.201200337

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      A novel approach to preparing poly(ethylene glycol) (PEG) nanogels with precisely controlled molecular structure and desired functionality is developed via reverse (mini)emulsion CuAAC (REM-CuAAC). Nanogels with Ga-porphyrin complex and folate functional groups, and with sizes from 30 to 120 nm in diameter, exhibit an emission maxima within the wavelength range 700–800 nm.

    5. Dual Temperature and Thiol-Responsive POEOMA-Multisegmented Polydisulfides: Synthesis and Thermoresponsive Properties (pages 1528–1534)

      Qian Zhang, Seung Man Noh, Joon Hyun Nam, Hyun Wook Jung, Jong Myung Park and Jung Kwon Oh

      Article first published online: 22 JUN 2012 | DOI: 10.1002/marc.201200289

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      New thermoresponsive POEOMA-multisegmented polydisulfides with redox-responsive properties synthesized by a new method employing a combined RAFT/aminolysis and reversible thiol-disulfide redox reaction, which is initiated from the synthesis of new disulfide-labeled difunctional RAFT agent, exhibiting tunable thermoresponsive properties, lower critical solution temperature, and thiol-responsive degradation.

    6. A Highly Efficient Self-Assembly of Responsive C2-Cyclohexane-Derived Gelators (pages 1535–1541)

      Chuan-Liang Feng, Xiaoqiu Dou, Di Zhang and Holger Schönherr

      Article first published online: 6 JUL 2012 | DOI: 10.1002/marc.201200274

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      A new class of cyclohexane-based hydrogelators with sensitive pH-responsive properties has been designed and synthesized, enabling to optimize intermolecular interactions for a highly efficient pH-responsive assembly; the resulting molecular stacks further assemble to form pH-responsive nanofibrous hydrogels. The symmetric interactions between gelators are playing a significant role in specifying the structure of the final assembly.

    7. Polyelectrolytes with Main-Chain Perylene Units (pages 1542–1548)

      Daniel Dolfen, Kristina J. Schottler and Ullrich Scherf

      Article first published online: 2 JUL 2012 | DOI: 10.1002/marc.201200206

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      Synthesis and optical properties of a novel polyamine and the corresponding cationic zwitterionic polyelectrolytes with on-chain perylene units are described. The polymers show distinct solvatochromic effects. Depending on the nature of the solvent and on the polymer concentration aggregation/deaggregation processes occur.

    8. Hyaluronic Acid/Poly(β-Amino Ester) Polymer Nanogels for Cancer-Cell-Specific NIR Fluorescence Switch (pages 1549–1555)

      Hye Sun Park, Jung Eun Lee, Mi Young Cho, Ji Hyeon Hong, Sang Hee Cho and Yong Taik Lim

      Article first published online: 2 JUL 2012 | DOI: 10.1002/marc.201200246

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      pH-activatable NIR nanoprobes are synthesized based on HA/PBAE/ICG polymer nanogels, which display an 11-fold increase in NIR signal intensity when the pH is changed from 7.4 to 5.5. After targeting and internalization by receptor-mediated endocytosis, the HA/PBAE/ICG-polymer-nanogel-based probes generate a highly tumor-specific NIR signal with greatly reduced background.

    9. Thermoresponsive Copolymers of Ethylene Oxide and N,N-Diethyl Glycidyl Amine: Polyether Polyelectrolytes and PEGylated Gold Nanoparticle Formation (pages 1556–1561)

      Valerie S. Reuss, Mathias Werre and Holger Frey

      Article first published online: 25 JUN 2012 | DOI: 10.1002/marc.201200307

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      Poly(ethylene glycol)-poly(N,N-diethyl glycidyl amine) copolymers have been prepared by anionic ring-opening polymerization. Random copolymers show tunable thermoresponsive behavior. Block architectures can be used as precursors for neutral-charged polyether polyelectrolyte diblock copolymers and as dual reducing and capping agents for gold nanoparticle formation in aqueous solution.

    10. Tunable Fabrication of Two-Dimensional Arrays of Polymer Nanobowls for Biomimic Growth of Amorphous Calcium Carbonate (pages 1562–1567)

      Tao Ding, Kai Song, Guoqiang Yang and Chen-Ho Tung

      Article first published online: 2 JUL 2012 | DOI: 10.1002/marc.201200351

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      A general and facile approach is developed towards 2D polymer nanobowl arrays by a plasma etching technique. The monodisperse SiO2@PMMA core–shell particles are self-assembled into 2D colloidal crystals, followed by plasma etching for a certain duration. Subsequently, the SiO2 cores can be selectively etched to form the 2D arrays of PMMA nanobowls. The nanobowl arrays can serve as a template to biomimic the growth of amorphous calcium carbonate.

    11. Monitoring the Dynamics of Phase Separation in a Polymer Blend by Confocal Imaging and Fluorescence Correlation Spectroscopy (pages 1568–1573)

      Mikheil Doroshenko, Maria Gonzales, Andreas Best, Hans-Jürgen Butt, Kaloian Koynov and George Floudas

      Article first published online: 3 JUL 2012 | DOI: 10.1002/marc.201200322

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      The in situ investigation of the phase separation by LSCM is coupled with FCS measurements to provide the dynamics of phase demixing in a symmetric polymer blend. This combination demonstrates the possibility to obtain independent microscopic information on the local concentration within the phase-separated domains as well as estimation of the interfacial width by dynamic means.

    12. Using Cyclopenta[2,1-b:3,4-c′]dithiophene-4-one as a Building Block for Low-Bandgap Conjugated Copolymers Applied in Solar Cells (pages 1574–1579)

      Wei Zhang, Jiamin Cao, Ying Liu, Zuo Xiao, Weiguo Zhu, Qiqun Zuo and Liming Ding

      Article first published online: 2 JUL 2012 | DOI: 10.1002/marc.201200311

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      Copolymers P1-P4 based on a novel electron-accepting unit cyclopenta[2,1-b:3,4-c′]dithiophene-4-one were developed. They have low-lying HOMO energy levels (−5.41~−5.92 eV). P1 and P2 exhibit broad absorption and narrow optical bandgaps of 1.91 and 1.72 eV, respectively. P1/PC71BM solar cells afforded a PCE up to 2.72% and a high Voc up to ∼0.9 V.

    13. Synthesis of Cyclic Polyamines by Enzymatic Generation of an Amino Aldehyde In Situ (pages 1580–1583)

      Karim Engelmark Cassimjee, Sílvia Rodríguez Marín and Per Berglund

      Article first published online: 3 JUL 2012 | DOI: 10.1002/marc.201200347

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      Facile synthesis of circular polyamines from an amino alcohol by enzymatically forming a self-assembling amino aldehyde is presented. The amino aldehyde forms a polyimine, which is reduced to form a stable polyamine, circular since no terminating group is used. The enzyme has a broad substrate range, which permits the use of a variety of amino alcohols. This method may therefore be used for tailor-made polyamines for specific applications, for example, gene and drug delivery.

    14. Decomposition-Assembly of Tetraphenylethylene Nanoparticles With Uniform Size and Aggregation-Induced Emission property (pages 1584–1589)

      Tianxiang Wang, Yunbo Cai, Zhipeng Wang, Erjia Guan, Dahai Yu, Anjun Qin, Jingzhi Sun, Ben Zhong Tang and Changyou Gao

      Article first published online: 5 JUL 2012 | DOI: 10.1002/marc.201200324

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      Pure tetraphenylethylene nanoparticles (TPE NPs) emitting blue light composed of only AIE molecules are obtained by the hydrolysis of Schiff base in PAH-g-TPE and self-assembly of the liberated propeller-shaped TPE molecules under the guidance effect of linear and charged PAH molecules.

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