Macromolecular Rapid Communications

Cover image for Vol. 32 Issue 8

April 19, 2011

Volume 32, Issue 8

Pages 627–688

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Communications
    1. Macromol. Rapid Commun. 8/2011

      Huanli Dong, Zhishan Bo and Wenping Hu

      Version of Record online: 8 APR 2011 | DOI: 10.1002/marc.201190019

      Thumbnail image of graphical abstract

      Cover: Thin film phototransistors of a planar conjugated copolymer named HXS-1 were fabricated. All devices exhibited high mobility and stability with on/off ratio up to 4.6×104, indicating the potential applications of the devices in polymer-based optoelectronics. Further details can be found in the Communication by H. Dong, Z. Bo,* and W. Hu*on page 649.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Communications
    1. Macromol. Rapid Commun. 8/2011 (pages 627–629)

      Version of Record online: 8 APR 2011 | DOI: 10.1002/marc.201190018

  3. Communications

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Communications
    1. Azide-based Cross-Linking of Polymers of Intrinsic Microporosity (PIMs) for Condensable Gas Separation (pages 631–636)

      Naiying Du, Mauro M. Dal- Cin, Ingo Pinnau, Andrzej Nicalek, Gilles P. Robertson and Michael D. Guiver

      Version of Record online: 11 MAR 2011 | DOI: 10.1002/marc.201000775

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      Cross-linked PIMs prepared by a nitrene reaction are first reported as promising materials for membrane gas separation. The membranes show excellent gas separation performance - high permeability combined with moderate selectivity, which is close to, or exceeds the upper bound. The membranes can be utilized for separating O2/N2 and CO2/N2 gas pairs, and are less susceptible to plasticization for condensable gases CO2/CH4 and propylene/propane.

    2. Electrochemical Fluorescence Switching from a Patternable Poly(1,3,4-oxadiazole) Thin Film (pages 637–643)

      Seogjae Seo, Yuna Kim, Jungmok You, Bhimrao D. Sarwade, Prakash P. Wadgaonkar, Shamal K. Menon, Arvind S. More and Eunkyoung Kim

      Version of Record online: 11 MAR 2011 | DOI: 10.1002/marc.201000791

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      A highly soluble poly(1,3,4-oxadiazole) (POD) substituted with long alkyl chains showed reversible electrochemical fluorescence switching between dark (n-doping) and bright (neutral) states. POD film was photo-patterned to obtain high contrast secure images which displayed patterned image reversibly under a step potential of +1.8/−1.8V (vs. Ag/AgCl).

    3. Application of Alkyne-TCNQ Addition Reaction to Polymerization (pages 644–648)

      Yusuke Washino and Tsuyoshi Michinobu

      Version of Record online: 11 MAR 2011 | DOI: 10.1002/marc.201100025

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      A high-yielding addition reaction between dialkylaniline-substituted alkynes and 7,7,8,8-tetracyanoquinodimethane (TCNQ) moieties is for the first time employed to synthesize linear polymers and cyclic compounds. The ratio of linear polymers and cyclic compounds can be controlled by the monomer concentration. The products showed a high thermal stability, well-defined charge-transfer (CT) bands, and redox activities.

    4. High Performance Phototransistors of a Planar Conjugated Copolymer (pages 649–653)

      Huanli Dong, Zhishan Bo and Wenping Hu

      Version of Record online: 24 JAN 2011 | DOI: 10.1002/marc.201000732

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      A planar conjugated copolymer named HXS-1 is applied in thin film phototransistors. All devices exhibit high performance with an on/off ratio up to 4.6×104. The wide absorption features of HXS-1 in the whole UV-vis range, the ideal HOMO energy level and the high mobility of the polymer thin films are responsible for the high performance of the devices. The devices exhibit excellent stability indicating potential applications in polymer-based optoelectronics.

    5. Conjugation of siRNA with Comb-Type PEG Enhances Serum Stability and Gene Silencing Efficiency (pages 654–659)

      Karthikeyan Gunasekaran, Thi H. Nguyen, Heather D. Maynard, Thomas P. Davis and Volga Bulmus

      Version of Record online: 17 MAR 2011 | DOI: 10.1002/marc.201000804

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      Reversible siRNA conjugates with well-defined comb-like PEG polymers exhibit higher nuclease resistance and inhibition of protein expression compared to unmodified siRNA. In this study, we demonstrate that reversible siRNA conjugates with well-defined comb-like PEG polymers exhibit higher in vitro nuclease resistance and inhibition of protein expression compared to unmodified siRNA. Our finding support the comb-like PEG (meth)acrylate polymers synthesized by RAFT polymerization as an effective component of delivery systems for siRNA.

    6. Synthesis of Thermo-Responsive Polymers With Both Tunable UCST and LCST (pages 660–664)

      Hai-Ying Tian, Jun-Jie Yan, Di Wang, Chen Gu, Ye-Zi You and Xue-Si Chen

      Version of Record online: 7 MAR 2011 | DOI: 10.1002/marc.201000713

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      A novel thermo-sensitive diblock copolymer with both UCST and LCST has been prepared via RAFT polymerization. The LCST could be finely controlled by tuning the fraction of OEGMA units in the random copolymer, and the UCST could be easily tuned by the degree of quaternization (DQ) of poly(OEGMA-co-MEO2MA)-b-poly(DMAPMA).

    7. SEC-MR-NMR: Online Coupling of Size Exclusion Chromatography and Medium Resolution NMR Spectroscopy (pages 665–670)

      Markus Cudaj, Gisela Guthausen, Thorsten Hofe and Manfred Wilhelm

      Version of Record online: 11 MAR 2011 | DOI: 10.1002/marc.201000760

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      1H NMR spectra of homo- and block copolymers with acceptable resolution and sensitivity are recorded in the new online coupling of size exclusion chromatography with medium resolution nuclear magnetic resonance (SEC-MR-NMR). An essential issue is suppression of the predominant solvent signals. Both T1 relaxation differences and mathematical data treatment are exploited for this purpose.

    8. Opto-Mechanical Effect in Photoactive Nematic Side-Chain Liquid-Crystalline Elastomers (pages 671–678)

      Antoni Sánchez-Ferrer, Alexey Merekalov and Heino Finkelmann

      Version of Record online: 11 MAR 2011 | DOI: 10.1002/marc.201100005

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      Opto-mechanical experiments on nematic liquid-crystalline elastomers which contain azobenzene molecules (pendant groups or crosslinkers) show the actuation efficiency of these systems. The results allow the calculation of the kinetic rates during photo- and thermal-isomerization, as well as their energetic barriers. With these results, the isomerization of azocompounds in liquid-crystalline elastomers follows the inversion mechanism.

    9. Fluorescent Core-Shell Star Polymers Based Bioassays for Ultrasensitive DNA Detection by Surface Plasmon Fluorescence Spectroscopy (pages 679–683)

      Chuan Liang Feng, Meizhen Yin, Di Zhang, Shenmin Zhu, Anne Marie Caminade, Jean Pierre Majoral and Klaus Müllen

      Version of Record online: 7 MAR 2011 | DOI: 10.1002/marc.201000788

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      Schematic demonstration of the detection of DNA hybridization on a silver surface deposited with multilayer containing a fluorescent star polymer (FSP) donor layer and a phosphorous dendrimer layer by layer-by-layer (LBL) approach, the enhanced optical fields associated with energy transfer (ET) from FSP donors to dye labelled DNA targets in surface plasmon field enhanced fluorescence spectroscopy (SPFS).

    10. Reduction of Graphene Oxide by Aniline with Its Concomitant Oxidative Polymerization (pages 684–688)

      Li Qun Xu, Yi Liang Liu, Koon-Gee Neoh, En-Tang Kang and Guo Dong Fu

      Version of Record online: 22 MAR 2011 | DOI: 10.1002/marc.201000765

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      Graphene oxide (GO) nanosheets are readily reduced by aniline above room temperature in an aqueous acid medium, with the aniline simultaneously undergoing oxidative polymerization to produce the reduced graphene oxide-polyaniline nanofiber (RGO-PANi) composites.

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