Macromolecular Chemistry and Physics

Cover image for Vol. 211 Issue 19

October 1, 2010

Volume 211, Issue 19

Pages 2059–2161

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Talents & Trends
    5. Full Papers
    1. Macromol. Chem. Phys. 19/2010

      Hiromasa Goto and Reina Ohta

      Article first published online: 24 SEP 2010 | DOI: 10.1002/macp.201090044

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      Front Cover: The image shows the polarizing optical microscopy image of a cholesteric liquid crystal medium. The structural chirality of the cholesteric liquid crystal results when an achiral polythiophene derivative bearing the azobenzene moiety is dissolved in the cholesteric liquid crystal. The chiral polymer thus obtained shows light-driven chiroptic modulation through the photo-isomerization of the azobenzene group in the substituent. Further details can be found in the article by H. Goto* and R. Ohta on page 2071.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Talents & Trends
    5. Full Papers
    1. Macromol. Chem. Phys. 19/2010 (pages 2059–2062)

      Article first published online: 24 SEP 2010 | DOI: 10.1002/macp.201090045

  3. Talents & Trends

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Talents & Trends
    5. Full Papers
    1. You have free access to this content
      Optical Probes of Charge Generation and Recombination in Bulk Heterojunction Organic Solar Cells (pages 2063–2070)

      Ian A. Howard and Frédéric Laquai

      Article first published online: 1 SEP 2010 | DOI: 10.1002/macp.201000353

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      Understanding the principles of charge generation and recombination in organic solar cells is a prerequisite for future material development and device optimization. Optical probes, especially transient absorption spectroscopy, are valuable tools to study the dynamics of excited states such as excitons and charges, over a wide-range of timescales. New insights from recent studies may help to guide the future material development without having to rely on entirely empirical strategies for device optimization.

  4. Full Papers

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Talents & Trends
    5. Full Papers
    1. Reconstruction of Achiral Polymer for Structural Chirality Using Cholesteric Liquid Crystal Medium and Light-Driven Chiroptic Modulation (pages 2071–2080)

      Hiromasa Goto and Reina Ohta

      Article first published online: 16 AUG 2010 | DOI: 10.1002/macp.201000168

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      The imprint of structural chirality and photo-induced chiroptic modulation: Dissolving achiral polythiophene derivatives bearing the azobenzene moiety, which have been synthesized in an isotropic toluene solution, in a cholesteric liquid crystal (Ch*LC) medium within the liquid crystal temperature range imparts chirality. The resultant polymers show light-driven chiroptic modulation.

    2. Synthesis and Properties of Alternating Fluorene-Based Oligomers for Sub-µm Photopatterning (pages 2081–2089)

      Esther Scheler, Eva Betthausen and Peter Strohriegl

      Article first published online: 16 AUG 2010 | DOI: 10.1002/macp.201000165

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      The synthesis, characterization and photopatterning behavior of alternating fluorene cooligomers is described. Different comonomers such as TPD, bithiophene and benzothiadiazole were alternatingly incorporated into the oligofluorene chain and the electrooptical properties were compared to their randomly linked counterparts. Photopatterning experiments reveal that under optimized conditions lateral resolutions of 600nm are possible.

    3. Hydrogen-Bonded Shape-Persistent Aryl Hydrazide Polymers: Side-Chain-Tuned Formation of Vesicles and Organogels (pages 2090–2101)

      Cen Zhou, Wei Cai, Gui-Tao Wang, Xin Zhao and Zhan-Ting Li

      Article first published online: 6 SEP 2010 | DOI: 10.1002/macp.201000259

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      Hydrogen bonding increases the planarity of the backbones of aromatic hydrazide-based extended polymers, while suitable side chains provide solubility. As a result, such polymers can self-assemble into vesicular structures or gelate organic solvents of both low and high polarity.

    4. Morphology of Semicrystalline Diblock Copolymer Thin Films upon Directional Solvent Vapor Flow (pages 2102–2108)

      Ezzeldin Metwalli, Jan Perlich, Weinan Wang, Alexander Diethert, Stephan V. Roth, Christine M. Papadakis and Peter Müller-Buschbaum

      Article first published online: 6 SEP 2010 | DOI: 10.1002/macp.201000343

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      An induced large-scale alignment of the parallel cylinder morphology of the polystyrene-block-polyethylene oxide thin filmvia treatment in a saturated benzene vapor that flows parallel to the film surface is realized. The enhanced alignment in the vapor-flow is attributed to a vapor-flow-induced shearing effect of the polymer film. The semicrystalline PEO block forms cylinders that initiate a growth rate with a favorable perpendicular orientation of the PEO crystalline stems with respect to the cylinder axis.

    5. Non-Ionic Homo- and Copolymers with H-Donor and H-Acceptor Units with an UCST in Water (pages 2109–2117)

      Jan Seuring and Seema Agarwal

      Article first published online: 6 SEP 2010 | DOI: 10.1002/macp.201000147

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      Detailed studies regarding the correlation between the UCST and the copolymer composition, polymer concentration and the presence of electrolytes for aqueous solutions of the homopolymer of N-acryloylglycinamide (NAGA), bearing H-donor and H-acceptor sites, and a UCST copolymer system based on H-donor NAGA and H-acceptor N-acetylacrylamide (NAcAAm) monomers are reported.

    6. Enhanced Thermal Diffusivity by Vertical Double Percolation Structures in Polyimide Blend Films Containing Silver Nanoparticles (pages 2118–2124)

      Daisuke Yorifuji and Shinji Ando

      Article first published online: 6 SEP 2010 | DOI: 10.1002/macp.201000294

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      Thermal diffusivity along the out-of-plane direction (D) in polyimide (PI) blend films containing silver nano particles is investigated. Micro phase-separated structures with a “vertical double percolation (VDP)” morphology are spontaneously formed in the films, and the blend films exhibit significantly higher D than that of mono phase homo-PI films. These results indicate that the VDP structure functions as an effective thermal conductive pathway.

    7. Face-to-Face Alignment of Porphyrin/Fullerene Nanowires Linked by Axial Metal Coordination (pages 2125–2131)

      Hua Xu and Jianyu Zheng

      Article first published online: 27 AUG 2010 | DOI: 10.1002/macp.201000162

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      A general approach to construct a one-dimensional face-to-face alignment of porphyrin/fullerene nanowires has been developed. The nanowires display regular one-dimensional linear arrays with lengths in the range 50–300nm and could have potential applications in photoelectronic devices, organic solar cells, etc.

    8. Efficient Molecular Weight Control with Trialkylaluminum in Ethylene/Norbornene Copolymerization by [Ph2C(Flu)(3-MeCp)]ZrCl2/Methylaluminoxane Catalyst (pages 2132–2137)

      Tomoyuki Tada, Zhengguo Cai, Yuushou Nakayama and Takeshi Shiono

      Article first published online: 27 AUG 2010 | DOI: 10.1002/macp.201000172

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      By choosing the amount ofiBu3Al or Et3Al added, thevalues of alternating ethylene/norbornene (EN) copolymers are widely controlled from 25 000 to 209 000g·mol−1 accompanied with an increase in the polymer yields by the use of [Ph2C(Flu)(3-MeCp)]ZrCl2 (1) combined with methylaluminoxane (MAO) in toluene.

    9. π-Conjugated Polymers Consisting of Isothianaphthene and Dialkoxy-p-phenylene Units: Synthesis, Self-Assembly, and Chemical and Physical Properties (pages 2138–2147)

      Takakazu Yamamoto, Motoaki Usui, Haruki Ootsuka, Takayuki Iijima, Hiroki Fukumoto, Yoshimasa Sakai, Shinji Aramaki, Hiroshi M. Yamamoto, Takehiko Yagi, Hiroyuki Tajima, Taku Okada, Takashi Fukuda, Akira Emoto, Hirobumi Ushijima, Miki Hasegawa and Hideki Ohtsu

      Article first published online: 27 AUG 2010 | DOI: 10.1002/macp.201000246

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      A series of π-conjugated polymers consisting of isothianaphthene and dialkoxy-p-phenylene units have been synthesized. The polymers assume an interdigitation-type self-assembled packing structure in the solid state, and molecularly align on the surface of the Pt plate. UV-Vis data have been elucidated on the basis of the π-stacked assembly of the polymers. The polymers undergo electrochemical p-doping at about 0.2V versus Ag+/Ag, and a p-doped polymer film showed a moderate electrical conductivity of 182S·cm−1.

    10. Poly(acrylic acid): A Combined Analysis with Field-Flow Fractionation and SAXS (pages 2148–2153)

      Patrick Knappe, Ralf Bienert, Steffen Weidner and Andreas F. Thünemann

      Article first published online: 6 SEP 2010 | DOI: 10.1002/macp.201000163

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      The determination of conformation and molar mass distribution of polyelectrolytes is a difficult analytical task. Online coupling of a separation procedure and a scattering method in the form of field-flow fractionation and small-angle X-ray scattering is used for characterization of a PAA mixture.

    11. Equilibrium Constants and Activation Rate Coefficients for Atom Transfer Radical Polymerizations at Pressures up to 2 500 Bar (pages 2154–2161)

      Michael Buback and Joachim Morick

      Article first published online: 27 AUG 2010 | DOI: 10.1002/macp.201000265

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      ATRP equilibrium constants,KATRP, and ATRP activation rate coefficients,kact, are measured up to 2500 bar by online-FT-NIR/VIS spectroscopy for several binary CuI/CuII ligand–alkyl bromide systems. The activation volume, ΔVact, is close to the reaction volume, ΔVR, that is obtained from the pressure dependence of KATRP. Both quantities reflect the characteristics of ligand complexation.

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