Macromolecular Chemistry and Physics

Cover image for Vol. 213 Issue 24

December 21, 2012

Volume 213, Issue 24

Pages 2561–2673

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Talents & Trends
    6. Full Papers
    7. Conference Report
    1. Macromol. Chem. Phys. 24/2012 (page 2561)

      Hideto Tsuji, Fumiaki Deguchi, Yuzuru Sakamoto and Satoru Shimizu

      Article first published online: 17 DEC 2012 | DOI: 10.1002/macp.201290080

      Thumbnail image of graphical abstract

      Front Cover: Hetero-stereocomplex (HTSC) crystallization occurs at the interface between poly(L-2-hydroxybutyrate (P(L-2HB)) and poly(D-lactide) (PDLA) in phase-separated blends. The HTSC crystallites form at temperatures between 80 and 160 °C. The cover picture shows polarized optical photomicrographs of neat P(L-2HB) and neat PDLA crystallized at 55 and 130 °C, respectively, along with that of their 50/50 blend crystallized at 165 °C. Further details can be found in the article by H. Tsuji,* F. Deguchi, Y. Sakamoto, and S. Shimizu on page 2573.

  2. Masthead

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Talents & Trends
    6. Full Papers
    7. Conference Report
    1. Macromol. Chem. Phys. 24/2012

      Article first published online: 17 DEC 2012 | DOI: 10.1002/macp.201290081

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Talents & Trends
    6. Full Papers
    7. Conference Report
    1. Macromol. Chem. Phys. 24/2012 (pages 2563–2566)

      Article first published online: 17 DEC 2012 | DOI: 10.1002/macp.201290079

  4. Talents & Trends

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Talents & Trends
    6. Full Papers
    7. Conference Report
    1. Polymers as Probes for Multimodal Imaging with MRI (pages 2567–2572)

      Kristofer J. Thurecht

      Article first published online: 22 OCT 2012 | DOI: 10.1002/macp.201200420

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      Polymeric systems are an ideal platform for developing multimodal molecular imaging agents due to the ability to tailor their chemo-physical properties. Polymers facilitate marrying imaging modalities that provide high resolution such as MRI, with highly sensitive modalities such as positron emission tomography or fluorescence, through manipulation of the chemical structure of the macromolecules.

  5. Full Papers

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Talents & Trends
    6. Full Papers
    7. Conference Report
    1. Heterostereocomplex Crystallization and Homocrystallization From the Melt in Blends of Substituted and Unsubstituted Poly(lactide)s (pages 2573–2581)

      Hideto Tsuji, Fumiaki Deguchi, Yuzuru Sakamoto and Satoru Shimizu

      Article first published online: 23 OCT 2012 | DOI: 10.1002/macp.201200395

      Thumbnail image of graphical abstract

      Heterostereocomplex (HTSC) crystallization of poly(L-2-hydroxybutyrate) and poly(D-lactide) occurs in their blends at the interface between poly(L-2-hydroxybutyrate)-enriched and poly (D-lactide)-enriched domains. HTSC crystallites are formed in the blends for crystallization temperature (Tc) = 80–160 °C, and exclusive formation of HTSC crystallites without formation of other crystalline species is observed for the samples crystallized at Tc of 150 or 160 °C, independent of the polymer blend ratio.

    2. Novel Chromatic Transitions of Azobenzene-Functionalized Polydiacetylene Aggregates in 1,2-Dichlorobenzene Solution (pages 2582–2589)

      Wenlong Hu, Jiang Hao, Jingguo Li, Gang Zou and Qijin Zhang

      Article first published online: 22 NOV 2012 | DOI: 10.1002/macp.201200402

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      Azobenzene-functionalized polydiacetylene (PDA) in solution exhibits novel chromatic transitions upon external stimulus. PDA1, PDA2, and PDA3 solutions exhibit three different chromatic transition behaviors upon thermo stimuli. Unlike the case upon thermo stimuli, PDA1, PDA2, and PDA3 solutions exhibit similar chromatic transition behaviors upon photostimuli.

    3. Synthesis and Characterization of Squaraine-Based Conjugated Polymers With Phenylene Linkers for Bulk Heterojunction Solar Cells (pages 2590–2597)

      Takeshi Maeda, Tatsuya Tsukamoto, Ayaka Seto, Shigeyuki Yagi and Hiroyuki Nakazumi

      Article first published online: 22 NOV 2012 | DOI: 10.1002/macp.201200382

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      Squaraine-based low-bandgap polymers with phenylene linkers are synthesized as electron donors for organic photovoltaics. Although their absorption and electrochemical properties depend mainly on those of the squaraine component, phenylene linkers influence their aggregation and phase-segregation in their composite films with acceptors (PCBM). Polymer–PCBM solar cells exhibit spectral responses in the long-wavelength region up to 900 nm.

    4. Radically Crosslinkable Poly(acrylic acid)s From Poly[(tert-butyl acrylate)-co-(3-aminopropyl vinyl ether)]: Synthesis and Rheological Properties (pages 2598–2605)

      Maximilian Maier, Christian Dollendorf, Helmut Ritter and Joachim E. Klee

      Article first published online: 23 OCT 2012 | DOI: 10.1002/macp.201200428

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      Crosslinkable poly(acrylic acid)s are synthesized via covalent attachment of hydrolytically stable curing moieties. Copolymers from tert-butyl acrylate and 3-aminopropyl vinyl ether are prepared and condensed with methacrylic or itaconic anhydride. Water- soluble polymers are subjected to crosslinking while rheological properties are evaluated.

    5. Controlled Fabrication of Uniform Hollow Bowl-Shaped Microspheres Based on Polyphosphazene Material (pages 2606–2610)

      Tingjun Pan, Xiaobin Huang, Hao Wei and Xiaozhen Tang

      Article first published online: 22 OCT 2012 | DOI: 10.1002/macp.201200441

      Thumbnail image of graphical abstract

      A novel, hollow, bowl-shaped microsphere based on polyphosphazene material is successfully fabricated for the first time by a facile solvent-treatment process. Appropriate solvent, treatment time, and wide PCTP concentrations are reported. Based on the SEM and TEM observations, the obtained particle is proven to be uniform with a shell thickness of about 120 nm, and a tentative mechanism is explored.

    6. Synthesis of (Bio)-Degradable Poly(β-thioester)s via Amine Catalyzed Thiol−Ene Click Polymerization (pages 2611–2617)

      Joke Vandenbergh, Kayte Ranieri and Thomas Junkers

      Article first published online: 22 OCT 2012 | DOI: 10.1002/macp.201200470

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      Poly(ester-sulfide)s are synthesized via hexylamine-catalyzed consecutive thiol-ene click Michael additions between 1,4-butanedithiol and 1,6-hexanediol diacrylate. Molecular weights are controlled by varying the stoichiometric monomer ratio and reaction time. After thermal characterization, the polymer is subjected to degradation using phosphate buffers, which partially hydrolyze the ester linkages, leading to semidegradation of the polymer chains.

    7. Polynorbornenes With Pendant Europium (III) Coordination Compounds (pages 2618–2627)

      Astrid-Caroline Knall, Christina Schinagl, Andreas Pein, Nadja Noormofidi, Robert Saf and Christian Slugovc

      Article first published online: 29 OCT 2012 | DOI: 10.1002/macp.201200454

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      Europium-containing monomers with pendant norbornoyl residues are prepared and incorporated in random copolymers and ampiphilic block copolymers using ring-opening metathesis polymerization (ROMP). The polymers show bright, red, long-lived luminescence upon excitation with ultraviolet light, which is characteristic for europium (III) compounds. The materials are furthermore tested regarding their ability as water vapor sensor materials.

    8. Alpha-Helix Self-Assembly of Oligopeptides Originated From Beta-Sheet Keratin (pages 2628–2638)

      Qianjie Zhang, Bernd M. Liebeck, Kelu Yan, Dan E. Demco, Andrea Körner and Crisan Popescu

      Article first published online: 26 OCT 2012 | DOI: 10.1002/macp.201200446

      Thumbnail image of graphical abstract

      The analysis of oligopeptides crystal formed from the oligopeptides solution extracted from the beta-sheet keratin by superheated water suggests that a change from beta-sheet to alpha-helix arrangement of the peptides occurs during the crystallization process. The results may help understanding the mechanism of self-assembly of amino-acids in biomaterials based on oligopeptides.

    9. Features of Double-Spiral “Valley-Hills” Surface Topography Formation in Photochromic Cholesteric Oligomer-Based Films and Their Changes Under Polarized Light Action (pages 2639–2646)

      Alexey Bobrovsky, Konstantin Mochalov, Anton Chistyakov, Vladimir Oleinikov and Valery Shibaev

      Article first published online: 8 NOV 2012 | DOI: 10.1002/macp.201200462

      Thumbnail image of graphical abstract

      Using a novel experimental method combining polarizing optical microscopy and atomic force microscopy, the surface topography and optical properties of a chiral-photochromic LC mixture are studied. Photoinduced effects, such as uniaxial mesogens orientation and changing in film topography, are found. It is shown that these effects are associated with E-Z, Z-E isomerization cycles of azobenzene groups, anisotropic cooperative photoinduced rotational diffusion, and directional cooperative mass-transport of chromophores and mesogens.

    10. Copolymerization of Bacterial Cell Wall Materials to Enhance Stability of Polyhydroxyalkanoate (pages 2647–2652)

      Ning Chen, Xu Xiang, Ratul Saha, Susan T. Bagley and Patricia A. Heiden

      Article first published online: 5 NOV 2012 | DOI: 10.1002/macp.201200503

      Thumbnail image of graphical abstract

      Polyhydroxybutanoate can be copolymerized with a bacterial cell wall component to give a polyesteramide with more thermal stability than the starting polymers. The result suggests alternative, less rigorous work-ups of bacterially generated polyesters might be designed to retain some cell wall components to give useful copolymer products.

    11. Chain Transfer to 2-Mercaptoethanol in Methacrylic Acid Polymerization in Aqueous Solution (pages 2653–2658)

      Nils F. G. Wittenberg, Michael Buback, Marek Stach and Igor Lacík

      Article first published online: 30 OCT 2012 | DOI: 10.1002/macp.201200484

      Thumbnail image of graphical abstract

      The propagation rate coefficient of water-soluble monomers is largely reduced in passing from dilute aqueous solution to bulk polymerization. Analysis of the transfer rate coefficient of 2-mercaptoethanol in methacrylic acid polymerization demonstrates that the transfer rate behaves as does propagation rate, which results in the transfer constant being insensitive towards monomer concentration.

    12. Tuning Dispersity in Diblock Copolymers Using ARGET ATRP (pages 2659–2668)

      Andrzej Plichta, Mingjiang Zhong, Wenwen Li, Andrea M. Elsen and Krzysztof Matyjaszewski

      Article first published online: 5 NOV 2012 | DOI: 10.1002/macp.201200461

      Thumbnail image of graphical abstract

      The dispersity of polymers is controlled by the catalyst concentration and reaction temperature in ARGET ATRP, forming polymers with dispersity ranging from 1.32 to 2.0. The disperse polymers retain high chain-end functionality, which is confirmed through liquid chromatography under critical conditions (LCCC) as well as chain extension to achieve broad-narrow and broad-broad diblock copolymers.

  6. Conference Report

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Talents & Trends
    6. Full Papers
    7. Conference Report
    1. First Symposium on Poly(2-oxazoline)s and Related Pseudo-Polypeptide Structures (pages 2669–2673)

      Victor R. de la Rosa, Petra J. M. Bouten and Richard Hoogenboom

      Article first published online: 21 NOV 2012 | DOI: 10.1002/macp.201200534

      The first symposium on poly(2-oxazo-line)s and related pseudo-polypeptide structures was held as part of the 243rd American Chemical Society National Meeting in San Diego (CA) from the 27th to the 29th of March 2012. The scientists will gather again to discuss the progress in the field at the second symposium on poly(2-oxazoline)s and pseudo-polypeptides at the ACS National Meeting in San Francisco, to be held in August 2014.

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