Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 50 Issue 2

15 January 2012

Volume 50, Issue 2

Pages i–ii, 83–153

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
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      Cover Image, Volume 50, Issue 2 (pages i–ii)

      Article first published online: 12 DEC 2011 | DOI: 10.1002/polb.23013

      Thumbnail image of graphical abstract

      Block-selective polydispersity strongly influences the structure formation in block copolymer/homopolymer blends, as presented by Michael R. Bockstaller and colleagues on page 106. In particular, block-selective polydispersity decreases the solubility of homopolymer within the narrowdisperse block of the copolymer and drives the segregation of the filler to the center of the narrowdisperse host copolymer domain. This gives rise to a pronounced increase of the domain period with increasing amount of homopolymer and promotes the formation of phase coexistence regimes. The picture presents a processed electron micrograph revealing gyroid/lamellar coexistence.

  2. Reviews

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
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      Assembling hyperbranched polymerics (pages 83–100)

      Sergiy Peleshanko and Vladimir V. Tsukruk

      Article first published online: 26 SEP 2011 | DOI: 10.1002/polb.22361

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      Hyperbranched polymers form unique assemblies in solution, at surfaces, and at interfaces. Knowing their structure—surface property relationships is highly beneficial for their prospective applications in biomedical, sensing, tribological, advanced nanocomposites, and drug delivery fields. The hydrophobic or hydrophilic nature of the end groups along with specific amphiphilic core-shell architecture of the hyperbranched polymers provides superior control over the ordering of the macromolecules on a surface.

  3. Communications

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    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    1. Layer-by-layer ionomer films made from poly(styrene-co-styrenesulfonic acid) and poly(methyl methacrylate-co-4-vinylpyridine) in tetrahydrofuran (pages 101–105)

      Wenjie Chen and Masanori Hara

      Article first published online: 31 OCT 2011 | DOI: 10.1002/polb.22385

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      Layer-by-layer solution (LbL) deposition is a powerful method to fabricate high quality films of polyelectrolytes. Although water is usually used in LbL, organic solvents are used when the film components are ionomers. The mechanical study of such thin films shows unique deformation behavior, observed neither for the similar multilayer structures conventionally made via coextrusion nor for the polymer blend prepared from the same ionomer pair.

  4. Full Papers

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    1. Effect of block molecular weight distribution on the structure formation in block copolymer/homopolymer blends (pages 106–116)

      Jessica Listak, Xiaolong Jia, Andrzej Plichta, Mingjiang Zhong, Krzysztof Matyjaszewski and Michael R. Bockstaller

      Article first published online: 23 AUG 2011 | DOI: 10.1002/polb.22339

      Thumbnail image of graphical abstract

      Block-selective polydispersity is shown to strongly influence the structure formation in block copolymer/homopolymer blends. In particular, block-selective polydispersity decreases the solubility of homopolymer within the narrowdisperse block of the copolymer thus resulting in the segregation of the filler to the center of the host copolymer domain. The pronounced increase of the block copolymer repeat indicates novel opportunities of blends based on polydisperse block copolymers in areas such as polymer photonics.

    2. Influence of molecular weight on the short-channel effect in polymer-based field-effect transistors (pages 117–124)

      Ali Veysel Tunc, Bernhard Ecker, Zekeriya Dogruyol, Sabrina Jüchter, Ahmet Lütfi Ugur, Ali Erdogmus, Sait Eren San, Jürgen Parisi and Elizabeth von Hauff

      Article first published online: 8 SEP 2011 | DOI: 10.1002/polb.22353

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      In polymer electronics, basic polymer properties can have significant effects on device characteristics and performance. The relationship between intrinsic semiconductor properties and the short channel effect in polymer-based field effect transistors is demonstrated. It is seen that a high molecular weight can lead to higher channel currents and field effect mobilities. A high distribution of molecular weights, on the other hand, results in short channel behavior.

    3. Improved efficiency of organic solar cells with modified hole-extraction layers (pages 125–128)

      Jiao Li, Juncheng Liu and Congjie Gao

      Article first published online: 8 NOV 2011 | DOI: 10.1002/polb.22356

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      Increasing device efficiency of organic solar cells (OSCs) is a fundamental goal in the study of photovoltaics. Improved performance of OSCs can be achieved by the addition of an oxidizing substance in the hole-extraction layer. Here, the effect of modified hole-extraction layers on solar cell efficiency is studied, showing that performance is very sensitive to the conductivity and optical transmittance of the hole-extraction layer. OSCs with added bromine show an improved power conversion efficiency from 2.12 to 3.16%.

    4. Magnetism, optical absorbance, and 19F NMR spectra of nafion films with self-assembling paramagnetic networks (pages 129–138)

      E. M. Levin, Q. Chen and S. L. Bud'ko

      Article first published online: 2 NOV 2011 | DOI: 10.1002/polb.22383

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      Nafion films doped with Mn2+, Fe2+, Co2+, or Fe3+ paramagnetic ions, with and without triazole treatment are studied; doping of Nafion with Fe2+ and Co2+ with triazole treatment yields a hybrid self-assembling paramagnetic system. It is suggested that paramagnetic ions are located inside the nanoscale cylinders in the Nafion matrix, forming self-assembling magnetically and optically active networks.

    5. Controllable photopatterning and photochemical properties of novel copolymer containing dianthracene langmuir–blodgett films (pages 139–147)

      Tiesheng Li, Wenjian Xu, Caiqin Tang, Min Zhang, Yangjie Wu and Tokuji Miyashita

      Article first published online: 31 OCT 2011 | DOI: 10.1002/polb.22389

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      The dimerization reaction and photodecomposition of novel copolymer containing swallow-tailed double anthryl groups LB films can be controlled by choosing not only a suitable irradiation light wavelength (365 nm or 248 nm), but the irradiation time at 248 nm. The exposed and unexposed regions of the especial copolymer irradiated at 248 nm have solubility differentiation in gold etchant (I2/NH4I/C2H5OH/H2O), the gold patterns with the maximal resolution of the used mask can be obtained easily without any development process.

    6. Two-photon excitation and optical limiting in polyfluorene derivatives (pages 148–153)

      Daniel S. Correa, Leonardo De Boni, Bruno Nowacki, Isabel Grova, Bruno D. Fontes, Paula C. Rodrigues, José R. Tozoni, Leni Akcelrud and Cleber R. Mendonça

      Article first published online: 31 OCT 2011 | DOI: 10.1002/polb.22390

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      Because of the high degree of conjugation along their backbone, large two-photon absorption cross sections as high as 3000 Göppert Mayer (1 GM = 1 × 10−50 cm4 s/photon) were measured for a new class of polyfluorene derivatives. Optical limiting and two-photon excited fluorescence also presented by the polymers, coupled with their film-forming ability, chemical stability, and electroluminescence, make them potential candidates for optical and photonics devices.

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