Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 51 Issue 9

1 May 2013

Volume 51, Issue 9

Pages i–ii, 699–773

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    6. Erratum
    1. You have free access to this content
      Cover Image, Volume 51, Issue 9 (pages i–ii)

      Article first published online: 19 MAR 2013 | DOI: 10.1002/polb.23287

      Thumbnail image of graphical abstract

      Crystal needles of small molecules embedded in a polymer film are produced by spin-coating the blend solution of PFO and EPPTC in chloroform onto a glass substrate, as presented by Xinping Zhang, Fei Dou, and Hongmei Liu on page 749. Microscopic characterization shows controllable sizes of the crystal needles with changing the spincoating speed. The spatial mapping of the near-field PL spectrum shows new emission on the heterointerface between the PFO and the EPPTC molecules on the outer shells of the crystal needles. The new spectral feature is resolved between the intrinsic emission of individual molecules and pure aggregates of EPPTC and exhibits a rather long lifetime. This results from the formation of charge-transfer states as electrons transfer from PFO to the H-aggregated EPPTCmolecules.

  2. Reviews

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    3. Reviews
    4. Communications
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      Ionic electroactive polymer metal composites: Fabricating, modeling, and applications of postsilicon smart devices (pages 699–734)

      Viviana De Luca, Paolo Digiamberardino, Giovanna Di Pasquale, Salvatore Graziani, Antonino Pollicino, Elena Umana and Maria Gabriella Xibilia

      Article first published online: 5 MAR 2013 | DOI: 10.1002/polb.23255

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      Ionic polymer-metal composites (IPMCs) are materials with electromechanical transduction capabilities that are relevant to the realization of future postsilicon smart systems. Their sensing, power harvesting, and actuation properties make them ideal for a variety of technological applications. In this Review, the three main aspects of this new technology—fabrication methods, modeling, and applications—are discussed, focusing on the evolution of IPMC research toward the realization of smart systems.

  3. Communications

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    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    6. Erratum
    1. Characterizing polymer macrostructures by identifying and locating microstructures along their chains with the kerr effect (pages 735–741)

      S. N. Hardrict, R. Gurarslan, C. J. Galvin, H. Gracz, D. Roy, B. S. Sumerlin, J. Genzer and A. E. Tonelli

      Article first published online: 29 JAN 2013 | DOI: 10.1002/polb.23248

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      The electrical birefringence, or Kerr effect, contributed by polymer solutes to their dilute solutions is sensitive enough to determine their macrostructures. Using specially designed styrene/p-bromostyrene copolymers, it is observed that their molar Kerr constants are not only sensitive to the types and amounts of their constituent microstructures but also to their locations along the copolymer chains. Comparison of molar Kerr constants calculated for a variety of macrostructures to those observed permitted, forthe first time, identification of the appropriate macrostructures.

  4. Full Papers

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    6. Erratum
    1. Nucleation of hydroxyapatite crystals by self-assembled Bombyx mori silk fibroin (pages 742–748)

      Mingying Yang, Wen He, Yajun Shuai, Sijia Min and Liangjun Zhu

      Article first published online: 29 JAN 2013 | DOI: 10.1002/polb.23249

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      The mechanically robust properties of silk fibroin (SF) have prompted numerous investigations into its potential in biomaterials and scaffolds for tissue engineering. To prove that Bombyx mori SF mediates the nucleation of hydroxyapatite crystals (HAps) by its molecular self-assembly, atomic force microscopy observation of a co-solution of SF and simulated body fluid (SBF) indicated that SF incubated in SBF was self-assembled into a net, suggesting that nucleation of HAps of SF was controlled by its molecular self-assembly.

    2. Charge-transfer complex coupled between polymer and H-aggregate molecular crystals (pages 749–755)

      Xinping Zhang, Fei Dou and Hongmei Liu

      Article first published online: 13 FEB 2013 | DOI: 10.1002/polb.23272

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      Charge transfer states form on the interface between excited polymer molecules and indirectly excited H-aggregates in the complex film of poly(9,9-di-n-hexylfluorenyl-2,7-diyl) (PFO) embedded with N, N′'-bis(1-ethylpropyl)-3,4,9,10-perylenebis(dicarboximide) (EPPTC) crystals, where PFO functions as the electron donor and EPPTC aggregates as the acceptor. The charge-transfer-exciton emission is identified by its long lifetime and the spectral feature between the intrinsic emission of individual EPPTC molecules and their pure aggregates, which is verified further by the near-field spectroscopic measurements.

    3. Confinement mechanism of electrospun polymer nanofiber reinforcement (pages 756–763)

      Arkadii Arinstein

      Article first published online: 24 JAN 2013 | DOI: 10.1002/polb.23246

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      The sharp increase in elastic modulus of electrospun polymer nanofibers with decrease in their diameters is a well-known and widely accepted phenomenon. Nevertheless, up to now, the physical reasons resulting in the above size-dependent behavior are unclear. The proposed explanation is based on the confinement concept. A manifesting mechanism of the confinement effect that provides the size-dependent elastic modulus of electrospun polymer nanofibers is discussed. The obtained theoretical results are in good agreement with the experimental data.

    4. Mechanistic model for deformation of polymer nanocomposite melts under large amplitude shear (pages 764–771)

      Erkan Senses and Pinar Akcora

      Article first published online: 24 JAN 2013 | DOI: 10.1002/polb.23247

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      Reinforced nanocomposites that are subject to frequent deformation should withstand repeated mechanical loadings for their applications as energy absorbing and high-impact resistant materials, therefore, it is very critical to predict their mechanical properties under large shear. Here, the nonlinear mechanical response of a model composite system, poly(styrene)-SiO2, is analyzed to reveal the elastic stress contributions from the particle network and polymer and explain their mechanical properties at a wide range of strain amplitudes.

  5. Erratum

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    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    6. Erratum
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      Corrigendum: Network structure and thermomechanical properties of hybrid DGEBA networks cured with 1-methylimidazole and hyperbranched poly(ethyleneimine)s (pages 772–773)

      Xavier Fernández-Francos, David Santiago, Francesc Ferrando, Xavier Ramis, Josep M. Salla, Àngels Serra and Marco Sangermano

      Article first published online: 25 JAN 2013 | DOI: 10.1002/polb.23254

      This article corrects:

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