Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 52 Issue 9

1 May 2014

Volume 52, Issue 9

Pages i–iv, 611–675

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Communications
    4. Full Papers
    1. You have free access to this content
      Cover Image, Volume 52, Issue 9 (pages i–ii)

      Version of Record online: 25 MAR 2014 | DOI: 10.1002/polb.23477

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      The cover shows the configuration of the ULTEM thermoplastic polyimide obtained with full atomic molecular dynamics (MD) simulations on a microsecond timescale. The comparative study of the electrostatic interactions' influence on the thermophysical and structural properties of the ULTEM and EXTEM polyimides carried out using MD simulations is reported by Stanislav G. Falkovich, Sergey V. Lyulin, Victor M. Nazarychev, Sergey V. Larin, Andrey A. Gurtovenko, Natalia V. Lukasheva, and Alexey V. Lyulin on page 640 (DOI: 10.1002/polb.23460).

    2. You have free access to this content
      Cover Image, Volume 52, Issue 9 (pages iii–iv)

      Version of Record online: 25 MAR 2014 | DOI: 10.1002/polb.23478

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      The emerging challenges in the manufacture of polymer nanocomposites shed light on the development of new reinforcements, as presented by Yu Dong, Tariq Mosaval, Hazim J. Haroosh, Rehan Umer, Hitoshi Takagi, and Kin-Tak Lau on page 618 (DOI: 10.1002/polb.23467). Electrospun polylactic acid nanofibers demonstrate great potential due to their simple fabrication process via electrospinning to produce continuous, nondestructive, well-bonded fibrous structures. Such structures enhance the mechanical and thermal properties by acting as effective fillers, and may potentially alleviate the failure resulting from large voids, which is a critical manufacturing defect in processing epoxy composites.

  2. Communications

    1. Top of page
    2. Cover Image
    3. Communications
    4. Full Papers
    1. Progressive transition from resonant to diffuse reflection in anisotropic colloidal films (pages 611–617)

      Roy Rotstein, Samir Mitragotri, Martin Moskovits and Daniel E. Morse

      Version of Record online: 13 FEB 2014 | DOI: 10.1002/polb.23458

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      Although disordered photonic materials do not possess sharp reflection bands exhibited by highly ordered photonic crystals, they are nonetheless of high interest to the optics community. In this work, disordered thin films comprising polystyrene rod-shaped colloidal particles are synthesized. A transition from resonant reflection to diffuse reflection is observed as the particle aspect ratio is increased, demonstrating that the onset of diffuse reflection is governed by particle size.

    2. The potential use of electrospun polylactic acid nanofibers as alternative reinforcements in an epoxy composite system (pages 618–623)

      Yu Dong, Tariq Mosaval, Hazim J. Haroosh, Rehan Umer, Hitoshi Takagi and Kin-Tak Lau

      Version of Record online: 28 FEB 2014 | DOI: 10.1002/polb.23467

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      The emerging challenges in the manufacture of polymer nanocomposites have resulted in the development of new reinforcements. Among these, electrospun polylactic acid (PLA) nanofibers demonstrate great potential due to their simple fabrication process via electrospinning to produce continuous, nondestructive, and well-bonded fibrous structures. Such fibers provide enhanced mechanical and thermal properties as effective fillers in epoxy/electrospun PLA nanofiber composites.

  3. Full Papers

    1. Top of page
    2. Cover Image
    3. Communications
    4. Full Papers
    1. The effect of water content on chain dynamics in nafion membranes measured by neutron spin echo and dielectric spectroscopy (pages 624–632)

      Kirt A. Page, Brandon W. Rowe, Kevin A. Masser and Antonio Faraone

      Version of Record online: 17 FEB 2014 | DOI: 10.1002/polb.23457

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      Water and polymer dynamics play a critical role in the performance and durability of membrane materials in operating hydrogen fuel cells. Using neutron spin echo and dielectric spectroscopy, a strong dependence of the polymer chain dynamics on the amount of water present in the system is demonstrated, including a strong coupling between the water transport and the polymer segmental dynamics at low water contents.

    2. Viscoelastic modeling of nanoindentation experiments: A multicurve method (pages 633–639)

      Meiyu Zhai and Gregory B. McKenna

      Version of Record online: 11 MAR 2014 | DOI: 10.1002/polb.23470

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      Nanoindentation is an increasingly used method of extracting the surface mechanical properties of viscoelastic materials, especially polymers. Here, using a viscoelastic analysis for the indentation test, the material functions can be extracted from the indentation loading curves, either at a constant loading rate or a constant indentation rate. Simultaneously fitting indentation tests covering several different indentation rates gives a better determination of the relaxation modulus or creep compliance than a single curve analysis does.

    3. Influence of the electrostatic interactions on thermophysical properties of polyimides: Molecular-dynamics simulations (pages 640–646)

      Stanislav G. Falkovich, Sergey V. Lyulin, Victor M. Nazarychev, Sergey V. Larin, Andrey A. Gurtovenko, Natalia V. Lukasheva and Alexey V. Lyulin

      Version of Record online: 24 FEB 2014 | DOI: 10.1002/polb.23460

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      Polyimides are popular as high-performance materials because they are lighter metals having comparable toughness and thermal resistance. Even tiny modifications in the chemical structure can significantly influence the physical properties, but experimental data cannot yet predict the primary influences of modifications on the materials' properties. Here, two industrial thermoplastics that contain the same dianhydride fragments but different diamine fragments are computationally investigated. The difference in diamines leads to noticeable differences in the thermophysical properties.

    4. Experimental clues of soft glassy rheology in strained filled elastomers (pages 647–656)

      Françoise Ehrburger-Dolle, Isabelle Morfin, Françoise Bley, Frédéric Livet, Gert Heinrich, Luc Piché and Mark Sutton

      Version of Record online: 27 FEB 2014 | DOI: 10.1002/polb.23463

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      This study is devoted to the analysis of the behavior of the tensile relaxation modulus of a series of cross-linked filled elastomers at a given strain level reached either by a positive or a negative strain step. The relevance of the soft glassy rheology model is examined, and it is suggested that the decrease of the power law exponent α reveals a decrease of the polymer chain mobility, providing experimental clues for soft glassy rheology features in strained filled elastomers.

    5. Syndiotactic polystyrene films with a cocrystalline phase including carvacrol guest molecules (pages 657–665)

      Alexandra R. Albunia, Paola Rizzo, Graziella Ianniello, Claudia Rufolo and Gaetano Guerra

      Version of Record online: 24 FEB 2014 | DOI: 10.1002/polb.23464

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      Cocrystalline films of syndiotactic polystyrene with a relevant natural antimicrobial guest molecule such as carvacrol, being prevalent in the crystalline phase even up to 10–11 wt % have been prepared. These films show a decrease of apparent carvacrol diffusivity of two to three orders of magnitude with respect to the desorption from the amorphous phase, and hence they assure a slow antimicrobial release and long-term antimicrobial properties.

    6. Stiffness quantification of conductive polymers for bioelectrodes (pages 666–675)

      Rachelle T. Hassarati, Josef A. Goding, Sungchul Baek, Alexander J. Patton, Laura A. Poole-Warren and Rylie A. Green

      Version of Record online: 26 FEB 2014 | DOI: 10.1002/polb.23465

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      Conductive polymers have been explored as coatings for electrodes, which offer a softer and rougher interface for improved cell interactions. However, due to limitations of analytical techniques and the substrate-dependent nature of electrodeposited conductive polymers, there is very little information quantifying their physico-mechanical properties. To address this knowledge gap, peak-force quantitative nanomechanical mapping atomic force microscopy has been applied and values for conductive polymer elastic moduli are presented under both dry and hydrated conditions.

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