Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 49 Issue 20

15 October 2011

Volume 49, Issue 20

Pages i–iv, 1421–1491

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Full Papers
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      Cover Image, Volume 49, Issue 20 (pages i–ii)

      Version of Record online: 12 SEP 2011 | DOI: 10.1002/polb.22367

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      The introduction of inorganic nanoparticles into a polymer matrix to form dielectric polymer nanocomposites represents one of the most promising and exciting avenues to high-performance energy storage materials. By judiciously selecting a combination of polymer matrix and nanoparticles, the dielectric properties can be tuned and the energy density has been greatly improved in the polymer nanocomposites. In a Review on page 1421 of this issue, Qing Wang and Lei Zhu summarize a range of current approaches to dielectric polymer nanocomposites and conclude with a discussion of scientific issues that remain to be addressed as well as recommendations for future research.

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      Inside Cover, Volume 49, Issue 20 (pages iii–iv)

      Version of Record online: 12 SEP 2011 | DOI: 10.1002/polb.22368

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      On page 1464, M. Asai, Y. Yamaki, S. Takahashi, and Y. Koike present the fabrication of PMMA–BPT based graded index plastic optical fibers (GI-POFs) with low attenuation and high thermal stability for vehicle networks. The thermal stability of the GI-POFs is demonstrated to be as high as that of the commercially available step index POF. Moreover, the theoretical −3 dB bandwidth of the GI-POF could be estimated at over 4.0 GHz for the 50 m fiber. This novel GI-POF is shown to significantly increase the transmission speed of the networks.

  2. Reviews

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Full Papers
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      Polymer nanocomposites for electrical energy storage (pages 1421–1429)

      Qing Wang and Lei Zhu

      Version of Record online: 17 AUG 2011 | DOI: 10.1002/polb.22337

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      Polymer nanocomposites represent one of the most promising and exciting avenues for the development of dielectric materials with high energy densities for applications in advanced electronic devices and electric power systems. By judiciously selecting polymer matrix and nanoparticles and engineering organic–inorganic interfaces, the dielectric properties can be tuned and the energy density has been greatly improved in the polymer nanocomposites. This review presents an overview of the current strategies and general dielectric property–structure correlations.

  3. Full Papers

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Full Papers
    1. The effect of different stabilizers on the formation of self-assembled porous film via the breath-figure technique (pages 1430–1436)

      Masoud Amirkhani, Nicola Berger, Mohamed Abdelmohsen, Frank Zocholl, Manuel Rodrigues Gonçalves and Othmar Marti

      Version of Record online: 3 AUG 2011 | DOI: 10.1002/polb.22325

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      Breath-Figure is a simple technique used to produce polymer films with highly ordered honeycomb structures. The structure and morphology of the obtained porous films depend strongly on the experimental conditions. This article describes a systematic experiment conducted to evaluate the effect of different stabilizers on the patterns produced by this method. It is found that the choice of stabilizer affects the shape, regularity, and separation of pores, but does not affect their volume.

    2. Differences in water sorption and proton conductivity between Nafion and SPEEK (pages 1437–1445)

      Xuemei Wu, Xiaowen Wang, Gaohong He and Jay Benziger

      Version of Record online: 3 AUG 2011 | DOI: 10.1002/polb.22326

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      Of the two most popular electrolytes in use in polymer membrane fuel cells, Nafion has higher proton conduction at lower volume fraction of sulfonic acid groups than SPEEK. This is explained in this article in terms of the differences in the volume of mixing for water sorption and the proton conduction percolation between the two polymers, which in turns arise from different morphologies of the hydrophilic domains reflecting different coordination of the sulfonic acid groups.

    3. Structure evolution of α′-phase poly(lactic acid) (pages 1446–1454)

      Xiaolang Chen, Jeffrey Kalish and Shaw Ling Hsu

      Version of Record online: 9 AUG 2011 | DOI: 10.1002/polb.22327

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      Depending on processing conditions, PLA can exist in one of four crystalline forms. Most commercial samples use conditions that incorporate the newly discovered α′ phase. Varying the processing drawn ratio affects the crystallization behavior and phase evolution of the obtained films, but it is found that does not to cause the transformation of α′ phase crystals into α- or β-crystals.

    4. Predicting the proton conductivity of perfluorosulfonic acid membrane via combining statistical thermodynamics and molecular dynamics simulation (pages 1455–1463)

      Young Gyun Kim and Young Chan Bae

      Version of Record online: 9 AUG 2011 | DOI: 10.1002/polb.22328

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      The optimization of polymer electrolytes can be very difficult to achieve without the detailed understanding of the mechanism of proton transport in the membrane. This paper shows how the ionic conductivity behavior of an electrolyte membrane can be successfully predicted combining molecular dynamics simulations and statistical thermodynamic, without the aid of empirically adjusted model parameters.

    5. High-thermally stable and high-bandwidth graded index plastic optical fiber for vehicle networks (pages 1464–1469)

      Makoto Asai, Yasushi Yamaki, Satoshi Takahashi and Yasuhiro Koike

      Version of Record online: 9 AUG 2011 | DOI: 10.1002/polb.22329

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      Graded index plastic optical fibers (GI-POFs) yield great potential as high-speed transmission medium for data networks. Addition of dopants necessary during processing limits the thermal stability of these materials and thus hinders their industrial applications. Other dopant cause the GI-POF to have too high of attenuation to be used. This work achieves a route to GI-POFs with low-attenuation and high thermal stability by emphasizing the importance of the purity of the used dopant. Such GI-POFs can qualify for use in vehicle networks.

    6. On the origin of the “core-free” morphology in microinjection-molded HDPE (pages 1470–1478)

      Julien Giboz, Anne B. Spoelstra, Giuseppe Portale, Thierry Copponnex, Han E. H. Meijer, Gerrit W. M. Peters and Patrice Mélé

      Version of Record online: 17 AUG 2011 | DOI: 10.1002/polb.22332

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      Microparts (150-μm thick) of high-density polyethylene processed with microinjection molding present a core-free morphology, which differs in both orientation and crystalline states with that of a conventional part (1.5-mm thick). Highly oriented shish–kebabs are found throughout the micropart's thickness, whereas a main quiescent crystallized morphology is found for the conventional part. The results of this study highlight the key factors driving the final morphology of the polymer for the specific processing conditions.

    7. Phase behavior of SEBS triblock copolymer gels (pages 1479–1491)

      Tanya L. Chantawansri, Andrew J. Duncan, Jan Ilavsky, Kristoffer K. Stokes, Michael C. Berg, Randy A. Mrozek, Joseph L. Lenhart, Frederick L. Beyer and Jan W. Andzelm

      Version of Record online: 12 AUG 2011 | DOI: 10.1002/polb.22335

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      The control of the morphology of the composing block copolymer phase separation is the key to exactly tune properties in thermoplastic elastomer gels. Computer modeling allows to identify the critical parameters of morphology control, providing guidance to the synthesis efforts. Here, dynamic density functional theory is used to elucidate the effects of solvent concentration on the phase behavior of the morphology of a triblock copolymer forming a thermoplastic elastomer gel.

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