Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 49 Issue 5

1 March 2011

Volume 49, Issue 5

Pages 327–398

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
    5. Erratum
    1. You have free access to this content
      Cover Image, Volume 49, Issue 5 (pages i–ii)

      Version of Record online: 18 FEB 2011 | DOI: 10.1002/polb.22222

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      Polymeric ion-exchange membranes are widely used as proton-conductive separators in fuel cells. Ionomers – polymer chains with ion-exchange groups bound to them – are often used for these purposes, and the most famous and widely used is Nafion. In the search for more chemically and mechanically stable alternatives to Nafion, an understanding of the nanophase separation that ionomers undergo at different levels of hydration and the effects that this has on conductivity and other properties is vital. On page 368 of this issue, Elshad Allahyarov and Philip Taylor report simulation studies of equilibrium morphologies in low-water ionomers. Amongst other things, their simulation results indicate that it is possible to generate larger clusters in polymers with longer side chains. The increased flexibility of longer side chains also modestly improves proton diffusion through the membrane.

  2. Communication

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
    5. Erratum
    1. The toughness amplification map of poly(vinyl chloride) and its cellulose acetate-compatibilized starch alloys containing core/shell rubber particles: Possible transition to super-toughening (pages 327–332)

      A. M. Pourrahimi, N. Mohammadi and A. Javadi

      Version of Record online: 29 NOV 2010 | DOI: 10.1002/polb.22178

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      The toughness of PVC/starch blends, which are used to produce better biodegradable plastics, is improved by compatibilization using cellulose acetate followed by the addition of core–shell rubber particle. The obtained toughness amplification depends on the interfacial adhesion of the blend components, the impact modifier performance, and the impact test temperature and speed.

  3. Full Papers

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
    5. Erratum
    1. A novel high-contrast ratio electrochromic material from spiro[cyclododecane-1,9′-fluorene]bicarbazole (pages 333–341)

      Ozlem Usluer, Sermet Koyuncu, Serafettin Demic and René A. J. Janssen

      Version of Record online: 7 DEC 2010 | DOI: 10.1002/polb.22190

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      Carbazole-based polymers are useful for making electrochromic devices because of their good stability. However, they tend to be limited by low contrast ratio between oxidized and reduced forms and slower response times than other electrochromic polymers. Here, an electrochromic polymer with high contrast ratio was obtained from a novel spirofluorene monomer and used to construct an electrochromic device with a short response time of about 1 sec, and high redox stability and coloration efficiency.

    2. Water-disintegrative and biodegradable blends containing poly(L-lactic acid) and poly(butylene adipate-co-terephthalate) (pages 342–354)

      Hideko T. Oyama, Yoshikazu Tanaka, Sakiko Hirai, Shigenari Shida and Ayako Kadosaka

      Version of Record online: 8 DEC 2010 | DOI: 10.1002/polb.22193

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      Poly(lactic acid) is of great interest as an environmentally friendly polymer, as it is derived from renewable resources and it degrades to nontoxic compounds. Unfortunately, its inherent brittleness and low impact strength, coupled with its very slow nonenzymatic degradation rate in water, soil, and the human body, have limited its applications. Here, blending with another polymer produces a biodegradable material with excellent mechanical properties, which hardly degrades during handling or storage in air, but rapidly disintegrates in water.

    3. Fracture of model polyurethane elastomeric networks (pages 355–367)

      Antonella Cristiano, Alba Marcellan, Bert J. Keestra, Paul Steeman and Costantino Creton

      Version of Record online: 7 DEC 2010 | DOI: 10.1002/polb.22186

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      Understanding the mechanism of fracture of rubbers is of prime technological interest, especially for the tyre industry. Fracture experiments on nearly defect free, well-defined model Polyurethane rubbers show that entanglements toughen the rubber networks while the presence of short chains embrittle them. Fracture toughness is dominated by the network structure rather than by viscoelastic dissipation.

    4. Simulation study of the equilibrium morphology in ionomers with different architectures (pages 368–376)

      Elshad Allahyarov and Philip L. Taylor

      Version of Record online: 3 JAN 2011 | DOI: 10.1002/polb.22191

      Thumbnail image of graphical abstract

      Polymeric ion-exchange membranes have application as proton-conductive separators in fuel cells. Ionomers, consisting of ion-exchange groups, often sulfonate, bound to a backbone chain, are an important class of these polymers. Molecular dynamics simulations explain how the ionomer architecture, identified in terms of the respective lengths of the side-chain and backbone segments, affects the shape of the hydrophilic network of sulfonate clusters and thus the proton diffusion through low-water membranes.

    5. Retracted: Effects of nanoparticles to the dynamical behavior of polymer chains in semidilute polymer solution: A dynamic light scattering study (pages 377–383)

      Mojammel H. Mondal

      Version of Record online: 18 JAN 2011 | DOI: 10.1002/polb.22194

      The following article from the Journal of Polymer Science Part B: Polymer Physics: “Effects of nanoparticles to the dynamical behavior of polymer chains in semidilute polymer solution: A dynamic light scattering study,” by Mojammel H. Mondal, published online on 18 January 2011 in Wiley Online Library (onlinelibrary.wiley.com), has been retracted by agreement between the author, the journal Managing Editor, Dr. Victoria Cleave, and Wiley-Blackwell. The retraction has been made as the research article was submitted without the author's PhD supervisor and principal investigator's knowledge or consent.

    6. Characteristics of several kinds of polyethylene gel estimated by small-angle light scattering under cross polarization (pages 384–397)

      Yanling Luo, Seiko Kayakabe, Ying Xi, Yuezhen Bin, Chunye Xu and Masaru Matsuo

      Version of Record online: 5 OCT 2010 | DOI: 10.1002/polb.22166

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      Small-angle light scattering can be used to study the structure of polymer gels and networks, but interpreting the patterns has been a complex task. Here, polyethylene gel scattering patterns are studied and modeled using a statistical approach and 3D optically anisotropic elements. As a result, the patterns could be interpreted as the correlation between polar and rotational angles of two optically anisotropic elements in the polymer-rich phase of the gels.

  4. Erratum

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
    5. Erratum
    1. You have free access to this content
      Flow-induced particle orientation and rheological properties of suspensions of organoclays in thermoplastic resins (page 398)

      Mahmoud Rajabian, Ghasem Naderi, Pierre J. Carreau and Charles Dubois

      Version of Record online: 26 JAN 2011 | DOI: 10.1002/polb.22188

      This article corrects:

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