Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 51 Issue 16

15 August 2013

Volume 51, Issue 16

Pages i–ii, 1195–1261

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Review
    4. Communication
    5. Full Papers
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      Cover Image, Volume 51, Issue 16 (pages i–ii)

      Article first published online: 3 JUL 2013 | DOI: 10.1002/polb.23336

      Thumbnail image of graphical abstract

      Accelerated degradation of polymer:fullerene solar cells at elevated temperatures due to phase separation is one of the main issues affecting their lifetime. On page 1209, F. Piersimoni et al. report a strong reduction of the polymer:fullerene phase separation upon exposure to light. The photo-stabilization is quite independent of the polymer and is attributed to the dimerization of fullerene induced via photochemical 2+2 cycloaddition reaction. The cover picture shows crystals of the fullerene PCBM in a matrix of rr-P3HT, observed in films heated at 110 °C without exposure to light.

  2. Review

    1. Top of page
    2. Cover Image
    3. Review
    4. Communication
    5. Full Papers
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      Nanoparticles as macromolecules (pages 1195–1208)

      Joseph B. Miller and Erik K. Hobbie

      Article first published online: 27 JUN 2013 | DOI: 10.1002/polb.23327

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      Beyond the similar scales of size, several key concepts from polymer physics—such as polydispersity, fractionation, phase ordering, and viscoelasticity—are taking on new significance in the contemporary realm of nanotechnology. This review looks at recent trends in the dispersion, purification, and assembly of colloidal nanoparticles and the analogies with ideas from polymer science, with potentially profound implications for some emerging technologies. The image shows simultaneous phase separation and drying in a nanocrystal–polymer solution.

  3. Communication

    1. Top of page
    2. Cover Image
    3. Review
    4. Communication
    5. Full Papers
    1. Influence of fullerene photodimerization on the PCBM crystallization in polymer: Fullerene bulk heterojunctions under thermal stress (pages 1209–1214)

      Fortunato Piersimoni, Giedrius Degutis, Sabine Bertho, Koen Vandewal, Donato Spoltore, Tim Vangerven, Jeroen Drijkoningen, Marlies K. Van Bael, An Hardy, Jan D'Haen, Wouter Maes, Dirk Vanderzande, Milos Nesladek and Jean Manca

      Article first published online: 20 JUN 2013 | DOI: 10.1002/polb.23330

      Thumbnail image of graphical abstract

      For an increased lifetime of polymer:fullerene bulk heterojunction solar cells, a thorough understanding of the factors that govern the morphological stability of the active layer blend under thermal stress is crucial. In this work, it is demonstrated that light exposure slows down fullerene crystallization and phase separation normally induced at elevated temperatures. The observed photostabilizing effect on active layer morphology is attributed to light-induced dimerization of the fullerene.

  4. Full Papers

    1. Top of page
    2. Cover Image
    3. Review
    4. Communication
    5. Full Papers
    1. Preparation of a solution-processable, nanostructured ionic polyacetylene (pages 1215–1227)

      Bryan Ringstrand, Sönke Seifert and Millicent A. Firestone

      Article first published online: 7 JUN 2013 | DOI: 10.1002/polb.23321

      Thumbnail image of graphical abstract

      An ionic liquid monomer that can be self-assembled and captured through transition metal initiated polymerization into a nanostructured, yet solution-processable, ionic polyacetylene is synthesized. The polymer is an ionic conductor and an electronic semiconductor, and its insolubility in water and resistance to oxidative degradation coupled with solution processability employing polar organic solvents makes it a viable material for potential use as a bioelectrode.

    2. Micromechanical characterization of the interphase layer in semi-crystalline polyethylene (pages 1228–1243)

      Akbar Ghazavizadeh, Gregory C. Rutledge, Ali A. Atai, Saïd Ahzi, Yves Rémond and Nasser Soltani

      Article first published online: 20 JUN 2013 | DOI: 10.1002/polb.23319

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      Stiffness tensor of the interphase layer, Cip, in semicrystalline polyethylene is determined for the first time by applying two micromechanical approaches to the atomistic simulation results of the interlamellar domain. It is revealed that Cip is not positive definite and consequently the interphase is mechanically unstable. For verification, another micromechanical approach is employed to estimate the interphase effective Young's modulus from Cip, which compares well with the experimentally determined interlamellar Young's modulus at high crystallinity.

    3. Phosphonated oligoallylamine: Synthesis, characterization in water, and development of layer by layer assembly (pages 1244–1251)

      Claire Negrell-Guirao, Federico Carosio, Bernard Boutevin, Hervé Cottet and Cédric Loubat

      Article first published online: 11 JUN 2013 | DOI: 10.1002/polb.23322

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      Layer by layer (LbL) assemblies have been used to produce new flame retardants with charged polymers. Oligoallylamines were obtained by radical polymerization and characterized by a new technique of capillary electrophoresis then alternatively coated with phosphonated oligoallylamines like original polymers with zwitterions functions. When combined using the LbL approach, assembled polymers exhibited an exponential growth; the final assembly showed an extraordinary thermal and thermo-oxidative stability.

    4. Modification of polyisoprene-block-poly(vinyl trimethylsilane) block copolymers via hydrosilylation and hydrogenation, and their gas transport properties (pages 1252–1261)

      Bahadir N. Gacal, Volkan Filiz, Sergey Shishatskiy, Sofia Rangou, Silvio Neumann and Volker Abetz

      Article first published online: 7 JUN 2013 | DOI: 10.1002/polb.23323

      Thumbnail image of graphical abstract

      Polyisoprene-block-poly(vinyl trimethylsilane) copolymers having different isoprene content are successfully modified via hydrosilylation and hydrogenation and characterized by proton nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, gel permeation chromatography, and thermogravimetric analysis. The modified block copolymers show higher permeabilities for O2 and H2 than the unmodified block copolymers, while maintaining similar O2/N2 and H2/N2 selectivities. The increase in permeability after modification is related to the changing chemical and repulsive interactions between blocks resulting in different morphology and the increasing fractional free volume.

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