Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 51 Issue 23

1 December 2013

Volume 51, Issue 23

Pages i–ii, 1657–1726

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      Cover Image, Volume 51, Issue 23 (pages i–ii)

      Article first published online: 23 OCT 2013 | DOI: 10.1002/polb.23401

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      Block copolymer (BCP) based polymer solar cells are potentially more stable than blend based systems as they have a distinct equilibrium nanostructure, which is determined by the polymer architecture and the block interactions. BCPs could be used to produce organic solar cells with consistent efficiency and device properties, largely unaffected by the choice of processing conditions. On page 1705, Chao Yan et al. study a triblock copolymer of PFM-F8BT-PFM using structural (grazing incidence scattering, as seen on the cover) and optical characterization techniques. The BCP has a device efficiency three times that of the blend. However the optical measurements show that the BCP exhibits exciplex emission and that the triplet yield is twenty times that of the blend. Both of these factors severely limit the device efficiency, but the potential of BCP based solar cells is clearly demonstrated.

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    1. Morphological investigation of polydisperse asymmetric block copolymer systems of poly(styrene) and poly(methacrylic acid) in the strong segregation regime (pages 1657–1671)

      Mehran Asad Ayoubi, Kaizheng Zhu, Bo Nyström, Ulf Olsson, Kristoffer Almdal, Alexei R. Khokhlov and Lennart Piculell

      Article first published online: 9 OCT 2013 | DOI: 10.1002/polb.23389

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      Study of the self-assembly characteristics of block copolymer systems featuring block polydispersity is a current research topic, as historically the focus has only been on those of the systems consisting of monodisperse blocks. Here, the effects of block polydispersity on compositionally highly asymmetric block copolymers of poly(styrene) and poly(methacrylic acid) in the strong segregation regime are investigated. In particular, the effects of block polydispersity on spherical microdomain size, the dissolution of the short blocks of one block into the other, and the possibility of obtaining spherical microdomains that are highly liquid crystalline are explored.

    2. Unique photoactive nanocomposites based on rhodamine 6G/polymer/montmorillonite hybrid systems (pages 1672–1679)

      Adriana Czímerová, Lubos Jankovič, Jana Madejová and Alexander Čeklovský

      Article first published online: 5 OCT 2013 | DOI: 10.1002/polb.23382

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      Encapsulation of photoactive molecules, such as organic dyes, into the galleries of various inorganic materials is of great interest for development of optical and photonic devices like tunable solid-state lasers, double-frequency crystals, and solar cells. Here, a hybrid inorganic–organic colloidal system is prepared in which H-aggregate formation is suppressed by adding poly(diallyldimethylammonium chloride) (PDDA). Suppressing aggregate formation enhances fluorescence yield from the composite, suggesting PDDA is an ideal surfactant to prepare highly fluorescent hybrid systems.

    3. Influence of talc with different particle sizes in melt-mixed LLDPE/MWCNT composites (pages 1680–1691)

      Michael Thomas Müller, Janine Dreyße, Liane Häußler, Beate Krause and Petra Pötschke

      Article first published online: 25 SEP 2013 | DOI: 10.1002/polb.23383

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      Linear low-density polyethylene was melt-mixed with multiwalled carbon nanotubes (MWCNTs) and varying amounts of three kinds of talc having different particle size distributions to examine the effect of these filler combinations with regard to electrical percolation behavior and filler dispersion. As more talc particles are present when using smaller talc particles, the rupture and erosion processes of the MWCNT agglomerates during the melt mixing are promoted and this leads to a decreased electrical percolation threshold.

    4. Hyperelastic characterization of the interlamellar domain and interphase layer in semicrystalline polyethylene (pages 1692–1704)

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

      Article first published online: 25 SEP 2013 | DOI: 10.1002/polb.23384

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      Hyperelastic constitutive properties of the interlamellar domain and its constituents (inter-phase + amorphous region) in semicrystalline polyethylene are successfully identified by applying constitutive relations of an isotropic, compressible, hyperelastic, neo-Hookean continuum to MD simulation results for a polyethylene stack. The presented analysis also captures the melting, recrystallization, and rotation of chains taking place during deformation. Similar methodologies can be implemented for the characterization of other constitutive properties when the relevant atomistic simulation data is available.

    5. Photophysics and morphology of a polyfluorene donor–acceptor triblock copolymer for solar cells (pages 1705–1718)

      Chao Yan, Ashley J. Cadby, Andrew J. Parnell, Weihua Tang, Maximilian W. A. Skoda, David Mohamad, Simon P. King, Luke X. Reynolds, Saif A. Haque, Tao Wang, Steven R. Parnell, Andrew B. Holmes, Richard A. L. Jones and David J. Jones

      Article first published online: 25 SEP 2013 | DOI: 10.1002/polb.23386

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      Polyfluorene (PFM)-based polymers are regularly used for organic electronics applications; this study examines the use of the PFM-based PFM-F8BT-PFM donor–acceptor triblock copolymer in organic photovoltaic (OPV) devices. The triblock copolymer exhibits exciplex emission, which necessitates a geminate polar pair; long-lived exciplex states are detrimental in OPVs. The triplet yield in the triblock and the blend is measured, with the triblock generating a triplet population twenty 20 times that of the blend.

    6. Fabrication and characterization of SiO2/PVDF composite nanofiber-coated PP nonwoven separators for lithium-ion batteries (pages 1719–1726)

      Meltem Yanilmaz, Chen Chen and Xiangwu Zhang

      Article first published online: 5 OCT 2013 | DOI: 10.1002/polb.23387

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      In lithium-ion batteries, separators are critically important for preventing electronic contact between electrodes while regulating cell kinetics and ionic flow. In this work, SiO2/polyvinylidene fluoride (PVDF) composite nanofiber-coated polypropylene (PP) nonwoven membranes were prepared by electrospinning. These multilayered composite membranes combine the good mechanical strength of PP nonwoven with the excellent electrochemical properties of SiO2/PVDF composite nanofibers, and they are demonstrated to be a promising separator candidate for next-generation, high-performance lithium-ion batteries.