Journal of Polymer Science Part B: Polymer Physics

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Online ISSN: 1099-0488

Associated Title(s): Journal of Polymer Science Part A: Polymer Chemistry

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Publishes papers on the physics of polymers, including applications, theory and modeling and experiments. 2013 ISI Impact Factor: 3.803.

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  1. Degradation mechanisms of polyfluorene-based organic semiconductor lasers under ambient and oxygen-free conditions

    Philipp Brenner, Lena-Maria Fleig, Xin Liu, Alexander Welle, Stefan Bräse and Uli Lemmer

    Article first published online: 16 APR 2015 | DOI: 10.1002/polb.23733

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    The degradation mechanisms of polyfluorenes in organic laser devices are investigated with various analytical methods. Incorporation of an increasing amount of benzothiadiazole units within the conjugated polymer decreases the rate of photo-oxidation. Chain scission and cross-linking is observed during degradation in an oxygen-free condition and might also be the dominant degradation factor in air.

  2. “Green polyethylene” and Curauá Cellulose nanocrystal based nanocomposites: Effect of vegetable oils as coupling agent and processing technique

    Daniele Oliveira de Castro, Elisabete Frollini, Adhemar Ruvolo-Filho and Alain Dufresne

    Article first published online: 11 APR 2015 | DOI: 10.1002/polb.23729

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    An investigation of the state of the art of polymer science dealing with renewable resources reveals a boom of research activities worldwide. In this context, the aim of the present work was to contribute to the development of materials that release less CO2 into the atmosphere during their production. In this work, seeking to improve the performance of biopolyethylene nanocomposites reinforced with curauá cellulose nanocrystals, vegetable oils were added to the matrix as a coupling agent.

  3. Fluorene-based rib waveguides with optimized geometry for long-term amplified spontaneous emission stability

    Gonzalo Del Pozo, Noureddine Bennis, Xabier Quintana, Jose Manuel Otón, Jinyi Lin, Linghai H. Xie, Qi Wei, Ruidong Xia, Ramon Bernardo-Gavito, Daniel Granados and Juan Cabanillas-Gonzalez

    Article first published online: 11 APR 2015 | DOI: 10.1002/polb.23730

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    Long-term operation of blue emitting polyfluorene-based optical amplifiers is compromised by their relatively low photostability. In this work, rib waveguides based on different fluorene-based compounds with different side-chain substituents are developed. A nine-fold reduction in energy fluence threshold for amplified spontaneous emission (ASE) is observed with respect to thin films, which is associated to confinement and enhanced waveguiding properties. Appropriate rib width optimization allows for a significant enhancement in ASE stability.

  4. Relation between stress and segmental orientation during mechanical cycling of a natural rubber-based compound

    Maha Zaghdoudi, Pierre-Antoine Albouy, Zoubeir Tourki, Arnaud Vieyres and Paul Sotta

    Article first published online: 11 APR 2015 | DOI: 10.1002/polb.23723

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    Molecular orientation is the origin of most of the retraction force in elastomers. The orientation extent at moderate elongation may be characterized by a single parameter. It is shown that a precise measure of the anisotropy of X-ray diffraction patterns allows an evaluation of this parameter during mechanical cycling. Its relation to stress presents some deviations from the expected linear behavior.

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    Entanglements in P3HT and their influence on thin-film mechanical properties: Insights from molecular dynamics simulations

    Naga Rajesh Tummala, Chad Risko, Christopher Bruner, Reinhold H. Dauskardt and Jean-Luc Brédas

    Article first published online: 8 APR 2015 | DOI: 10.1002/polb.23722

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    Conjugated polymers are active materials in many new technologically important applications and poly(3-hexyl thiophene) is an extensively studied, prototypical conjugated material. However, molecular level details of entanglement properties, modulus, and fracture of P3HT films, which are important for robust device manfucturing are not completely known. Here, using molecular dynamics simulations, such mechanical properties of P3HT are quantified and the influence of molecular weight on the entanglement properties of the polymer is studied.