Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 53 Issue 20

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. On the electron transfer through Geobacter sulfurreducensPilA protein

    Nikolai Lebedev, Syed Mahmud, Igor Griva, Anders Blom and Leonard M. Tender

    Article first published online: 3 SEP 2015 | DOI: 10.1002/polb.23809

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    This work investigates the transmission spectrum, coupling efficiency of the protein transmission bands to the electrodes, electron transfer (ET) paths, molecular orbital delocalization, and efficiency of current generation of Geobacter sulfurreducens PilA protein. Quantitative estimation indicates that ET through the PilA protein cannot occur by coherent ET, but suggests a sequential (incoherent) mechanism.

  2. Size of a polymer chain in an environment of quenched chains

    Sachin Shanbhag

    Article first published online: 3 SEP 2015 | DOI: 10.1002/polb.23808

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    In this work, bond-fluctuation model (BFM) simulations of chains in a matrix composed of frozen polymers are performed, and the variation of the radius of gyration as a function of chain length and matrix density is measured. The size of a polymer chain initially shrinks in an environment of frozen obstacles. As the density of obstacles increases beyond a certain point, the chain expands rapidly.

  3. Dynamics of water and sodium in gels under salt-induced phase transition

    Matan Mussel, Ella Wilczynski, Uzi Eliav, Jonathan Gottesman, Michal Wilk and Uri Nevo

    Article first published online: 2 SEP 2015 | DOI: 10.1002/polb.23810

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    Water and sodium dynamics are analyzed in gels along a salt-induced volume phase transition. The fluid is well described by two distinct populations: free and bound. Free population correlation time is similar to pure water even in highly compact gels, while bound population correlation time is 103 times higher. Bound water forms a single hydration layer around the polymers, regardless of the gel's volume. This indicates a fundamental difference between thermal- and ion-induced phase transition.

  4. Morphology re-entry in asymmetric PS-PI-PS' triblock copolymer and PS homopolymer blends

    Weichao Shi, Wei Li, Kris T. Delaney, Glenn H. Fredrickson, Edward J. Kramer, Christos Ntaras, Apostolos Avgeropoulos and Nathaniel A. Lynd

    Article first published online: 29 AUG 2015 | DOI: 10.1002/polb.23811

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    Morphology re-entry is reported in a series of PS-b-PI-b-PS' asymmetric triblock copolymer and PS homopolymer (hPS) blends, where PS and PS' are polystyrenes of different lengths and PI is poly(isoprene). For example, with increasing the hPS content, a morphology sequence from lamellae to PS hexagonal cylinders and back to lamellae could be clearly identified, where PS hexagonal cylinders re-enters the phase diagram unexpectedly. However, this morphology re-entry is absent in the theoretical SCFT phase diagram.

  5. Coatings with thermally switchable surface energy produced from poly(ethylene oxide)-poly(dimethylsiloxane) block copolymer films

    Raleigh L. Davis and Richard A. Register

    Article first published online: 28 AUG 2015 | DOI: 10.1002/polb.23806

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    Amphiphilic poly(ethylene oxide)-poly(dimethylsiloxane), PEO-PDMS, block copolymers are synthesized and employed as thermally switchable (hydrophilic vs. hydrophobic) coatings. Above the order-disorder transition temperature (TODT) the polymer chains form a disordered melt. Upon cooling through TODT in dry or wet air, either the hydrophobic (PDMS) or hydrophilic (PEO) block, respectively, presents at the surface. The effect is fully reversible; reheating above TODT erases the wetting behavior, which is again set by cooling in the appropriate environment.

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