Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 53 Issue 22

15 November 2015

Volume 53, Issue 22

Pages i–ii, 1559–1628

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      Cover Image, Volume 53, Issue 22 (pages i–ii)

      Article first published online: 1 OCT 2015 | DOI: 10.1002/polb.23909

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      Nanosilica (NS) particles were found to be outstanding morphological stabilizers for immiscible PP-PA blends. They prevent coalescence regardless of the processing technique applied. Typical sea island morphologies are observed for 80/20 blends with average particle sizes close to 10 microns. NS addition creates a rigid barrier (observed by TEM) along the PP-PA interface that results in reductions of droplet sizes to values below 1 micron, as observed by SEM. While NS is an excellent morphological stabilizer, it cannot promote interfacial adhesion between immiscible PP and PA phases, as demonstrated by rheological measurements on page 1567 (DOI: 10.1002/polb.23786) by Alejandro J. Müller and coworkers.

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    1. Viscoelastic properties of ultrathin polycarbonate films by liquid dewetting (pages 1559–1566)

      Jinhua Wang and Gregory B. McKenna

      Article first published online: 27 AUG 2015 | DOI: 10.1002/polb.23807

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      In this work, the change in the glass transition temperature (Tg) as a function of film thickness for polycarbonate is investigated using a liquid dewetting technique and compared with literature reports for different methods. An obvious Tg reduction with decreasing film thickness was observed. The degree of Tg reduction is similar to results from the literature for PC films supported on rigid substrates.

    2. The outstanding ability of nanosilica to stabilize dispersions of Nylon 6 droplets in a polypropylene matrix (pages 1567–1579)

      Leire Sangroniz, Marco Antonio Moncerrate, Vladimir A. De Amicis, Jordana K. Palacios, Mercedes Fernández, Antxon Santamaria, Johan J. Sánchez, Fouad Laoutid, Philippe Dubois and Alejandro J. Müller

      Article first published online: 27 JUL 2015 | DOI: 10.1002/polb.23786

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      Nanosilica particles are excellent morphological stabilizers, effective in preventing coalescence regardless of the processing or post-processing technique involved. The silica nanoparticles create a rigid barrier along PP-PA interface that promotes a reduction in the droplet size and polydispersity. The increment in the non-linearity parameter Q measured under LAOS conditions evidences the interactions between nanosilica particles and the blend components.

    3. Interfacial constraints on water and proton transport across nafion membranes (pages 1580–1589)

      Jay B. Benziger, May Jean Cheah, Vaclav Klika and Michal Pavelka

      Article first published online: 17 AUG 2015 | DOI: 10.1002/polb.23794

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      Water and proton transport through ionomer membranes is essential to the operation of polymer electrolyte membrane fuel cells. This paper examines the thermodynamic and mass balance constraints of water and proton transport across Nafion membranes. Protons enter the Nafion membrane at the membrane/electrode interface while water enters the membrane at the membrane/vapor interface. Proton and water transport are correlated as they move through hydrophilic domains in the membrane. Proton and water transport are then decoupled as they leave the membrane at the cathode.

    4. Electrospinning-induced shape memory effect in thermoplastic polyurethane characterization and thermoviscoelastic modeling (pages 1590–1602)

      Dimitry Alhazov, Charly Azra and Eyal Zussman

      Article first published online: 17 AUG 2015 | DOI: 10.1002/polb.23799

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      This work investigates the massive contraction and shape memory capabilities of electrospun thermoplastic polyurethane nanofibers. Investigating the origin of the shape memory effect and strain retention at room temperature, neat films were studied as a model system due to the irrelevancy of the confinement effect. The heterogeneous mixture of soft and hard segment phases caused a large number of relaxation modes, covering both very short and very long relaxation times, which lead to the unexpected experimental observation.

    5. Transient bioelectronics: Electronic properties of silver microparticle-based circuits on polymeric substrates subjected to mechanical load (pages 1603–1610)

      Reihaneh Jamshidi, Simge Çinar, Yuanfen Chen, Nastaran Hashemi and Reza Montazami

      Article first published online: 27 AUG 2015 | DOI: 10.1002/polb.23804

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      Transient soft bioelectronics are fabricated and characterized for their electronic attributes when subjected to external mechanical force. Effects of magnitude and frequency of strain on electrical properties of stretchable bioelectronics are studied and reported. Also, transiency behavior of bioelectronics is characterized and analyzed as a function of the degradation attributes of substrates.

    6. Size of a polymer chain in an environment of quenched chains (pages 1611–1619)

      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.

    7. Dynamics of water and sodium in gels under salt-induced phase transition (pages 1620–1628)

      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.