Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 51 Issue 18

15 September 2013

Volume 51, Issue 18

Pages i–ii, 1329–1391

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
    1. You have free access to this content
      Cover Image, Volume 51, Issue 18 (pages i–ii)

      Article first published online: 5 AUG 2013 | DOI: 10.1002/polb.23355

      Thumbnail image of graphical abstract

      Electrospinning of a semi-dilute polymer solution can yield short nanofibers of sub-micrometer diameter. The short nanofiber shown on the cover is 500 nm in diameter and 30 μm in length, and has a bead-on-string structure. Identified by Israel Greenfeld and Eyal Zussman on page 1377 as the outcome of polymer entanglement loss caused by the strong extensional flow of electrospinning, short nanofibers are promising as compact, aligned, rigid nanostructures, with possible applications in tissue engineering, drug delivery, composite reinforcement, filtration, electrical and thermal conduction, and light amplification.

      Corrected by:

      Erratum: Erratum: Cover Image, Volume 51, Issue 18

      Vol. 51, Issue 22, 1656, Article first published online: 10 SEP 2013

  2. Communication

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
    1. Theoretical and experimental infrared spectra of hydrated and dehydrated Nafion (pages 1329–1334)

      Ian Kendrick, Adam Yakaboski, Erin Kingston, Jonathan Doan, Nicholas Dimakis and Eugene S. Smotkin

      Article first published online: 23 JUL 2013 | DOI: 10.1002/polb.23348

      Thumbnail image of graphical abstract

      Time-dependent Nafion IR spectra, during rigorous dehydration, show the disappearance of ∼1060 cm−1 and ∼970 cm−1 peaks concurrent with the emergence of peaks at ∼1409 cm−1 and ∼924 cm−1 while the local symmetry of the side-chain sulfonate ion exchange group transitions from C3V to C1. Theoretical spectra confirm that the above C3V and C1 pairs of group modes have substantial sulfonate group contributions to the normal mode generalized coordinates.

  3. Full Papers

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
    1. Rheology and phase behavior of thermo-reversible pentablock terpolymer hydrogel (pages 1335–1342)

      Yufeng Wu, Dingwei Zhu, Zanru Guo and Yujun Feng

      Article first published online: 10 JUL 2013 | DOI: 10.1002/polb.23343

      Thumbnail image of graphical abstract

      A novel thermo-reversible hydrogel is prepared by a pentablock terpolymer, poly(N-isopropylacrylamide)-b-poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide)-b-poly(N-isopropylacrylamide). This pentablock terpolymer hydrogel displays higher viscosity, rapid thermo-responsive behavior, and stronger gel strength than that of its triblock copolymer precursor. The rheological properties are related to the microstructure changes of the resulting hydrogel.

    2. A novel temperature-step method to determine the glass transition temperature of ultrathin polymer films by liquid dewetting (pages 1343–1349)

      Jinhua Wang and Gregory B. McKenna

      Article first published online: 15 JUL 2013 | DOI: 10.1002/polb.23344

      Thumbnail image of graphical abstract

      By floatation of a very thin polystyrene film on appropriate liquids and performing a sequential set of temperature steps, one obtains the Tg vs. film thickness response in a single experiment. Prior methods required individual tests on a single film thickness preparation, but the new method takes advantage of the fact that during film dewetting, the film thickens and the Tg consequently increases during the experiment. When creep ceases, this implies vitrification and creep can only be reinitiated by incrementing the temperature upwards.

    3. Structure of P3HT in the solid state (pages 1350–1354)

      Eliézer Fernando de Oliveira and Francisco Carlos Lavarda

      Article first published online: 4 JUL 2013 | DOI: 10.1002/polb.23338

      Thumbnail image of graphical abstract

      Poly(3-hexylthiophene) is a polymer widely used in organic photovoltaic devices. Discrepancies in information exist in the literature about its morphological structure in solution and in the solid state. Having conducted theoretical studies of the structure and optical absorption, it is concluded that P3HT is not planar, either in solution or in the solid state. However, the effective conjugation length in the solid state is similar to that of a planar chain.

    4. Preparation and characterization of nanometer-thin freestanding polymer foils for laser-ion acceleration (pages 1355–1360)

      Bastian Aurand, Bentsian Elkin, Lars-Oliver Heim, Bettina Lommel, Birgit Kindler, Marilena Tomut, Christian Rödel, Stephan Kuschel, Oliver Jäckel, Jakob Barz and Thomas Kuehl

      Article first published online: 4 JUL 2013 | DOI: 10.1002/polb.23340

      Thumbnail image of graphical abstract

      Laser-ion acceleration experiments require the use of appropriate targets or foils which can adequately absorb such high-intensity pulses. In this work, parylene-based foils of nanometer thickness are fabricated via a cost-effective and simple process, allowing the production of large-area targets for laser acceleration experiments in the regime of radiation pressure acceleration. Besides the remarkable mechanical stability compared to commonly used diamond-like carbon foils, a very homogeneous layer thickness and a small surface roughness have been achieved.

    5. Creation of biofunctionalized plasma polymerized allylamine gradients (pages 1361–1367)

      Dave Mangindaan, Wei-Hsuan Kuo, Hengky Kurniawan and Meng-Jiy Wang

      Article first published online: 4 JUL 2013 | DOI: 10.1002/polb.23341

      Thumbnail image of graphical abstract

      The creation of polymer surface gradients with varying amine and amide functionalities is important for promoting cell adhesion and growth and in improving biocompatibility of biomedical materials. A continuous amine functionalized gradient was prepared on a polypropylene film by applying diffusion controlled plasma polymerization using an allylamine precursor. The gradient showed a gradual evolution of water contact angle ranging from 15° to 90°, and mouse fibroblast cells responded distinctively on the as-prepared gradient with more than two-fold cells on the amine-rich end.

    6. Strain state of poly(N-isopropylacrylamide) in polystyrene-b-poly(N-isopropylacrylamide) block copolymers and binary blends with polystyrene (pages 1368–1376)

      Miguel Rosales-Guzmán, Roberto Alexander-Katz, Patricia Castillo-Ocampo, Alejandro Vega-Ríos and Angel Licea-Claveríe

      Article first published online: 11 JUL 2013 | DOI: 10.1002/polb.23342

      Thumbnail image of graphical abstract

      The self-assembly of PS-PNIPAM diblock copolymers and their blends with polystyrene were studied; the micrographs show hexagonally packed cylinders with a continuous (right) and discrete (left) PNIPAM phase. When PNIPAM is the continuous phase, a contraction of the PNIPAM blocks compared to their average unperturbed dimensions occurs, contrary to what is expected from the physics of self-assembly of block copolymers. In contrast, when PNIPAM is confined in a PS matrix, both blocks are highly extended.

    7. Polymer entanglement loss in extensional flow: Evidence from electrospun short nanofibers (pages 1377–1391)

      Israel Greenfeld and Eyal Zussman

      Article first published online: 17 JUL 2013 | DOI: 10.1002/polb.23345

      Thumbnail image of graphical abstract

      Electrospinning of a semi-dilute polymer solution can yield short nanofibers, 50 nm to 5 µm in diameter and 1 µm to 1 mm in length. Identified as the outcome of polymer entanglement loss caused by the strong extension, short nanofibers are promising as compact, aligned, rigid nanostructures. By tuning size and material, short nanofibers may find important applications in tissue engineering, drug delivery, composite reinforcement, filtration, electrical and thermal conduction, and light amplification.

SEARCH

SEARCH BY CITATION