Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 50 Issue 11

1 June 2012

Volume 50, Issue 11

Pages 1–811

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    1. You have free access to this content
      Cover Image, Volume 50, Issue 11 (page 1)

      Article first published online: 20 APR 2012 | DOI: 10.1002/polb.23092

      Thumbnail image of graphical abstract

      A polyimide supported gold interconnect is one of the major candidates for realization of stretchable and curvilinear electronics featuring high reliability and biocompatibility. As presented by A. Jahanshahi, P. Salvo, and J. Vanfleteren on page 773, the track stress under elongation can be minimized by decreasing the track width, while multiple tracks can be fabricated parallel to each other to prevent high resistance. Four 20-lm-wide polyimide supported gold tracks are patterned in a horseshoe design on top of a commercial copper foil. These tracks can withstand 200,000 cycles of 30% elongation without any resistance variation. Various maximum elongations and maximum stress levels can be conveniently achieved by changing themeander design parameters.

  2. Reviews

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    1. You have free access to this content
      Molecular and nanoscale factors governing pressure-sensitive adhesion strength of viscoelastic polymers (pages 739–772)

      Mikhail M. Feldstein and Ronald A. Siegel

      Article first published online: 25 MAR 2012 | DOI: 10.1002/polb.23065

      Thumbnail image of graphical abstract

      Innovative pressure-sensitive adhesives (PSAs) with tailored performance properties can be produced by blending nontacky polymers such as high molecular weight poly(N-vinyl pyrrolidone) and oligomeric poly(ethylene glycol) (PVP-PEG). In the PVP-PEG system, a self-assembling hydrogen bonded stoichiometric network is formed, and pressure-sensitive adhesion results from a compromise between two normally conflicting factors: high intermolecular cohesion and relatively large free volume. Comparing results obtained with the PVP-PEG model PSA and with classic adhesives of different chemical compositions demonstrates that conclusions drawn for the model PVP-PEG PSAs may have universal significance.

  3. Communications

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    1. Reliable stretchable gold interconnects in biocompatible elastomers (pages 773–776)

      A. Jahanshahi, P. Salvo and J. Vanfleteren

      Article first published online: 30 MAR 2012 | DOI: 10.1002/polb.23064

      Thumbnail image of graphical abstract

      Stretchable electrical interconnects are vital components in applications such as medicaldevices, energy harvesting, and sensors. In this work, a new and economical method for the fabrication of highly reliable stretchable interconnects is introduced. The interconnects can be composed of gold single conducting tracks or multiple conducting tracks, which are placed parallel to each other and embedded in biocompatible elastomers, creating interconnects capable of 100 k cycles at 40% elongation.

  4. Full Papers

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    1. Biodegradable thermoset shape-memory polymer developed from poly(β-amino ester) networks (pages 777–789)

      Nishant Lakhera, Christopher M. Laursen, David L. Safranski and Carl P. Frick

      Article first published online: 28 FEB 2012 | DOI: 10.1002/polb.23059

      Thumbnail image of graphical abstract

      Biodegradable shape-memory polymers (SMPs) are of interest for biomedical applications such as sutures and stents. Here, a tailorable biodegradable thermoset SMP network was made using poly(β-amino ester) as the crosslinker. Poly(β-amino ester) has already been used for biomedical applications and is nontoxic and biocompatible. By adding an appropriate amount of methyl methacrylate and methyl acrylate to poly(β-amino ester), two SMP networks were developed that were shown to have good thermo-mechanical, shape recovery, and degradation characteristics.

    2. Electro-conductive double-network hydrogels (pages 790–796)

      Ryoichi Kishi, Kazuaki Hiroki, Taiki Tominaga, Ken-Ichi Sano, Hidenori Okuzaki, Jose G. Martinez, Toribio F. Otero and Yoshihito Osada

      Article first published online: 23 MAR 2012 | DOI: 10.1002/polb.23066

      Thumbnail image of graphical abstract

      In order for hydrogels to be used in applications such as electro-driven actuators and artificial muscles, they must have good mechanical strength and also be electrically conductive. In this work, novel electro-conductive and mechanically-tough double network hydrogels (E-DN gels) are synthesized by polymerization of 3, 4-ethylenedioxythiophene in the presence of a double network hydrogel (DN gel) matrix. Poly(3, 4-ethylenedioxythiophene) incorporated into the DN gel matrix greatly improves not only electronic conductivity, but also mechanical properties, reinforcing the DN gel.

    3. Central small-angle diffuse scattering from fibers is made of two components (pages 797–804)

      Wenjie Wang, N. Sanjeeva Murthy and David T. Grubb

      Article first published online: 4 APR 2012 | DOI: 10.1002/polb.23068

      Thumbnail image of graphical abstract

      Small-angle x-ray scattering (SAXS) patterns can provide a plethora of information about polymer structure and morphology. SAXS and neutron scattering from materials with fibrous texture are generally characterized by a central diffuse scattering that is either diamond-shaped or shaped like a two-bladed propeller. The central scattering from fibers of polyacrylonitrile, nylon, and PET – and in particular the changes seen during deformation and heating – have been examined. Fitting a wider range of full patterns shows that a good fit and a consistent description requires two scattering components.

    4. Electro-osmotic flow in nanochannels with voltage-controlled polyelectrolyte brushes: Dependence on grafting density and normal electric field (pages 805–811)

      Qianqian Cao, Chuncheng Zuo, Lujuan Li, Yinhe Zhang and Guang Yan

      Article first published online: 2 APR 2012 | DOI: 10.1002/polb.23069

      Thumbnail image of graphical abstract

      Smart regulation of nanochannels is crucial for the construction of lab-on-a-chip devices. Electro-osmotic flow can be modulated by electric field-responsive polyelectrolyte brushes grafted on the surface of the channel. Varying the field normal to the grafting surface leads to a stretching/shrinkage conformational transition of the polyelectrolyte brush and a rearrangement of cations and anions. The flux and the brush thickness exhibit different dependence on the grafting density under different electric fields (including direction and magnitude of the field).

SEARCH

SEARCH BY CITATION