Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 52 Issue 2

15 January 2014

Volume 52, Issue 2

Pages i–ii, 85–156

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Review
    4. Communication
    5. Full Papers
    1. You have free access to this content
      Cover Image, Volume 52, Issue 2 (pages i–ii)

      Article first published online: 1 DEC 2013 | DOI: 10.1002/polb.23430

      Thumbnail image of graphical abstract

      The cover image shows the spherulitic morphology of partially miscible PEG/PLA-co-CL 70:30 polymer blend after isothermal crystallizations conducted at 37 ° C. The diluting interfering effect of the copolymer on PEG crystallization is clearly visible. The typical Maltesecross pattern shown by pure PEG gives way to spherulites formed by crystal aggregates with a lower level of perfection when PLA-co-CL is incorporated into PEG, as presented by N. Hernandez-Montero, Jone M. Ugartemendia, Hegoi Amestoy, and J. R. Sarasua on page 111.

  2. Review

    1. Top of page
    2. Cover Image
    3. Review
    4. Communication
    5. Full Papers
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      Molecule motion at polymer brush interfaces from single-molecule experimental perspectives (pages 85–103)

      Shengqin Wang, Benxin Jing and Yingxi Zhu

      Article first published online: 22 NOV 2013 | DOI: 10.1002/polb.23414

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      Polymer brushes have specific molecular structures and are promising for uses such as functional coatings in biochips, medical implants, energy storage, and marine applications. Understanding the molecular dynamics at polymer brush interfaces is important in unraveling the structure–property relationships in these materials, and could aid to further broaden their applications in various industrial practices. Developments in the single-molecule level experimental explorations of the molecular dynamics at polymer brush interfaces are reviewed here.

  3. Communication

    1. Top of page
    2. Cover Image
    3. Review
    4. Communication
    5. Full Papers
    1. Memory chromic polyurethane with tetraphenylethylene (pages 104–110)

      You Wu, Jinlian Hu, Huahua Huang, Jie Li, Yong Zhu, Benzhong Tang, Jianping Han and Liangbin Li

      Article first published online: 23 OCT 2013 | DOI: 10.1002/polb.23399

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      Covalently connecting tetraphenylethylene units to the soft segments of polyurethane is shown to produce a material that demonstrates reversible and simultaneous mechano-, solvato-, and thermochromic shape memory effects. The barrier for rotation of the tetraphenylethylene clusters is governed indirectly by the deformation and shape of the polymer, linking the two properties to the stimuli applied. Given the dual shape memory and thermochromic properties of the polymer, applications such as biomedical devices, textiles, and different sensors are anticipated.

  4. Full Papers

    1. Top of page
    2. Cover Image
    3. Review
    4. Communication
    5. Full Papers
    1. Complex phase behavior and state of miscibility in Poly(ethylene glycol)/Poly(l-lactide-co-ε-caprolactone) Blends (pages 111–121)

      N. Hernandez-Montero, Jone M. Ugartemendia, Hegoi Amestoy and J. R. Sarasua

      Article first published online: 15 OCT 2013 | DOI: 10.1002/polb.23394

      Thumbnail image of graphical abstract

      The state of miscibility of polymer blends is important in the development of new polymeric materials. In poly(ethylene glycol)/poly(l-lactide-co-ε-caprolactone) blends, data from usual techniques such as DSC and PLOM alone are not sufficient for predicting whether their components are miscible, partially miscible, or fully immiscible. AFM images not only provide additional insight into the inner phase behavior, but are also helpful for estimating undetected glass transition temperatures of the composites when partial miscibility exists.

    2. Photovoltaic properties and femtosecond time-resolved fluorescence study of polyoxometalate-containing rod–coil diblock copolymers (pages 122–133)

      Yong Li, Lu Jin, Sanjiban Chakraborty, Shaohua Li, Peifen Lu, Da-Ming Zhu, Xingzhong Yan and Zhonghua Peng

      Article first published online: 16 OCT 2013 | DOI: 10.1002/polb.23396

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      The P3HT block length and the cluster loading ratio in polyoxometalate (POM)-containing hybrid rod–coil diblock copolymers (HDCPs) PS-Mo6-PTn significantly affect the extent and the type of interpolymer aggregation leading to drastically different exciton decay dynamics. Photovoltaic devices fabricated with the HDCPs show poor performances due to the inefficient photoinduced charge transfer from the P3HT block to the POM cluster as a result of no direct π-conjugation between them. An improved system addressing this issue is proposed.

    3. Enhancing heterogenous crystallization resistance in a bead-spring polymer model by modifying bond length (pages 134–140)

      Mark E. Mackura and David S. Simmons

      Article first published online: 20 OCT 2013 | DOI: 10.1002/polb.23398

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      Multiple studies have employed bead-spring models to study polymer glass formation, and recent efforts have aimed to employ these models to study nanoconfinement effects. The simulations in this work show that standard bead-spring models crystallize upon exposure to ordered walls, limiting their use in the study of nanoconfinement. Presented here is a modified bead-spring model exhibiting strongly enhanced crystallization resistance, enabling study of glass formation upon exposure to well-ordered walls.

    4. Microcantilevers as gas-phase sensing platforms: Simplification and optimization of the production of polymer coated porous-silicon-over-silicon microcantilevers (pages 141–146)

      Shai Meltzman, Ariel Shemesh, Sara Stolyarova, Yael Nemirovsky and Yoav Eichen

      Article first published online: 4 NOV 2013 | DOI: 10.1002/polb.23405

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      Vapor stain etching is a simple and elegant way to achieve asymmetric roughening of silicon microcantilevers. These can be further coated with sensing layers simply by dipping in polymer solutions. This work investigates the optimal conditions for obtaining the best guest-induced bending performance of the microcantilevers. These simple microcantilever arrays could serve as a sensitive and effective gas-phase sensing tool offering detection ability for a wide range of analytes.

    5. Enhancing the device performance of a blue light-emitting copolymer using CdSe/ZnS quantum dots (pages 147–156)

      Selin Pıravadılı Mucur, Daniel Lenkeit, Ioannis Kanelidis, Sait Eren San, Elisabeth Holder and Emine Tekin

      Article first published online: 6 NOV 2013 | DOI: 10.1002/polb.23406

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      Compared to organic emitters, inorganic semiconductor quantum dots (QDs) have a number of advantages such as their high photostability and narrow emission linewidth. Hybrid inorganic/organic polymer composites containing QDs are applied to polymer light-emitting devices (PLEDs). These hybrid PLEDs consist of CdSe/ZnS QDs and a synthesized blue-emitting copolymer. Device fabrication and characterization reveals that the light-emitting performance of the blue-emitting copolymer is enhanced dramatically, up to 27-fold compared to the corresponding OLED without QDs.

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