Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 52 Issue 18

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. 2012 ISI Impact Factor: 2.221

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  1. High strain-rate response of spiropyran mechanophores in PMMA

    James R. Hemmer, Patrick D. Smith, Matt van Horn, Sufian Alnemrat, Brian P. Mason, Javier Read de Alaniz, Sebastian Osswald and Joseph P. Hooper

    Article first published online: 18 AUG 2014 | DOI: 10.1002/polb.23569

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    The high strain-rate response of a spiropyran (SP) mechanophore in PMMA is investigated. This system has shown promise for visualizing stress via a reversible, force-induced bond breaking. While microscale fluorescent imaging shows significant activation of the mechanophore after fast compression, comparison with a related thermochromic SP suggests that thermal effects overwhelm the mechanochemical response. This thermal response is, however, useful in its own right as mean of visualizing heat dissipation during dynamic fracture of glassy polymers.

  2. Extraordinarily large swelling energy of iodine-treated poly(vinyl alcohol) demonstrated by jump of a film

    Tatsuro Takamura, Kazuya Nozawa, Yoshiki Sugimoto and Masatoshi Shioya

    Article first published online: 18 AUG 2014 | DOI: 10.1002/polb.23570

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    A newly developed, iodine-treated poly(vinyl alcohol) shows extraordinarily large vaporinduced deswelling stress reaching 59 MPa, which is one to two orders of magnitude greater than those of ordinary polymer gels. This material has extremely large volumetric and gravimetric energy densities, the elastic modulus of a few GPa, and is heat-resistant to at least 200 °C. The high performance of this material can be demonstrated by a jump of a film.

  3. Effect of steam on structure and mechanical properties of biomedical block copolymers

    Silvia Todros, Chiara Venturato, Arturo N. Natali, Giuseppe Pace and Vito Di Noto

    Article first published online: 16 AUG 2014 | DOI: 10.1002/polb.23567

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    The microdomain morphology of copolymers used in biomedical devices is affected by steam during the sterilization process commonly performed for clinical applications. Steam changes the crystalline conformation of copolymers with a pre-existing hydrogen bonding network, due to the interaction of water with hydrophilic molecular groups, while it does not significantly affect copolymers with weaker interchain interactions. These microdomain conformational variations induce relevant modifications in the mechanical properties, durability, and biocompatibility.

  4. Self-Entanglement of a single polymer chain confined in a cubic box

    Arturo Valery Uzcategui and Sachin Shanbhag

    Article first published online: 11 AUG 2014 | DOI: 10.1002/polb.23562

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    When a long polymer chain (green) is confined to a cube, it gets tangled up, very much like a pair of earphones stuffed in someone's pocket. The primitive path of such a chain (red) identifies the shortest trajectory between the ends of the polymer that does not violate the topology of the entangled chain. In this paper, the entanglement properties of such confined chains are investigated.

  5. Molecular weight dependency of crystallization and melting behavior of β-nucleated isotactic polypropylene

    Ying Lu, Qiao Wang and Yongfeng Men

    Article first published online: 11 AUG 2014 | DOI: 10.1002/polb.23568

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    The formation of β phase in β-nucleated isotactic polypropylene (iPP) at different crystallization temperatures depends heavily on molecular weight. The iPP of lower molecular weight shows dominant α phase regardless of the presence of β nucleating agent, whereas iPP with higher molecular weight prefers forming rich β phase within a wide range of crystallization temperatures, owing to the sluggish movements of long chains hindering the growth of α crystallites.