Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 52 Issue 20

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. Enthalpy of fusion of poly(3-hexylthiophene) by differential scanning calorimetry

    Roddel Remy, Emily Daniels Weiss, Ngoc A. Nguyen, Sujun Wei, Luis M. Campos, Tomasz Kowalewski and Michael E. Mackay

    Article first published online: 12 SEP 2014 | DOI: 10.1002/polb.23584

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    Knowledge of the enthalpy of fusion for poly(3-hexylthiophene) is important to determine its crystallinity after it is deposited or processed. Differential scanning calorimetry (DSC) of low molecular weight samples is demonstrated to be an effective technique to obtain it. Grazing incidence small angle scattering was employed to find a correction factor for the samples' amorphous content near the crystal edge and applied to the DSC data to improve the accuracy of the result, 42.9 ± 2.0 J/g.

  2. Analysis of gas sorption in glassy polymers with the GAB model: An alternative to the dual mode sorption model

    Ondřej Vopička and Karel Friess

    Article first published online: 11 SEP 2014 | DOI: 10.1002/polb.23588

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    Adsorption isotherms of carbon dioxide in cellulose acetate, polyethylene terephtalate, and the first polymer of intrinsic microporosity are analyzed by using the Guggenheim–Anderson–De Boer (GAB) model of multilayer adsorption. The GAB model provides a comparable quality of fit as the classical Dual Mode Sorption model. The analysis of the isosteric heat of adsorption supports the purely adsorptive mechanism, thus providing a new insight into the adsorption of gases in polymers.

  3. Free poly(l-lactic acid) spherulites grown from thermally induced phase separation and the crystallization kinetics

    Ruilai Liu, Kaina Li, Min Liu, Yingying Liu and Haiqing Liu

    Article first published online: 11 SEP 2014 | DOI: 10.1002/polb.23587

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    Free poly(l-lactic acid) sheaves and spherulites were prepared by thermally induced phase separation from a tetrahydrofuran solution without the assistance of other additives. Sheaf and spherulite morphologies were readily tuned by adjusting the processing parameters including solution concentration, quenching temperature, and time. The formation of sheaf and spherulite resulted from nucleation and crystal growth. The PLLA spherulites were composed of fluffy nanofibers with a high porosity (≥90%).

  4. Glass transition temperature of thin polycarbonate films measured by flash differential scanning calorimetry

    Nabila Shamim, Yung P. Koh, Sindee L. Simon and Gregory B. McKenna

    Article first published online: 11 SEP 2014 | DOI: 10.1002/polb.23583

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    Flash differential scanning calorimetry (DSC) can be used to make direct calorimetric measurements on ultrathin films, which generally have been difficult to measure because of the small mass of the films. In this work, Flash DSC is used to determine the glass transition temperature (Tg) of ultrathin polycarbonate films, showing that Tg is depressed as film thickness decreases and that the magnitude of the depression is lower at higher cooling rates.

  5. Distribution of magnetic nanoparticles in spherical polyelectrolyte brushes as observed by small-angle X-ray scattering

    Weihua Wang, Li Li, Xuanji Yu, Haoya Han and Xuhong Guo

    Article first published online: 8 SEP 2014 | DOI: 10.1002/polb.23580

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    The characterization of spherical polyelectrolyte brushes (SPBs) containing magnetic nanoparticles (MNPs) is challenging, especially in real-time, because while DLS can determine the hydrodynamic size of SPBs, it fails to detect the generation of MNPs. Ultrafine MNPs were prepared using SPBs as nanoreactors. Small-angle X-ray scattering (SAXS) was demonstrated to be a powerful method to observe the generation and distribution of MNP in SPB as well as the changes upon changing pH and salt concentration in real-time.

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