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Simple-liquid dynamics emerging in the mechanical shear spectra of poly(propylene glycol)

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Abstract

The present dielectric investigations of methyl-terminated poly(propylene glycol) (PPG) oligomers reveal that near the glass transition the normal modes and segmental relaxation merge in a single-process susceptibility spectrum, similar to previous observations on OH-terminated species. Moreover, the present shear-mechanical measurements demonstrate that the vanishing of chain modes can be monitored without recourse to dielectric investigations, which are able to access chain dynamics only for the relatively small fraction of type A polymers. As the normal and segmental modes merge, the viscosity displays a crossover from a polymer-like regime governed by the chain dynamics, to a simple-liquid regime governed by the structural relaxation.

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Acknowledgements

Support by the Deutsche Forschungsgemeinschaft (Grant BO1301/14-1) is gratefully acknowledged. This work was partially supported by the VILLUM Foundation. The US team thanks the NSF Polymer program for financial support (DMR-1408811).

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Authors and Affiliations

  1. Fakultät Physik, Technische Universität Dortmund, 44221, Dortmund, Germany

    Catalin Gainaru, Burak Cetinkaya & Roland Böhmer

  2. “Glass and Time,” IMFUFA, Department of Sciences, Roskilde University, Postbox 260, 4000, Roskilde, Denmark

    Tina Hecksher, Niels Boye Olsen & Jeppe C. Dyre

  3. Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA

    Fei Fan, Kunyue Xing & Alexei P. Sokolov

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  1. Catalin Gainaru
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  2. Tina Hecksher
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Correspondence to Catalin Gainaru.

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Gainaru, C., Hecksher, T., Fan, F. et al. Simple-liquid dynamics emerging in the mechanical shear spectra of poly(propylene glycol). Colloid Polym Sci 295, 2433–2437 (2017). https://doi.org/10.1007/s00396-017-4206-6

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  • DOI: https://doi.org/10.1007/s00396-017-4206-6

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