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Dielectric behavior of polyurethane and polyurethane-urea elastomers with pyridine moieties in the main chain

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Abstract

The effects of the hard segments structure (1, 6-hexamethylene diisocyanate with 2,3-dihydroxy-pyridine or 2-amino-3-hydroxy-pyridine as chain extenders) on molecular dynamics and local relaxation of two series of polyurethanes were investigated using broadband dielectric spectroscopy. The dielectric experimental data were measured under identical conditions in the frequency range of 100 Hz to 106 Hz and within the temperature range of −100 to 100 °C and were analyzed in terms of electric modulus formalism. All pyridine based-polyurethanes exhibit three distinct relaxation processes (γ, β and α) in their dielectric loss spectra, while at higher temperatures and low frequencies conductivity has a great contribution to dielectric losses. The activation energies for the relaxations and glass transition temperatures (obtained by differential scanning calorimetry) were analyzed and compared. The presence of urea groups and chemical cross-links slightly increases the glass transition temperature and decreases the dielectric strength of the segmental relaxation as a result of higher cohesive domains which disrupt micro-phase separation.

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Authors and Affiliations

  1. “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda No. 41-A, 700487, Iasi, Romania

    Violeta Otilia Potolinca, Emil Buruiana & Stefan Oprea

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  1. Violeta Otilia Potolinca
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  2. Emil Buruiana
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  3. Stefan Oprea
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Correspondence to Stefan Oprea.

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Potolinca, V.O., Buruiana, E. & Oprea, S. Dielectric behavior of polyurethane and polyurethane-urea elastomers with pyridine moieties in the main chain. J Polym Res 20, 237 (2013). https://doi.org/10.1007/s10965-013-0237-y

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  • DOI: https://doi.org/10.1007/s10965-013-0237-y

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