Pressure-temperature study of dielectric relaxation of a polyurethane elastomer

Z. Y. Cheng, S. Gross, J. Su, Qiming Zhang

    Research output: Contribution to journalArticle

    19 Citations (Scopus)

    Abstract

    The effect of hydrostatic pressure up to 1,361 atms on the dielectric properties of a segmented polyurethane elastomer (Dow 2103-80AE) is studied at temperatures from 0 °C to 80 °C. The experimental results show that the relaxation time for both the I-process, associated with the molecular motions in the hard segments, and the α-process, associated with the glass transition, increases with pressure, and this shift is more pronounced for the I-process. Besides the glass transition, it is found that the I-process can be described by the Vogel-Fulcher (V-F) and Williams-Landel-Ferry (WLF) relations. At atmospheric pressure, Tg and T0 for the I-process are 235.9 K and 4.2×103 K, respectively. Based on the V-F and WLF relations and experimental results, it is found that a parameter, C1, in the WLF relation is independent of the pressure. Thus, a method is introduced to determine the values of both the characteristic transition temperature (Tg) and activation energy (T0) for the processes at different pressures. As the pressure increases from atmospheric to 1,361 atms, the increase of Tg for the I-process is about 30 °C. The results also show that, for both the I- and the α-processes, T0 decreases with increasing pressure.

    Original languageEnglish (US)
    Pages (from-to)983-990
    Number of pages8
    JournalJournal of Polymer Science, Part B: Polymer Physics
    Volume37
    Issue number10
    DOIs
    StatePublished - May 15 1999

    Fingerprint

    Elastomers
    Polyurethanes
    Dielectric relaxation
    elastomers
    Glass transition
    Temperature
    temperature
    glass
    Hydrostatic pressure
    hydrostatic pressure
    Dielectric properties
    Relaxation time
    Superconducting transition temperature
    Atmospheric pressure
    dielectric properties
    atmospheric pressure
    Activation energy
    relaxation time
    transition temperature
    activation energy

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Polymers and Plastics
    • Materials Chemistry

    Cite this

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    abstract = "The effect of hydrostatic pressure up to 1,361 atms on the dielectric properties of a segmented polyurethane elastomer (Dow 2103-80AE) is studied at temperatures from 0 °C to 80 °C. The experimental results show that the relaxation time for both the I-process, associated with the molecular motions in the hard segments, and the α-process, associated with the glass transition, increases with pressure, and this shift is more pronounced for the I-process. Besides the glass transition, it is found that the I-process can be described by the Vogel-Fulcher (V-F) and Williams-Landel-Ferry (WLF) relations. At atmospheric pressure, Tg and T0 for the I-process are 235.9 K and 4.2×103 K, respectively. Based on the V-F and WLF relations and experimental results, it is found that a parameter, C1, in the WLF relation is independent of the pressure. Thus, a method is introduced to determine the values of both the characteristic transition temperature (Tg) and activation energy (T0) for the processes at different pressures. As the pressure increases from atmospheric to 1,361 atms, the increase of Tg for the I-process is about 30 °C. The results also show that, for both the I- and the α-processes, T0 decreases with increasing pressure.",
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    Pressure-temperature study of dielectric relaxation of a polyurethane elastomer. / Cheng, Z. Y.; Gross, S.; Su, J.; Zhang, Qiming.

    In: Journal of Polymer Science, Part B: Polymer Physics, Vol. 37, No. 10, 15.05.1999, p. 983-990.

    Research output: Contribution to journalArticle

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    AB - The effect of hydrostatic pressure up to 1,361 atms on the dielectric properties of a segmented polyurethane elastomer (Dow 2103-80AE) is studied at temperatures from 0 °C to 80 °C. The experimental results show that the relaxation time for both the I-process, associated with the molecular motions in the hard segments, and the α-process, associated with the glass transition, increases with pressure, and this shift is more pronounced for the I-process. Besides the glass transition, it is found that the I-process can be described by the Vogel-Fulcher (V-F) and Williams-Landel-Ferry (WLF) relations. At atmospheric pressure, Tg and T0 for the I-process are 235.9 K and 4.2×103 K, respectively. Based on the V-F and WLF relations and experimental results, it is found that a parameter, C1, in the WLF relation is independent of the pressure. Thus, a method is introduced to determine the values of both the characteristic transition temperature (Tg) and activation energy (T0) for the processes at different pressures. As the pressure increases from atmospheric to 1,361 atms, the increase of Tg for the I-process is about 30 °C. The results also show that, for both the I- and the α-processes, T0 decreases with increasing pressure.

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