Dielectric relaxation and conductivity in propylene carbonate

Huck, J.; Noyel, G.; Jorat, L.; Bondeau, A.

doi:10.1016/0304-3886(82)90087-0

Cited by 16 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Here < τ > denotes the mean relaxation time [48] calculated from < τ > CD = β CD τ CD for the CD function and < τ > KW W = τ KW W /β KW W × Γ(1/β KW W ) (Γ denoting the Gamma function) for the KWW function. The results from the CD (circles) and the KWW fits (pluses) agree perfectly well and are in accord with previously published data [37,[40][41][42]36,49]. ν τ (T ) shows the well known deviations from thermally activated behavior, typical for fragile glass-formers.…”

Section: Resultssupporting

confidence: 90%

“…1. In most respects the data agree well with the results of earlier dielectric investigations of PC [37][38][39][40][41][42]36,43,44] which were restricted to smaller frequency and temperature ranges. However, some differences show up in the absolute values (see below).…”

Section: Figures 1 Andsupporting

confidence: 88%

“…However, the relaxation time at 195 K reported by these authors deviates by more than one decade from that found in the present and other works [42,49] which sheds some doubt upon the significance of the results at this temperature. Also from the results of Huck et al [40] and Angell et al [36] near 170 K a much higher magnitude of ∆ε (> 100) than determined here can be read off. The determination of the absolute values of ∆ε is a difficult task as it depends on the shifting factors necessary to match results from different experimental set-ups and on the subtraction of possible stray capacitances inherent to some methods.…”

Section: Resultssupporting

confidence: 55%

See 2 more Smart Citations

Broadband dielectric spectroscopy on glass-forming propylene carbonate

et al. 1999

View full text Add to dashboard Cite

Dielectric spectroscopy covering more than 18 decades of frequency has been performed on propylene carbonate in its liquid and supercooled-liquid state. Using quasioptic submillimeter and far-infrared spectroscopy, the dielectric response was investigated up to frequencies well into the microscopic regime. We discuss the alpha process whose characteristic time scale is observed over 14 decades of frequency and the excess wing showing up at frequencies some three decades above the peak frequency. Special attention is given to the high-frequency response of the dielectric loss in the crossover regime between alpha peak and boson peak. Similar to our previous results in other glass-forming materials, we find evidence for additional processes in the crossover regime. However, significant differences concerning the spectral form at high frequencies are found. We compare our results to the susceptibilities obtained from light scattering and to the predictions of various models of the glass transition.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Figures 1 Andsupporting

confidence: 88%

Section: Resultssupporting

confidence: 55%

See 1 more Smart Citation

Broadband dielectric spectroscopy on glass-forming propylene carbonate

et al. 1999

View full text Add to dashboard Cite

show abstract

“…Although the widely cited value at ambient pressure m p = 104 (based on dielectric spectroscopy data from Ref. 67) places PC as a very fragile glassformer, later measurements yield slightly smaller values: m p = 99 from calorimetric measurements 2 and m p = 94±3 from dielectric ones 1,13 . The value obtained in this work at ambient pressure practically coincides with the last one (m p = 92 ± 5) but it seems to us that the limited pressure range does not allow the authors of Ref.…”

Section: Discussion and Conclusive Remarksmentioning

confidence: 94%

Dielectric spectroscopy and ultrasonic study of propylene carbonate under ultra-high pressures

Kondrin

Gromnitskaya²,

Pronin³

et al. 2012

The Journal of Chemical Physics

View full text Add to dashboard Cite

We present the high pressure dielectric spectroscopy (up to 4.2 GPa) and ultrasonic study (up to 1.7 GPa) of liquid and glassy propylene carbonate (PC). Both of the methods provide complementary pictures of the glass transition in PC under pressure. No other relaxation processes except α-relaxation have been found in the studied pressure interval. The propylene carbonate liquid is a glassformer where simple relaxation and the absence of β-relaxation are registered in the record-breaking ranges of pressures and densities. The equation of state of liquid PC was extended up to 1 GPa from ultrasonic measurements of bulk modulus and is in good accordance with the previous equations developed from volumetric data. We measured the bulk and shear moduli and Poisson's ratio of glassy PC up to 1.7 GPa. Many relaxation and elastic properties of PC can be qualitatively described by the soft-sphere or Lennard-Jones model. However, for the quantitative description of entire set of the experimental data, these models are insufficient. Moreover, the Poisson coefficient value for glassy PC indicates a significant contribution of non-central forces to the intermolecular potential. The well-known correlation between Poisson's ratio and fragility index (obtained from dielectric relaxation) is confirmed for PC at ambient pressure, but it is violated with pressure increase. This indicates that different features of the potential energy landscape are responsible for the evolution of dielectric response and elasticity with pressure increase.

show abstract

“…Pour la mesure des températures on utilise des sondes à résistance de platine CLARAL (norme DIN 43760) alimentées par un générateur de courant d'intensité constante (1 mA). La dérive de la température n'a jamais excédé 0,3 K au cours des expériences isothermes d'une durée supérieure à 24 h. [20]. On a constaté, dans les limites de l'appareillage (4 x 24), que la valeur de la viscosité est bien indépendante du facteur géométrique K (Fig.…”

unclassified

Mesure par pénétrométrie de viscosités élevées (104-1011 Pl) à basse température (77-300 K)

Bondeau

Huck

1983

Rev. Phys. Appl. (Paris)

View full text Add to dashboard Cite

On a réalisé un pénétromètre à cylindres destiné à la mesure des viscosités de cisaillement des liquides newtoniens comprises entre 104 et 1011 Pl dans l'intervalle de température 77-300 K. L'évolution temporelle de la profondeur d'enfoncement h(t) mesurée par un capteur électromagnétique de déplacement est enregistrée sur mémoire magnétique et traitée par un calculateur de table. Les variations de h2(t) sont linéaires conformément à la théorie. Les valeurs de la viscosité du phényle salicylate mesurées avec ce dispositif sont en bon accord avec celles de Laughlin et Uhlmann obtenues par flexion d'une éprouvette

show abstract

Dielectric relaxation and conductivity in propylene carbonate

Cited by 16 publications

References 8 publications

Broadband dielectric spectroscopy on glass-forming propylene carbonate

Broadband dielectric spectroscopy on glass-forming propylene carbonate

Dielectric spectroscopy and ultrasonic study of propylene carbonate under ultra-high pressures

Mesure par pénétrométrie de viscosités élevées (104-1011 Pl) à basse température (77-300 K)

Contact Info

Product

Resources

About