An equation for the description of volume and temperature dependences of the dynamics of supercooled liquids and polymer melts

Casalini, R.; Roland, C. M.

doi:10.1016/j.jnoncrysol.2007.03.026

Cited by 83 publications

(88 citation statements)

References 23 publications

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“…However, we consider α ′ as mildly adjustable in the range α − 0.5 ≤ α ′ ≤ α + 0.5 to account for small errors in the determination of the glass transition. Taking Y g from the experiment, the total number of adjustable parameters of Eq.19 is two (α ′ and the slope κ), which is less than the number, three, of alternative expression of the TS master curve of the structural relaxation [31,32,34].…”

Section: Comparison With the Experimentsmentioning

confidence: 99%

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Thermodynamic scaling of vibrational dynamics and relaxation

Puosi

Chulkin

Bernini

et al. 2016

The Journal of Chemical Physics

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We investigate by thorough Molecular Dynamics simulations the thermodynamic scaling (TS) of a polymer melt. Two distinct models, with strong and weak virial-energy correlations, are considered. Both evidence the joint TS with the same characteristic exponent γts of the fast mobility -the mean square amplitude of the picosecond rattling motion inside the cage -, and the much slower structural relaxation and chain reorientation. If the cage effect is appreciable, the TS master curves of the fast mobility are nearly linear, grouping in a bundle of approximately concurrent lines for different fragilities. An expression of the TS master curve of the structural relaxation with one adjustable parameter less than the available three-parameters alternatives is derived. The novel expression fits well with the experimental TS master curves of thirty-four glassformers and, in particular, their slope at the glass transition, i.e. the isochoric fragility. For the glassformer OTP the isochoric fragility allows to satisfactorily predict the TS master curve of the fast mobility with no adjustments.

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Section: Comparison With the Experimentsmentioning

confidence: 99%

“…2 s [31,32]. Another expression, with the same number of adjustable parameters, based on an entropic model recently formulated by Mauro et al [33] has been investigated [34].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic scaling of vibrational dynamics and relaxation

Puosi

Chulkin

Bernini

et al. 2016

The Journal of Chemical Physics

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“…Pensado et al [60] proposed the following expression for viscosity: (17) where η 0 , A, γ and ϕ may be used as fit parameters. This expression is based in another equation previously proposed by Casalini and Roland [65] for relaxation time of glass-forming liquids.…”

Section: The Derivative Of E(t)mentioning

confidence: 99%

On the viscosity of two 1-butyl-1-methylpyrrolidinium ionic liquids: Effect of the temperature and pressure

Gaciño

Comuñas

Regueira

et al. 2015

The Journal of Chemical Thermodynamics

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Please cite this article as: F.M. Gaciño, M.J.P. Comuñas, T. Regueira, J.J. Segovia, J. Fernández, On the viscosity of two 1-butyl-1-methylpyrrolidinium ionic liquids: effect of the temperature and pressure, J. Chem. Thermodynamics (2015), doi: http://dx.doi.org/10. 1016/j.jct.2015.03.002 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.On the viscosity of two 1-butyl-1-methylpyrrolidinium ionic liquids: effect of the temperature and pressure

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“…Recently, Casalini and Roland [6,7] discussed how the scaling properties can be derived from the temperature, T, and the volume, V, dependencies of the entropy, and using the Avramov model [8] derived the following expression for the τ(T, V) dependence [6,7,9]:…”

Section: Introductionmentioning

confidence: 99%