The dielectric relaxation of binary mixtures of propanediamine and propanediol

Amo, Yuko; Oshima, Shozo; Tominaga, Yasunori

doi:10.1016/j.jnoncrysol.2007.01.054

Cited by 7 publications

(2 citation statements)

References 8 publications

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“…By contrast, an increase of β KWW as shown in MMT−MOT (Figure ) and PG−EHA (Figure ) solutions is more unusual. Whereas the narrowing of the relaxation dispersion width in the PG−EHA systems is due to the strong interactions (similar behavior was reported in diol-amine solutions at high temperature), the same reasoning for the narrowing behavior in MMT−MOT will not apply. The composition dependence of T g in o -terphenyl/bis-cresol cyclohexane-dimethylether exhibits a negative effect, indicating an entropy-dominant mixing similar to MMT−MOT.…”

Section: Discussionmentioning

confidence: 63%

Structural Relaxation Dynamics in Binary Glass-Forming Molecular Liquids with Ideal and Complex Mixing Behavior

et al. 2010

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The glass transition and structural relaxation dynamics of various binary glass-forming liquids are investigated with dielectric relaxation measurements across the entire composition range. Three categories of solutions with weak, intermediate, and strong mixing effects, namely methyl-m-toluate in methyl o-toluate, methyl m-toluate in di-n-butyl phthalate, and 1,2-propandiol in 2-hexylamine, are selected to address the mixing behaviors from near-ideal to nonideal cases. The glass transition temperatures, fragility indices, and stretching exponents of the solutions are determined and their composition dependence is the focus of this study. The experimental measurements show that mixing generally generates a negative deviation of fragility m relative to the composition average of the results of two neat components (ideal mixing law). This excess negative fragility proves to be a universal feature of binary systems, and the increase of the nonideal mixing degree results in a more pronounced negative deviation. In contrast, the composition dependence of the stretching exponents is more complex, and a transition from the negative to positive deviation is observed for substantial nonideal character. The study assists understanding the dynamics of multicomponent glass formers.

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Section: Discussionmentioning

confidence: 63%

Structural Relaxation Dynamics in Binary Glass-Forming Molecular Liquids with Ideal and Complex Mixing Behavior

et al. 2010

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“…Alcohols are typical hydrogen bonding liquid and are widely used in industry [1][2][3][4]. In the last 20 years the liquid structure of several monohydric alcohols such as methanol, ethanol, 1-propanol, 2-propanol has been extensively studied by spectroscopic techniques [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Dielectric relaxation of dihydric alcohol–1,4-dioxane mixtures using time domain technique

Shinde¹,

Talware²,

Kumbharkhane³

2011

Lithuanian J. Phys.

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Complex dielectric permittivity measurements of 1,2-propanediol-1,4-dioxane mixtures has been carried out at different concentration and in the frequency range of 10 MHz to 20 GHz using time domain reflectometry (TDR). The least squares fit method has been used to obtain the static dielectric constant, relaxation time, and Bruggeman factor for binary mixtures. The Kirkwood-Frohlich theory is applied to compute the dielectric constant for the mixtures. It adequately reproduces the experimental values of static dielectric constants for the 1,2-propanediol-dioxane mixtures. The excess parameters confirm that the heteromolecular hydrogen bonding interactions between 1,2-propanediol and dioxane molecules vary significantly in the mixture. The Bruggeman model for the nonlinear case has been fitted to the experimental dielectric data for mixtures.

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Fragility and glass transition of 1,2-propanediamine and 1,2-propanediol binary mixtures

Terashima,

Takeda

2024

J Therm Anal Calorim

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The dielectric relaxation of binary mixtures of propanediamine and propanediol

Cited by 7 publications

References 8 publications

Structural Relaxation Dynamics in Binary Glass-Forming Molecular Liquids with Ideal and Complex Mixing Behavior

Structural Relaxation Dynamics in Binary Glass-Forming Molecular Liquids with Ideal and Complex Mixing Behavior

Dielectric relaxation of dihydric alcohol–1,4-dioxane mixtures using time domain technique

Fragility and glass transition of 1,2-propanediamine and 1,2-propanediol binary mixtures

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