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Fusion entropy and melt viscosity in some aliphatic hydrocarbons. Relation between fusion entropy and parameterb of the Batchinski equation

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Abstract

The fusion entropy, viscosity and molar volume are measured for the following hydrocarbons: C18H38, C19H40, C20H42 and C20H40. A relation betweenδS fus and the parameterb of the Batchinski equation is given for these compounds and for others previously studied. By employing the calorimetric and viscometric data found in the literature for ionic melts, a similar relation is found to hold for molten salts.

Résumé

L'entropie de fusion, la viscosité et le volume molaire des hydrocarbures C18H38, C19H40, C20H42 et C20H40 ont été mesurés. Une relation entre l'entropie de fusion,δHfus, et le paramètreb de l'équation de Batchinski est proposée pour ces composés et pour d'autres, précédemment étudiés. En utilisant les données calorimétriques et viscosimétriques trouvées dans la littérature pour les produits ioniques fondus, une relation analogue est proposée pour les sels fondus.

Zusammenfassung

Die Schmelzentropie, die ViskositÄt und das Molvolumen wurden für folgende Kohlenwasserstoffe gemessen: C18H38, C19H40, C20H42, C20H40. Eine Korrelation zwischenδSfus und dem Parameterb der Gleichung von Batchinski wird für diese sowie für andere früher untersuchte Verbindungen vorgeschlagen. Durch Verwendung der kalorimetrischen und viskosimetrischen Literaturangaben für geschmolzene ionische Produkte wurde eine analoge Korrelation für geschmolzene Salze vorgeschlagen.

РЕжУМЕ

ИжМЕРЕНы ЁНтРОпИь пл АВлЕНИь, ВьжкОсть И МОльРНыИ ОБЩЕМ слЕДУ УЩИх УглЕВОДОРОДОВ: C18H38, C19H40 C20H42 И C20H40. Дль ЁтИх сО ЕДИНЕНИИ, А тАкжЕ Дль РАНЕЕ ИжУЧЕ ННых, пРИВЕДЕНО сООтНОшЕН ИЕ МЕжδSпл. Иb пАРАМЕт РОМ УРАВНЕНИь БАЧИНскОг О. ИспОльжУь кАлОРИМЕт РИЧЕскИЕ И ВИскОжИМЕ тРИЧЕскИЕ ДАННыЕ, НАИДЕННыЕ В лИ тЕРАтУРЕ Дль РАсплАВОВ ИОННых сОл ЕИ, БылО УстАНОВлЕНО, Ч тО НАИДЕННОЕ сООтНОшЕН ИЕ спРАВЕДлИВО И Дль НИх.

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Abbreviations

η :

viscosity

Φ :

fluidity

V :

molar volume

b :

covolume, following the Batchinski equation

V intr :

intrinsic volume

V dis :

disorder volume

E :

activation energy for the viscous flux

δHfus :

fusion enthalpy

δSfus :

fusion entropy

r c :

cation radius

r a :

anion radius

N :

Avogadro's number

v + :

cationic potential=(1r c )

v − :

anionic potential=(1/r a )

E′ :

internal energy

P e :

external pressure

P i :

internal pressure=(∂E′/∂V)T

cv :

specific heat at constant volume

c p :

specific heat at constant pressure

u :

ultrasonic velocity

Β S :

isoentropic compressibility

Β Τ :

isothermal compressibility

α :

thermal expansion coefficient

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Authors and Affiliations

  1. Istituto Chimico dell' Universitá, Via S. Agostino, 62032, Camerino, Italy

    G. Berchiesi

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  1. G. Berchiesi
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Thanks are due to the C.N.R. (Rome) for financial aid.

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Berchiesi, G. Fusion entropy and melt viscosity in some aliphatic hydrocarbons. Relation between fusion entropy and parameterb of the Batchinski equation. Journal of Thermal Analysis 10, 247–255 (1976). https://doi.org/10.1007/BF01909686

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  • DOI: https://doi.org/10.1007/BF01909686

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