Thermodynamics of Solutions of Hydrocarbons in Low Molecular Weight Poly(isobutylene) : A Gas Chromatographic Study

The reduced chemical potentials (χ*) of 20 normal and branched alkanes, cyclohexane, and three aromatic hydrocarbons at infinite dilution in poly(isobutylene) (PIB) were measured by gas liquid chromatography at five temperatures between 35 and 65 °C. Reduced partial molar residual enthalpies (κ*) we...

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Autores principales: Castells, Reynaldo César, Romero, Lílian Mónica, Nardillo, Ángel Miguel
Formato: Articulo
Lenguaje:Inglés
Publicado: 1996
Materias:
Química
Ciencias Exactas
Poli(isobutileno)
hidrocarburos
termodinámica
cromatografía gaseosa
soluciones de polímeros
Modelo de Flory
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/139386
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-139386
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Ciencias Exactas
Poli(isobutileno)
hidrocarburos
termodinámica
cromatografía gaseosa
soluciones de polímeros
Modelo de Flory
spellingShingle Química
Ciencias Exactas
Poli(isobutileno)
hidrocarburos
termodinámica
cromatografía gaseosa
soluciones de polímeros
Modelo de Flory
Castells, Reynaldo César
Romero, Lílian Mónica
Nardillo, Ángel Miguel
Thermodynamics of Solutions of Hydrocarbons in Low Molecular Weight Poly(isobutylene) : A Gas Chromatographic Study
topic_facet Química
Ciencias Exactas
Poli(isobutileno)
hidrocarburos
termodinámica
cromatografía gaseosa
soluciones de polímeros
Modelo de Flory
description The reduced chemical potentials (χ*) of 20 normal and branched alkanes, cyclohexane, and three aromatic hydrocarbons at infinite dilution in poly(isobutylene) (PIB) were measured by gas liquid chromatography at five temperatures between 35 and 65 °C. Reduced partial molar residual enthalpies (κ*) were calculated from the temperature dependence of χ*; they are positive for PIB + alkane systems but smaller than those obtained in former chromatographic studies. Although uncertainties on κ* are at least 1 order of magnitude larger than those on χ*, binary X12 Flory parameters obtained from κ* display a good correlation with the structural parameter θe1, defined as the ratio of the number of hydrogen atoms on methyl groups to the total number of hydrogen atoms in the alkane molecule. Very poor or nil correlation exists between X12 values obtained from χ* and θe1. The evidence is by no means conclusive, but in principle the χ* results obtained for PIB + alkane systems could be explained in terms of free volume contributions and the antipathy between methyl groups on the alkane molecules and the polymer side groups. Positive partial molar residual entropies were detected for the three aromatic hydrocarbons; their partial molar residual enthalpies are however highly positive, resulting in their poor solvent properties toward PIB.
format Articulo
Articulo
author Castells, Reynaldo César
Romero, Lílian Mónica
Nardillo, Ángel Miguel
author_facet Castells, Reynaldo César
Romero, Lílian Mónica
Nardillo, Ángel Miguel
author_sort Castells, Reynaldo César
title Thermodynamics of Solutions of Hydrocarbons in Low Molecular Weight Poly(isobutylene) : A Gas Chromatographic Study
title_short Thermodynamics of Solutions of Hydrocarbons in Low Molecular Weight Poly(isobutylene) : A Gas Chromatographic Study
title_full Thermodynamics of Solutions of Hydrocarbons in Low Molecular Weight Poly(isobutylene) : A Gas Chromatographic Study
title_fullStr Thermodynamics of Solutions of Hydrocarbons in Low Molecular Weight Poly(isobutylene) : A Gas Chromatographic Study
title_full_unstemmed Thermodynamics of Solutions of Hydrocarbons in Low Molecular Weight Poly(isobutylene) : A Gas Chromatographic Study
title_sort thermodynamics of solutions of hydrocarbons in low molecular weight poly(isobutylene) : a gas chromatographic study
publishDate 1996
url http://sedici.unlp.edu.ar/handle/10915/139386
work_keys_str_mv AT castellsreynaldocesar thermodynamicsofsolutionsofhydrocarbonsinlowmolecularweightpolyisobutyleneagaschromatographicstudy
AT romerolilianmonica thermodynamicsofsolutionsofhydrocarbonsinlowmolecularweightpolyisobutyleneagaschromatographicstudy
AT nardilloangelmiguel thermodynamicsofsolutionsofhydrocarbonsinlowmolecularweightpolyisobutyleneagaschromatographicstudy
bdutipo_str Repositorios
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