Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography

This study constitutes a new development of surface thermodynamic methods to determine the London dispersive surface free energy component γsd, the specific free energy of adsorption and the Lewis acid-base properties of polymers by using inverse gas chromatography (IGC) at infinite dilution. The ne...

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Autores principales:	Praveen Kumar Basivi, Visweswara Rao Pasupuleti, Tayssir Hamieh
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	Na-CMC Thermal effect Moolecular models, London dispersive surface free energy component, Lewis acid-base constants. Intrinsic temperature of polymer Chemical engineering TP155-156
Acceso en línea:	https://doaj.org/article/8860392dbe2f46ad883dfbd05e3f371d
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spelling	oai:doaj.org-article:8860392dbe2f46ad883dfbd05e3f371d2021-11-22T04:33:08ZSurface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography2666-821110.1016/j.ceja.2021.100207https://doaj.org/article/8860392dbe2f46ad883dfbd05e3f371d2022-03-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666821121001228https://doaj.org/toc/2666-8211This study constitutes a new development of surface thermodynamic methods to determine the London dispersive surface free energy component γsd, the specific free energy of adsorption and the Lewis acid-base properties of polymers by using inverse gas chromatography (IGC) at infinite dilution. The net retention volumes Vn of n-alkanes and polar solvents adsorbed on a sodium carboxymethyl cellulose (Na-CMC) polymer surface were determined at four temperatures 313.15K, 323.15K, 333.15 and -343.15K by IGC technique The London dispersive surface free energy component of Na-CMC was determined by using Dorris-Gray and Dorris-Gray-Hamieh methods, Van der Waals, Redlich-Kwong, Kiselev, geometric, cylindrical, spherical and Hamieh models. The more accurate value of γsd of Na-CMC was obtained by Hamieh model taking into account the thermal effect on the surface areas of molecules: γsd(T)(mJ/m2)=−0.630T(K)+229.01 showing a maximal temperature TMax = 91°C that can be considered as a new characteristic of the Na-CMC polymer. Above TMax, there is no dispersive component of the surface energy of the polymer surface.The specific interactions of Na-CMC particles were determined by using the various molecular models, and the vapor pressure, the boiling point, the topological index and the deformation polarization IGC methods. The obtained results clearly showed a strong Lewis basicity of Na-CMC (about seven times more basic than acidic polymer surface). It was proved that the IGC methods and models do not give similar results. The thermal model gave the most accurate result of the Lewis acid-base properties of Na-CMC surface.Praveen Kumar BasiviVisweswara Rao PasupuletiTayssir HamiehElsevierarticleNa-CMCThermal effectMoolecular models, London dispersive surface free energy component, Lewis acid-base constants. Intrinsic temperature of polymerChemical engineeringTP155-156ENChemical Engineering Journal Advances, Vol 9, Iss , Pp 100207- (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Na-CMC Thermal effect Moolecular models, London dispersive surface free energy component, Lewis acid-base constants. Intrinsic temperature of polymer Chemical engineering TP155-156
spellingShingle	Na-CMC Thermal effect Moolecular models, London dispersive surface free energy component, Lewis acid-base constants. Intrinsic temperature of polymer Chemical engineering TP155-156 Praveen Kumar Basivi Visweswara Rao Pasupuleti Tayssir Hamieh Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
description	This study constitutes a new development of surface thermodynamic methods to determine the London dispersive surface free energy component γsd, the specific free energy of adsorption and the Lewis acid-base properties of polymers by using inverse gas chromatography (IGC) at infinite dilution. The net retention volumes Vn of n-alkanes and polar solvents adsorbed on a sodium carboxymethyl cellulose (Na-CMC) polymer surface were determined at four temperatures 313.15K, 323.15K, 333.15 and -343.15K by IGC technique The London dispersive surface free energy component of Na-CMC was determined by using Dorris-Gray and Dorris-Gray-Hamieh methods, Van der Waals, Redlich-Kwong, Kiselev, geometric, cylindrical, spherical and Hamieh models. The more accurate value of γsd of Na-CMC was obtained by Hamieh model taking into account the thermal effect on the surface areas of molecules: γsd(T)(mJ/m2)=−0.630T(K)+229.01 showing a maximal temperature TMax = 91°C that can be considered as a new characteristic of the Na-CMC polymer. Above TMax, there is no dispersive component of the surface energy of the polymer surface.The specific interactions of Na-CMC particles were determined by using the various molecular models, and the vapor pressure, the boiling point, the topological index and the deformation polarization IGC methods. The obtained results clearly showed a strong Lewis basicity of Na-CMC (about seven times more basic than acidic polymer surface). It was proved that the IGC methods and models do not give similar results. The thermal model gave the most accurate result of the Lewis acid-base properties of Na-CMC surface.
format	article
author	Praveen Kumar Basivi Visweswara Rao Pasupuleti Tayssir Hamieh
author_facet	Praveen Kumar Basivi Visweswara Rao Pasupuleti Tayssir Hamieh
author_sort	Praveen Kumar Basivi
title	Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
title_short	Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
title_full	Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
title_fullStr	Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
title_full_unstemmed	Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
title_sort	surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/8860392dbe2f46ad883dfbd05e3f371d
work_keys_str_mv	AT praveenkumarbasivi surfacethermodynamicpropertiesofsodiumcarboxymethylcellulosebyinversegaschromatography AT visweswararaopasupuleti surfacethermodynamicpropertiesofsodiumcarboxymethylcellulosebyinversegaschromatography AT tayssirhamieh surfacethermodynamicpropertiesofsodiumcarboxymethylcellulosebyinversegaschromatography
_version_	1718418173323116544

Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography

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