Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography

Praveen Kumar Basivi and Visweswara Rao Pasupuleti and Tayssir Hamieh (2021) Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography. Chemical Engineering Journal Advances, 9 (100207). pp. 1-10. ISSN 2666-8211

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Abstract

This study constitutes a new development of surface thermodynamic methods to determine the London dispersive surface free energy component γd s, 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 DorrisGray-Hamieh methods, Van der Waals, Redlich-Kwong, Kiselev, geometric, cylindrical, spherical and Hamieh models. The more accurate value of γd s of Na-CMC was obtained by Hamieh model taking into account the thermal effect on the surface areas of molecules: γd s(T)(mJ /m2) = − 0.630 T(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.

Item Type:	Article
Keyword:	Na-CMC , Thermal effect , Moolecular models , London dispersive surface free energy component , Lewis acid-base constants . Intrinsic temperature of polymer
Subjects:	Q Science > QD Chemistry > QD1-999 Chemistry R Medicine > R Medicine (General) > R5-920 Medicine (General)
Department:	FACULTY > Faculty of Medicine and Health Sciences
Depositing User:	SITI AZIZAH BINTI IDRIS -
Date Deposited:	17 Jul 2022 09:57
Last Modified:	17 Jul 2022 09:57
URI:	https://eprints.ums.edu.my/id/eprint/33301

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