Investigation of thermodynamic and surface characterisation of 4-[4-(2-ethylhexyloxy)benzoyloxy]benzoic acid thermotropic liquid crystal by inverse gas chromatography

The inverse gas chromatography method was used to obtain thermodynamic and surface properties of the thermotropic liquid crystalline material, 4-[4-(2-ethylhexyloxy)benzoyloxy]benzoic acid (EBBA). The retention diagrams of undecane, dodecane, tridecane, ethyl acetate, n-butyl acetate, iso-butyl acet...

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Bibliographic Details
Published in:Liquid crystals 2014-09, Vol.41 (9), p.1323-1331
Main Authors: Cakar, Fatih, Ocak, Hale, Ozturk, Emine, Mutlu-Yanic, Serap, Kaya, Dila, San, Nevim, Cankurtaran, Ozlem, Bilgin-Eran, Belkis, Karaman, Ferdane
Format: Article
Language:English
Subjects:
Acetates
Adsorption
Chromatography
Entropy
Interaction parameters
Inverse gas chromatography
Liquid crystal polymers
Liquid crystals
Solvents
Surface chemistry
surface properties
thermodynamic interaction parameters
Thermodynamics
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Summary:The inverse gas chromatography method was used to obtain thermodynamic and surface properties of the thermotropic liquid crystalline material, 4-[4-(2-ethylhexyloxy)benzoyloxy]benzoic acid (EBBA). The retention diagrams of undecane, dodecane, tridecane, ethyl acetate, n-butyl acetate, iso-butyl acetate, toluene, ethylbenzene, iso-propylbenzene, n-propylbenzene and chlorobenzene on EBBA were plotted at temperatures between 443.2 and 468.2 K. The specific retention volume, , Flory-Huggins interaction parameter, , equation-of-state interaction parameter, , and effective exchange energy parameter, , were determined. The dispersive component of the surface free energy, , of the studied adsorbent surface was estimated using retention times of different nonpolar organic solvents in the infinite dilution region. The specific free energy of adsorption, the enthalpy of adsorption, , and the entropy of adsorption, , of solvents on liquid crystal were determined. The values of were correlated with the donor and the acceptor numbers of the probes to quantify the acidic and the basic parameters of the liquid crystal surface. The values obtained for and parameters indicated an acidic character for the surface of EBBA.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2014.919672