American Journal of Analytical Chemistry, 2020, 11, 129-136 https://www.scirp.org/journal/ajac ISSN Online: 2156-8278 ISSN Print: 2156-8251 DOI: 10.4236/ajac.2020.113010 Mar. 3, 2020 129 American Journal of Analytical Chemistry Study of the Dispersive Component of the Surface Energy of Polylactides by Inverse Gas Chromatography at Infinite Dilution Carla Zarazir 1,2 , Mohamad Rajab 1,2 , Houssam Obeid 1,2 , Joumana Toufaily 1,2 , Imad Toufeili 3 , Tayssir Hamieh 1,2* 1 Laboratory of Materials, Catalysis, Environment and Analytical Methods Laboratory (MCEMA), Lebanese University, Hadath, Lebanon 2 Laboratory of Applied Studies to the Sustainable Development and Renewable Energies (LEADDER), EDST, Lebanese University, Hadath, Lebanon 3 Department of Nutrition and Food Sciences, American University of Beirut (AUB), Beirut, Lebanon Abstract Inverse gas chromatography at infinite dilution is a powerful technique that can be advantageously used to characterize the surface physicochemical properties of solid substrates as oxides and polymers in both forms of powder or fibres. In the case of polymer, this technique can be used to determine the second order transition phenomena temperatures. This paper was devoted to the determination of the glass transition temperature of polylactide polymer. The dispersive component of the surface energy d S γ of polylactides was de- termined by inverse gas chromatography at infinite dilution. Various theo- retical models were used to deduce the dispersive component of the surface energy of the solid substrates. These models are based on the calculation of the molecular areas of adsorbed molecules on the polymer surface: geome- trical model, cylindrical molecular model, liquid density model, BET method, Kiselev results and the two-dimensional Van der Waals and Redlich-Kwong equations. The curves relative to the variation of d S γ as a function of the temperature showed a specific graph with a maximum value of d S γ at a cer- tain particular temperature characteristic to the investigated polylactide po- lymer. In fact, the maxima of d S γ indicated the presence of glass transition temperature Tg of polylactide whatever the molecular model used. This study showed a glass transition temperature equal to 64˚C confirming that obtained by other studies. Keywords Adsorption, Surface Area, Surface Energy, Retention Volume, N-Alkanes, How to cite this paper: Zarazir, C., Rajab, M., Obeid, H., Toufaily, J., Toufeili, I. and Hamieh, T. (2020) Study of the Dispersive Component of the Surface Energy of Poly- lactides by Inverse Gas Chromatography at Infinite Dilution. American Journal of Analytical Chemistry, 11, 129-136. https://doi.org/10.4236/ajac.2020.113010 Received: January 27, 2020 Accepted: February 28, 2020 Published: March 3, 2020 Copyright © 2020 by author(s) and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access