J. Phys. IV France 113 (2004) 25
DOI: 10.1051/jp4:20040006

Study of the transition phenomena of poly( - n-propyl) methacrylates adsorbed on silica by Inverse Gas Chromatography (IGC)

T. Hamieh^{1, 2} and J.-M. Saiter<sup>3

1</sup>  Laboratoire de Chimie Analytique, Matériaux, Surfaces et Interfaces (CHAMSI), Faculté des Sciences, Section 1, Université Libanaise, Hadeth, Beyrouth, Liban
²  Institut de Chimie des Surfaces et Interfaces (ICSI-CNRS), UPR 9096, 15 rue Jean Starcky, BP. 2488, 68057 Mulhouse Cedex, France
³  Laboratoire d'Études et de Caractérisation des Amorphes et des Polymères (LECAP), Faculté des Sciences, Université de Rouen, 76821 Mont-Saint-Aignan Cedex, France

Abstract
Inverse gas chromatography at infinite dilution was used in this paper to characterise the superficial and interfacial properties of solid substrates as oxides, polymers or polymers adsorbed on oxides. Especially, we studied the transition phenomena in PMMA and poly( -n-alkyl) methacrylate adsorbed on silica or in their bulk phases. In the case of PMMA (adsorbed on silica or not), the study of the evolution of RTlnVn as a function of 1/T for different n-alkanes, proved that IGC technique allowed to determine with a good accuracy the various transition temperatures: the transition temperature relative to -relaxation, T_g, the glass transition temperature and T_l,l the liquid-liquid transition temperature or order-disorder transition. The same study was also realised with poly( -n-propyl) methacrylate. The glass transition temperatures of this polymer (C3) adsorbed in its bulk phase or on silica were determined. We also showed an important effect of the adsorption of polymer on oxide on the shift in the value of  T_g.

© EDP Sciences 2004