Determination of glass transitions and PMMA/Al2O3 by thermal and chromatographic methods [Determination des transitions vitreuses et locales de PMMA/Al2O3 par des methodes thermiques et chromatographiques]

Differential thermal analysis (DTA) technique was used to determine the glass transition temperatures of polymethyl methacrylate (PMMA). When PMMA was adsorbed on α-alumina, DTA could not use to obtain the glass transition temperatures of the system PMMA/α-Al2O3. Inverse gas chromatography at infinite dilution proved to be an excellent technique to highlight glass transitions and local transitions of PMMA adsorbed on α-Al2O3, at various covered surface fractions.