J. Phys. IV France 11 (2001) Pr10-47-Pr10-55
Étude par chromatographie gazeuse inverse (CGI) des propriétés acido-basiques des matériaux textiles en verreT. Hamieh1, 2, M. Gouider1, M. Nardin1, J.-M. Senecot1, J. Schultz1, P. Christou3 and P. Henrat3
1 Institut de Chimie des Surfaces et Interfaces, ICSI-CNRS, UPR 9069, 15 rue Jean Starcky, BP. 2488, 68057 Mulhouse cedex, France
2 Département de Chimie, Faculté des Sciences, Section 1, Université Libanaise, Hadeth, Mont-Liban, Beyrouth, Liban
3 HEXCEL Fabrics, ZI Les Nappes, 38630 Les Avenières, France
Some of our studies were devoted to characterise acid-base properties of some solid substrates like oxides : MgO, ZnO, SiO2 and Al2O3, carbon fibres and polymers as PMMA at various tacticities adsorbed on silica and on alumina by using inverse gas chromatography(IGC) at infinite dilution, systems, that are known to interact strongly through acid-base interactions and ionic bonds. In this paper, we used IGC technique to characterise three textile materials (in glass fibres), noted respectively A, B and C. To do this, we used our model previously elaborated and giving the specific enthalpy of adsorption (-ΔHSP) of a polar molecule adsorbed on a solid :
(-ΔHSP) = KA.DN + KD.AN -K.AN.DN, were DN and AN are the electron donor and acceptor numbers of the molecule and KA.and KD are the acidic and basic constants of the solid. The parameter K reflects the amphoteric character of the solid. Values of KA, KD and K were obtained from this model by using Mathematica program, and allowed to give the following conclusions :
- Material A has an acidic character and it is more acidic than the two other materials.
- Material B has an amphoteric character with a basic tendency.
- Fibre C is the more basic material relatively to the others, the ratio between its basic constant to acidic constant being close to 3.
© EDP Sciences 2001