Étude thermodynamique du polymère super absorbant X10 vis–à–vis de l’eau vapeur

Abstract

Abstract. The organic polymers super absorbents present values of specific surface lower than 2m 2 /g. The isobars of adsorption of water vapor on studied polymer are of type III at ambient temperature with the hysterisis phenomena. For temperatures lower than ambient, the isobars become deformed because of an effect of chains. This type of polymer is characterized by a multi-layer adsorption which occurs before the full-course one is complete. During reactions of adsorption, the polymer undergoes rearrangement polymeric network which results from a co-operative diffusion of the water molecules and from a spacing of chain followed by an expansion of the polymeric network. Three types of water molecules adsorbed on polymer were identified: strongly dependent water, adsorbed water and the water only trapped between the macromolecular chains.

Characterization of a superabsorbent polymer

“…6), as that was obtained by the method of specific surface measurements of the product, which showed that the polymer is nonporous and present a weak surface (2.1 m 2 / g). 14 The analysis of the composition images obtained by retroimagery made it possible to conclude that our sample is homogeneous.…”