6533b852fe1ef96bd12aabda

RESEARCH PRODUCT

The adsorption of water vapor on super absorbent product at low temperatures and low mass.

M. BakassJ. P. BellatGary L. BertrandA. Mokhlisse

subject

gelPolymers and PlasticsDiffusionpolymervaporwater02 engineering and technology010402 general chemistry01 natural sciencesCondensed Matter::Materials ScienceAdsorptionPolymer chemistryMaterials ChemistryBound waterPhysics::Chemical PhysicsWater contentPhysics::Atmospheric and Oceanic PhysicsComputingMilieux_MISCELLANEOUSchemistry.chemical_classificationQuantitative Biology::BiomoleculesChemistryisothermtechnology industry and agriculturesuper absorbentGeneral ChemistryPolymer[CHIM.MATE]Chemical Sciences/Material chemistry021001 nanoscience & nanotechnologyPolyelectrolyte0104 chemical sciencesSurfaces Coatings and FilmsCondensed Matter::Soft Condensed MatterHysteresis[ PHYS.PHYS.PHYS-CHEM-PH ] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]Chemical engineeringadsorption[ CHIM.MATE ] Chemical Sciences/Material chemistry[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]isobarheat0210 nano-technologyWater vapor

description

The adsorption isotherms of water vapor on super absorbent product have the same form of type III isotherm at ambient temperature with the hysteresis phenomena. For temperatures lower than ambient, the isotherms become deformed because of the chains effect. The polymer is characterized by a multilayer adsorption, which occurs before a full-course is complete. During adsorption reactions, the polymer undergoes rearrangement polymeric network, which results from a cooperative diffusion of the water molecules and from a chain spacing 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. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1450–1456, 2006

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