Accession Number : AD0751605

Title :   The Properties of Water in Polymeric Membranes.

Descriptive Note : Technical rept.,

Corporate Author : HYDRONAUTICS INC LAUREL MD

Personal Author(s) : Frommer,Moshe A. ; Shporer,Mordechai ; Murday,James S. ; Messalem,Rami M.

Report Date : SEP 1972

Pagination or Media Count : 57

Abstract : The relative amounts of freezing and non-freezing water in various water-wet cellulose acetate (CA) membranes have been determined by NMR techniques, from the initial heights of the water component in the free induction decay ('NMR intensity'). Measurements on the first desorption-adsorption cycle of wet CA membranes have also been performed. The solubility and the diffusivity of water and of NaCl in a fully aromatic polyamide (PA) film also have been determined. From these the 'intrinsic permeability characteristics' of this polymer have been calculated and its suitability for desalination by reverse osmosis is compared to that of the commonly used cellulose acetate.

Descriptors :   (*MEMBRANES, *WATER), (*CELLULOSE ACETATES, MEMBRANES), (*POLYAMIDE PLASTICS, MEMBRANES), (*OSMOSIS, MEMBRANES), PERMEABILITY, NUCLEAR MAGNETIC RESONANCE, FREEZING, MOLECULAR ASSOCIATION, DIFFUSION, SOLUBILITY, SODIUM CHLORIDE

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE