Permeation of water as a tool for characterizing the effect of solvent, film thickness and water solubility in cellulose acetate membranes

Abstract

Cellulose acetate membranes have been used in many applications; of particular interest are reverse osmosis systems, and as a neutral matrix for incorporation of different polymers (e.g., conducting polymers), inorganic ions (e.g., lanthanides) and organic (e.g., pharmaceutical) compounds. The properties of the new polymers derived from cellulose acetate or blends depend on those of cellulose acetate. This work presents an attempt to find links between thermodynamic and kinetic properties of cellulose acetate membranes in equilibrium with water. Water diffusion coefficients in cellulose acetate membranes are reported, measured with a simple water permeation technique. The comparison of these values with the percentage of water uptake and polymer thickness leads to interesting conclusions related with different polymer properties.

Modification of cellulose acetate membrane using monosodium glutamate additives prepared by microwave heating

“…5 for all the TMCA series membranes. These values obtained were in accordance with the cited literatures [34,35], which was approximately 230 8C. It was observed that the melting point for the TMCA series membranes depend solely on CA and not MSG (although MSG was present in the dope solution and has T m of 232 8C).…”

Water barrier properties of treated-papers and application to sponge cake storage

“…The decrease in the diffusion coefficient with the moisture content increase was also observed for a methylcellulose film or a cellulose acetate membrane, the decrease occurring from 3% (in d.b.) and 2% moisture content respectively, what is close to our values Valente, Polishchuk, Burrows, & Lobo, 2005). The shape of the curve could be explained by the mechanism of water migration in porous moist solids (Aguerre & Suarez, 2004).…”

Transport of solutes through calix[4]pyrrole-containing cellulose acetate films

“…2 shows, as example, the infrared spectra of B1 and B4 films. In addition to the characteristic cellulose acetate bands at 1748, 1234 and 1046 cm À1 [25], new bands are observed at 1578 (C@C aromatic ), 2887 (C-H aliphatic ) and 3440 (N-H) cm À1 . These bands are indicative of the CP incorporation to cellulose acetate matrix.…”