Permeability through cellulose membranes grafted with vinyl monomers in a homogeneous system. VI. States of water in membranes swollen in solutions
✍ Scribed by Noboru Nishioka; Hideki Yamaguchi; Kouichi Kosai
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 439 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Cellulose grafted with vinyl monomers in a dimethyl sulfoxide-paraformaldehyde solvent system was used as membrane materials. The states of water in the membranes swollen in aqueous solutions of NaCl, raffinose, and poly (ethylene glycol) (PEG) were investigated. The amounts of total water and freezing water for the solution-swollen membranes hardly depended on the kind of solutions and were similar to those for the water-swollen membranes. The free water contents for the solutionswollen membranes were different from those for the water-swollen membranes. Apparent activation energies for diffusive permeation of solutes through the membranes were measured. A poor permeability of PEG through the membranes was consistent with a large activation energy for permeation of PEG through them.