Abstract
The state of water in water-swollen poly(vinyl alcohol-co-itaconic acid) membranes, having various water contents from 0.31 to 0.83, was investigated by d.s.c. measurements and compared with those in water-swollen poly(vinyl alcohol) membranes. The amount of freezing water in the membranes was estimated by use of a relationship between the phase transition temperature and the enthalpy of the crystallization of supercooled water. The melting temperature of the water in the membranes immersed in urea and NaCl 0-2 mol l-1 aqueous solutions was also determined by d.s.c. analysis. The present study proposes a method for estimating the solubilities of urea and NaCl in both of the freezing and the non-freezing water using the melting point depression of the freezing water in the membranes immersed in the solute solution.
| Original language | English |
|---|---|
| Pages (from-to) | 1833-1837 |
| Number of pages | 5 |
| Journal | Polymer |
| Volume | 26 |
| Issue number | 12 |
| DOIs | |
| State | Published - Nov 1985 |
Keywords
- differential scanning calorimetry
- membrane
- poly(vinyl alcohol-co-itaconic acid)
- sodium chloride
- solubility
- sorption
- urea
- water