Abstract
PVA films with a wide span of hydration (swelling) were soaked at different temperatures in iodine aqueous solutions to make the iodine–PVA complex, with a particular concern for the effects of the degree of hydration (D.H.) on the complex formation. The visible absorption maximum λmax increased with D.H., while it decreased with temperature. The equilibrium amount of the complex increased with D.H. at a given concentration of iodine below 20-°C. However, the effects of D. H. on the amount of complex deteriorated with increasing temperature and at 45-°C became reversed to those at low temperature. When the samples soaked at 5-°C were heated in the solution, the amount of complex suddenly began to decrease at 20-°C; this corresponded to the sudden stress relaxation of water swollen PVA films. This transition seems to have great effect on the complexation.
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