Abstract
The behavior of absorbed water in equilibrium-swollen poly(acrylamide-co-sodium acrylate) [P(Am-NaA)] hydrogel is studied with 1H nuclear magnetic resonance (1H-NMR). The observed non-exponential decay of the spin–spin relaxation data manifests at least two distinguishable environmental states of the absorbed water in all samples. The component, characterized by the relatively shorter T2, is associated with the more tightly bound water; whereas the other, characterized by longer T2, might be a combination of near normal and loosely bound water. Attention is directed to the way in which relaxation times and the corresponding fraction of each type of water behave as a function of the crosslink density at 25°C. There is evidence of a sudden change of the crosslink state in P(Am-NaA) hydrogel at crosslink density of about 1.0%. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 1203–1207, 1999
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