Abstract
It is found that in superabsorbing hydrolyzed starch-g-poly(acrylonitrile), steady-state and transient nuclear Overhauser effect (NOE) and spin-lattice relaxation time measurements bring out the dynamic response to hydration. The NOE factor is seen to be sensitive to the hydration level. At low hydrations the NOE behavior is consistent with the process of preferential hydration in this polymer. The NOE does not reach the theetical maximum even when hydrated to 8.0 g/g. Selective 1 H irradiation experiments with MASS bring out the importance of interchain interactions between the pendent groups and starch units
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