Spatial in formation on the stress-strain in a polymer gel

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^1H NMR imaging patterns with information about the spatial distribution of ^1H spin density and ^1H spin-spin relaxation time T_2 of water molecules in a crosslinked polymer gel were successfully measured, in order to clarify the translational behavior of water molecules in the gel under the propagation of stress-strain and shrinkage process by the application of an electric field. From these experimental results it was found that the propagation mechanism of stress-strain and the shrinkage process were elucidated.