Abstract
Crosslinked and swollen polymer systems have been found to give rise to a ridge on the plots of spin-spin relaxation times T 2 against temperature; this is explained by an incomplete averaging of the nuclear magnetic dipole-dipole interactions during an isotropic movement of chain segments between network joints. A simple sectional model of a chain with both ends fixed is used to get a theoretical dependence of the T 2 in the range of the ridge on the length and equilibrial rigidity of the chain section. The theoretical results are in good agreement with the experimental as far as it concerns the T 2 dependence on the number of crosslinkages and the absolute value of T 2 in the region of the ridge.
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