Study of the shape of decay of NMR free induction in polyurethanes

The dependence of the shape of decay of free induction in linear and crosslinked polyurethanes on their composition and structure, and on the temperature of the samples, is revealed. A method is proposed for the analysis of decay of free induction, yielding quantitative information, for cases where...

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Bibliographic Details
Published in:Polymer science USSR 1982, Vol.24 (8), p.1967-1973
Main Authors: Nazarova, I.I., Nazarov, V.B., Baturin, S.M.
Format: Article
Language:English
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Summary:The dependence of the shape of decay of free induction in linear and crosslinked polyurethanes on their composition and structure, and on the temperature of the samples, is revealed. A method is proposed for the analysis of decay of free induction, yielding quantitative information, for cases where we have nonexponential one- or two-component decay with spin-spin relaxation times T 2 differing by less than twofold for each component. T 2 values has been calculated, as well as the correlation times and activation energies of molecular motion. The activation energy largely depends on the oligomeric portion of the chains.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(82)90155-1