Theory of NMR spectra of associated oligomeric systems

Characterization of Structure and Self-Diffusion of Elastomers by NMR Method

“…by the NMR method, allowing to dene concentration of the associated molecules, the size of associates and time of life of the associated condition [3]. Therefore in our calculations the contribution of associates was also considered by means of the additional correlation function of small-scale molecular motion.…”

“…On the basis of the general theoretical approach developed earlier [3,7] the dependences of signals of diusion attenuation and coecient of self-diusion of D in crosslinked and linear El with a various M w are investigated.…”

“…It should be noted that when studying diusion processes in linear polymers without knots (in polymers with small length of a chain), it is necessary to consider that macromolecules can unite in long-living associates [3] due to inter-molecular interaction. Similar micro-heterogeneity of polymeric systems also is traced Fig.…”