dc.contributor.author |
Gubaidullin A. |
|
dc.contributor.author |
Shakirov T. |
|
dc.contributor.author |
Fatkullin N. |
|
dc.contributor.author |
Kimmich R. |
|
dc.date.accessioned |
2018-09-18T20:10:26Z |
|
dc.date.available |
2018-09-18T20:10:26Z |
|
dc.date.issued |
2009 |
|
dc.identifier.issn |
0926-2040 |
|
dc.identifier.uri |
https://dspace.kpfu.ru/xmlui/handle/net/137252 |
|
dc.description.abstract |
The Mori-Zwanzig projection operator technique was employed to derive the effective Hamiltonian for spin-segment coupling. The fluctuations of this operator are responsible for spin-lattice relaxation in polymer chains. In detail, dipolar interaction of spins is rigorously analyzed by components representing fluctuations of the Kuhn segment end-to-end vectors and local fluctuations on a length scale shorter than the root mean square Kuhn segment length. The former correspond to the usual coarse-grain picture of polymer chain mode theories. It is shown that these non-local chain modes dominate proton spin-lattice relaxation dispersion of flexible polymers at frequencies up to about 108 Hz. A corresponding evaluation of experimental data for polybutadiene melts is presented. © 2008 Elsevier Inc. All rights reserved. |
|
dc.relation.ispartofseries |
Solid State Nuclear Magnetic Resonance |
|
dc.subject |
Chain modes |
|
dc.subject |
Field-cycling NMR relaxometry |
|
dc.subject |
Local motions |
|
dc.subject |
Mori-Zwanzig projector formalism |
|
dc.subject |
Polybutadiene |
|
dc.subject |
Polymer dynamics |
|
dc.subject |
Spin-lattice relaxation |
|
dc.title |
Spin-lattice relaxation dispersion in polymers: Dipolar-interaction components and short- and long-time limits |
|
dc.type |
Article |
|
dc.relation.ispartofseries-issue |
3 |
|
dc.relation.ispartofseries-volume |
35 |
|
dc.collection |
Публикации сотрудников КФУ |
|
dc.relation.startpage |
147 |
|
dc.source.id |
SCOPUS09262040-2009-35-3-SID67349269497 |
|