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On the theory of deuteron NMR free induction decay of reptating polymer chains: Effect of end segment dynamics

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dc.contributor.author Ostrovskaya I.K.
dc.contributor.author Fatkullin N.F.
dc.contributor.author Körber T.
dc.contributor.author Rössler E.A.
dc.contributor.author Lozovoi A.
dc.contributor.author Mattea C.
dc.contributor.author Stapf S.
dc.date.accessioned 2021-02-24T20:32:43Z
dc.date.available 2021-02-24T20:32:43Z
dc.date.issued 2020
dc.identifier.issn 0021-9606
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/160806
dc.description.abstract © 2020 Author(s). A self-consistent approximation beyond the Redfield limit and without using the Anderson-Weiss approximation for the Free Induction Decay (FID) of deuteron spins belonging to polymer chains undergoing reptation is formulated. The dynamical heterogeneity of the polymer segments created by the end segments is taken into account. Within an accuracy of slow-changing logarithmic factors, FID can be qualitatively described by a transition from an initial pseudo-Gaussian to a stretched-exponential decay at long times. With an increase in observation time, the contribution from end effects to the FID increases. In the regime of incoherent reptation, contributions to the FID from central segments yield an exponent of 1/4 for the stretched decay and contributions from end segments yield an exponent of 3/16. In the regime of coherent reptation, the central segments generate a stretching exponent of 1/2, whereas the end segments contribute with an exponent of 1/4. These predictions are shown to be in qualitative agreement with the experimental FIDs of perdeuterated poly(ethylene oxide) with molecular masses of 132 kg/mol and 862 kg/mol.
dc.relation.ispartofseries Journal of Chemical Physics
dc.title On the theory of deuteron NMR free induction decay of reptating polymer chains: Effect of end segment dynamics
dc.type Article
dc.relation.ispartofseries-issue 18
dc.relation.ispartofseries-volume 152
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS00219606-2020-152-18-SID85084871508

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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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