KFU. Card publication. Spin Relaxation and Dynamics of Ring Poly(ethylene oxide) in Melts

KAZAN
FEDERAL UNIVERSITY

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SPIN RELAXATION AND DYNAMICS OF RING POLY(ETHYLENE OXIDE) IN MELTS

Form of presentation

Articles in international journals and collections

Year of publication

2024

Язык

английский

Authors, employees of KFU

Fatkullin Nail Fidaievich, author

Other authors

Stapf Stapf , author

Bibliographic description in the original language

Kevin Lindt, Nail Fatkullin, Carlos Mattea, Jürgen Allgaier, Siegfried Stapf, and Margarita Kruteva, Spin Relaxation and Dynamics of Ring Poly(ethylene oxide) in Melts, Macromolecules,2024, 57, 8, 3765-3775 (Article) Open Access Publication Date (Web):April 9, 2024 DOI: 10.1021/acs.macromol.3c02360

Annotation

The spin relaxation of protons and deuterons was investigated in melts of ring poly(ethylene oxide) (PEO) macromolecules with a molecular mass varying from 5280 to 96,000 Da. Comparison of the frequency dispersion of NMR spin− lattice relaxation rates with corresponding rates in the melts of linear PEO of similar molecular masses shows that there is a significant mutual interpenetration of neighboring ring macromolecules, although less pronounced than in their linear counterparts. The mean-squared displacement of ring segments in the investigated frequency interval corresponding to the time interval 8 × 10−9 to 2 × 10−5 s depends on time as ⟨rn 2(t)⟩ ∝ t0.39, in agreement with neutron spin echo (NSE) results. Decays of the normalized Hahn echo signal in ring macromolecules are exponential within experimental errors, unlike for their linear counterparts where strongly nonexponential behavior is found. This indicates the absence of dynamic heterogeneity of ring segments seen by NMR and associated with the presence of end segments in their linear analogues.

Keywords

NMR, polymer, ring, dynamics

The name of the journal

MACROMOLECULES

URL

https://pubs.acs.org/action/showCitFormats?doi=10.1021/acs.macromol.3c02360&ref=pdf

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=299816&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Fatkullin Nail Fidaievich	ru_RU
dc.contributor.author	Stapf Stapf	ru_RU
dc.date.accessioned	2024-01-01T00:00:00Z	ru_RU
dc.date.available	2024-01-01T00:00:00Z	ru_RU
dc.date.issued	2024	ru_RU
dc.identifier.citation	Kevin Lindt, Nail Fatkullin, Carlos Mattea, Jürgen Allgaier, Siegfried Stapf, and Margarita Kruteva, Spin Relaxation and Dynamics of Ring Poly(ethylene oxide) in Melts, Macromolecules,2024, 57, 8, 3765-3775 (Article) Open Access Publication Date (Web):April 9, 2024 DOI: 10.1021/acs.macromol.3c02360	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=299816&p_lang=2	ru_RU
dc.description.abstract	MACROMOLECULES	ru_RU
dc.description.abstract	The spin relaxation of protons and deuterons was investigated in melts of ring poly(ethylene oxide) (PEO) macromolecules with a molecular mass varying from 5280 to 96,000 Da. Comparison of the frequency dispersion of NMR spin− lattice relaxation rates with corresponding rates in the melts of linear PEO of similar molecular masses shows that there is a significant mutual interpenetration of neighboring ring macromolecules, although less pronounced than in their linear counterparts. The mean-squared displacement of ring segments in the investigated frequency interval corresponding to the time interval 8 × 10−9 to 2 × 10−5 s depends on time as ⟨rn 2(t)⟩ ∝ t0.39, in agreement with neutron spin echo (NSE) results. Decays of the normalized Hahn echo signal in ring macromolecules are exponential within experimental errors, unlike for their linear counterparts where strongly nonexponential behavior is found. This indicates the absence of dynamic heterogeneity of ring segments seen by NMR and associated with the presence of end segments in their linear analogues.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	NMR	ru_RU
dc.subject	polymer	ru_RU
dc.subject	ring	ru_RU
dc.subject	dynamics	ru_RU
dc.title	Spin Relaxation and Dynamics of Ring Poly(ethylene oxide) in Melts	ru_RU
dc.type	Articles in international journals and collections	ru_RU