| Форма представления | Статьи в зарубежных журналах и сборниках |
| Год публикации | 2024 |
| Язык | английский |
|
Фаткуллин Наиль Фидаиевич, автор
|
|
Stapf Stapf , автор
|
| Библиографическое описание на языке оригинала |
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 |
| Аннотация |
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.
|
| Ключевые слова |
NMR, polymer, ring, dynamics |
| Название журнала |
MACROMOLECULES
|
| URL |
https://pubs.acs.org/action/showCitFormats?doi=10.1021/acs.macromol.3c02360&ref=pdf |
| Пожалуйста, используйте этот идентификатор, чтобы цитировать или ссылаться на эту карточку |
https://repository.kpfu.ru/?p_id=299816 |
Полная запись метаданных  |
| Поле DC |
Значение |
Язык |
| dc.contributor.author |
Фаткуллин Наиль Фидаиевич |
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/?p_id=299816 |
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 |
Статьи в зарубежных журналах и сборниках |
ru_RU |
|
EN 
中文 
ES 
Карта сайта
