Proton magnetic relaxation in a monomer-oligomer mixture based on unsaturated esters

Autor:	V.A. Shevelev, S. V. Lukasov, Boris Zaitsev, Ye.R. Gasilova
Rok vydání:	1990
Předmět:	Range (particle radiation) education.field_of_study Proton Population General Engineering Analytical chemistry Spin–lattice relaxation Methacrylate Oligomer Spin–spin relaxation chemistry.chemical_compound Monomer chemistry education
Zdroj:	Polymer Science U.S.S.R.. 32:2270-2275
ISSN:	0032-3950
DOI:	10.1016/0032-3950(90)90266-9
Popis:	The spin-lattice and spin-spin proton magnetic relaxation of monomer-oligomer mixtures of unsaturated aromatic esters having methacrylate and/or vinyl end groups are studied as a function of temperature. It is shown that there are two proton sub-systems differing in energy, the population of the least mobile of these being decreased with the temperature. It is shown that there is a relation between the rate of attenuation of the transverse magnetization and the time interval between the pulses in the multi-pulse Karr-Parcel sequence, which indicates exchange between the sub-systems. The previously made assumption that associates exists, based on a study of the structure of the mixture by scattering of polarized light was thus confirmed. The life time of the associates was evaluated as ≈15 ms over the 100–130°C range.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::803aadac574a4d265a8230eb0a4514ec https://doi.org/10.1016/0032-3950(90)90266-9 Zobrazit plný text záznamu