wizyta

od 2020-09-20

Title: Molecular dynamics of podand studied by broadband dielectric and nuclear magnetic resonance spectroscopies

Source: Macromolecular Chemistry and Physics

Year : 2007

Abstract:

Nuclear magnetic resonance (NMR) and broadband dielectric spectroscopies (BDS) were used toanalyze the molecular dynamics in P10.3H Podand. The temperature studies of NMR line and magnetic spin-lattice relaxation times accompanied by DS investigation enabled us to distinguish three main dynamical processes connected with the motions of the P10.3H Podand chains. In the low-temperature region the magnetic relaxation was associated with fast axial C-3 rotation of methyl groups. Moreover, two other independent processes were observed and interpreted as (i) segmental motion of both oxyethylene and ethylene units, and (ii) the overall motion involved in the melting process.

DOI: 10.1002/macp.200700197   (Pobrane:  2008-01-09)