The rate memory of a polymer close to T-g as elucidated by reduced 4-D NMRecho experiments

Citation
U. Tracht et al., The rate memory of a polymer close to T-g as elucidated by reduced 4-D NMRecho experiments, APPL MAGN R, 17(2-3), 1999, pp. 227-241
Citations number
31
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
APPLIED MAGNETIC RESONANCE
ISSN journal
09379347 → ACNP
Volume
17
Issue
2-3
Year of publication
1999
Pages
227 - 241
Database
ISI
SICI code
0937-9347(1999)17:2-3<227:TRMOAP>2.0.ZU;2-T
Abstract
We analyze the reorientational dynamics of a polymer close to the glass tra nsition. Via comparison of two-time and four-time correlation functions, ob tained from multidimensional nuclear magnetic resonance C-13 echo experimen ts, we are particularly sensitive to the fluctuations within the heterogene ous distribution of mobilities. From variation of the experimental paramete rs we obtain a detailed picture of the interplay between jump and diffusion dynamics, including the different types of motional heterogeneities and th e geometry of the system.