COHERENT QUASI-ELASTIC SCATTERING FROM INTERNAL RELAXATIONS IN POLYMERS

Citation
A. Arbe et al., COHERENT QUASI-ELASTIC SCATTERING FROM INTERNAL RELAXATIONS IN POLYMERS, Physica. B, Condensed matter, 234, 1997, pp. 437-441
Citations number
11
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
09214526
Volume
234
Year of publication
1997
Pages
437 - 441
Database
ISI
SICI code
0921-4526(1997)234:<437:CQSFIR>2.0.ZU;2-B
Abstract
The local dynamics of 1,4 polybutadiene below and above the merging of the alpha- and beta-relaxations have been investigated by means of Ne utron Spin Echo. At temperatures below the merging, the dynamic struct ure factor can be described by considering localized motions on a leng th scale of 1.5 Angstrom for the beta-process with the barrier distrib ution obtained from dielectric spectroscopy. Above the merging of the alpha- and beta-relaxations, the experimental data have been successfu lly described by assuming that both processes are statistically indepe ndent.