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Neutron spin echo investigations in the α and β relaxation regime of polybutadiene
Author(s) -
Richter D.
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971210114
Subject(s) - neutron spin echo , relaxation (psychology) , quasielastic neutron scattering , neutron scattering , neutron , dielectric , nuclear magnetic resonance , polybutadiene , spin echo , materials science , jump , condensed matter physics , momentum transfer , jump process , dynamic structure factor , molecular physics , chemical physics , physics , scattering , inelastic neutron scattering , nuclear physics , polymer , optics , quantum mechanics , magnetic resonance imaging , psychology , social psychology , radiology , medicine , optoelectronics , copolymer
This short review presents quasielastic neutron scattering and dielectric experiments on the α and β slow relaxation in polybutadiene. Exploiting the momentum transfer dependent dynamic structure factor, spatial information about the underlying molecular motions is obtained. While the β slow process reveals itself as a local jump with average jump distances of about 1.5 Å, the α relaxation is diffusive and occurs statistically independently from the β slow process. With this result a consistent interpretation of dielectric spectra on the same polymer is achieved.