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Neutron Scattering Investigations on the Statics and Dynamics of Polydimethyl‐ and Polyethylmethylsiloxane Melts
Author(s) -
Götz Heide,
Ewen Bernd,
Maschke Ulrich,
Meier Gerd,
Monkenbusch Michael
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20011101)202:17<3334::aid-macp3334>3.0.co;2-4
Subject(s) - chain (unit) , neutron scattering , quasielastic neutron scattering , polydimethylsiloxane , statics , relaxation (psychology) , polymer , molecular dynamics , thermodynamics , chemical physics , polymer chemistry , chemistry , scattering , materials science , small angle neutron scattering , polymer science , physics , computational chemistry , nanotechnology , classical mechanics , optics , organic chemistry , psychology , social psychology , astronomy
Elastic and quasielastic small angle neutron scattering experiments on low molecular mass isotopic polydimethylsiloxane (PDMS) and polyethylmethylsiloxane (PEMS) blends were performed in order to study the static and dynamic single and many chain behavior in both systems. Within experimental error no differences could be detected with respect to the fundamental chain properties: conformation and type of relaxation. In particular, the latter follows the predictions of the Rouse model up to Q ‐values of 0.2 Å –1 . However, it was also observed that the relaxation rates are not the same. In both siloxanes single chains relax slightly faster than many chains. The origin of this effect is not known. Despite of these deviations the overall experimental findings favor the hypothesis that the collective or many chain properties of low molecular mass polymer melts can be well modeled by the related single chain behavior.