Dynamic heterogeneity in hydrogen-bonded polymers.
We report on neutron spin echo experiments on hydrogen-bonded polymers and compare the experimentally found dynamical structure factor with theoretical predictions. Surprisingly, we find that in the melt phase the expected scaling of the Rouse dynamics is not satisfied. We propose an explanation based upon the large spatial volume occupied by the connecting groups. When the effects of these bulky groups on the local friction are taken into account, the usual scaling behavior is restored.
Muresan
Adrian S
AS
FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
Dubbeldam
Johan L A
JL
Kautz
Holger
H
Monkenbusch
Michael
M
Sijbesma
Rint P
RP
van der Schoot
Paul
P
de Jeu
Wim H
WH