Issue |
Europhys. Lett.
Volume 39, Number 2, July II 1997
|
|
---|---|---|
Page(s) | 165 - 170 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1997-00330-9 | |
Published online | 01 September 2002 |
Longest relaxation time of linear polybutadiene chains trapped in rubber networks
1
Department of Solid State Physics, Risoe National
Laboratory, P.O. Box 49, DK-4000 Roskilde, Denmark
2
Department of Chemistry of the University of Copenhagen, Symbion,
Fruebjergvej 3, DK-2100 Copenhagen, Denmark
Received:
9
December
1996
Accepted:
6
June
1997
We have used dynamic-mechanical measurements to probe the long-time
dynamics of linear, almost monodisperse polybutadiene chains in two
media: a) their own melts and b) as trapped in our recently
prepared elastomeric networks. The results are compared with the
classical reptation-in-a-tube model of de Gennes and Doi and
Edwards. Within experimental accuracy, the obtained experimental
scaling of the longest relaxation time relative to the
chain mass M (up to
) is the same in both
media:
with
as against x=3
predicted by the "pure” reptation-in-a-tube model. However, the
network data are well described in the range of molar masses
, after correcting the
reptation model for chain-end effects (in the form of contour length
fluctuations). The
for the chains trapped in a network
were found to be 1.9–3.2 times longer than the
of the
respective melts. We present data on ten polybutadienes confined in
two kinds of networks and covering the range of weight average molar
masses
–
.
PACS: 61.41.+e – Polymers, elastomers, and plastics / 83.50.Fc – Linear viscoelasticity / 83.10.Nn – Polymer dynamics
© EDP Sciences, 1997
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