Issue |
Europhys. Lett.
Volume 53, Number 5, March 2001
|
|
---|---|---|
Page(s) | 598 - 603 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2001-00194-y | |
Published online | 01 December 2003 |
Influence of chain-end relaxation on the primary and secondary relaxation of supercooled polymeric liquids
Polymères, Colloids et Interfaces,
UMR-CNRS, Université du Maine 72085 le Mans Cedex 9, France
Received:
26
June
2000
Accepted:
22
December
2000
We have studied the effect of chain-end relaxation on the
α- and the β-relaxation of
polymer melts by introducing hydrogen bonding end-groups while
keeping the chain backbone the same. Hydrogen bonding of the chain
ends increases the glass transition temperature (), but
the shape of the α-relaxation and its temperature
dependence as a function of
are not influenced. The
β-relaxation is much broader in the presence
of hydrogen bonds between chain
ends, but its temperature is correlated with
. The
results seem to imply that the β-relaxation process is not
necessarily a specific localized motion of a group of atoms as is
often assumed.
PACS: 64.70.Pf – Glass transitions / 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 82.30.Nr – Association, addition, insertion, cluster formation, hydrogen bonding
© EDP Sciences, 2001
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