| Issue |
Europhys. Lett.
Volume 42, Number 4, May II 1998
|
|
|---|---|---|
| Page(s) | 401 - 406 | |
| Section | Atomic, molecular and optical physics | |
| DOI | https://doi.org/10.1209/epl/i1998-00262-4 | |
| Published online | 01 September 2002 | |
Lamellar block copolymers: Diffusion and reduction of entanglement effects
1
Max Planck Institut für Polymerforschung - Postfach 3148,
55021 Mainz, Germany
2
Corporate Research Science Laboratories,
Exxon Research and Engineering Company, Annandale, New Jersey 08801, USA
Received:
10
December
1997
Accepted:
20
March
1998
Motion of symmetric diblock copolymer chains in the macroscopically oriented
lamellar phase is studied by molecular-dynamics
simulation.
For diblocks of
length N=40 (
and 
,
where Ne is the entanglement length of the
homopolymer melt, the diffusion constant
parallel to the interface 
is
nearly independent of χ,
while the perpendicular component 
is strongly suppressed
as χ, the Flory-Huggins parameter,
is increased in agreement with theoretical predictions based
on the Rouse model.
For even longer chains (N up to 400) a strong reduction of entanglement
effects is observed. We argue
that due to the reduced chain overlap in the lamellar phase
in this intermediate regime
the chain motion is similar to an ellipsoidal molecule in a smectic
phase.
PACS: 36.20.-r – Macromolecules and polymer molecules / 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 83.80.Es – Polymer blends
© EDP Sciences, 1998
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