https://doi.org/10.1007/s100510050228
Apparent slip at a polymer-polymer interface
1
Materials Research Laboratory,
University of California, Santa Barbara CA 93106-5130, USA
2
Department of Chemical Engineering,University of California,
Santa Barbara CA 93106-5130, USA
Corresponding author: a jlgoveas@mrl.ucsb.edu
Received:
18
August
1997
Revised:
1
December
1997
Accepted:
2
December
1997
Published online: 15 March 1998
We consider a planar interface between
strongly-segregated homopolymers subjected to
steady shear in the plane of the interface.
We develop a constitutive equation
for stress relaxation in an inhomogeneous system
for chains obeying Rouse dynamics.
Using this equation, the interfacial
viscosity for a symmetric blend is found to be in agreement with a
scaling prediction due to de Gennes, where ζ is the bead friction
coefficient, b is the segment length,
is the segment
volume and χ is the Flory-Huggins
interaction parameter driving the phase separation.
We generalize our results to asymmetric blends and describe a
phenomenological
extension to entangled melts.
PACS: 83.50.Lh – Interfacial and free surface flows; slip / 83.80.Es – Polymer blends
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998