Eur. Phys. J. B 2, 79-92 (1998)
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

Abstract

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.