title: Relationship between structural and stress relaxation in a block-copolymer melt.
abstract: The relationship between structural relaxation on molecular length scales and macroscopic stress relaxation was explored in a disordered block-copolymer melt. Experiments show that the structural relaxation time, measured by x-ray photon correlation spectroscopy is larger than the terminal stress relaxation time, measured by rheology, by factors as large as 100. We demonstrate that the structural relaxation data are dominated by the diffusion of intact micelles while the stress relaxation data are dominated by contributions due to disordered concentration fluctuations.
authors.affiliation: Department of Chemical Engineering, University of California, Berkeley, California 94720, USA.
authors.forename: Amish J
authors.initials: AJ
authors.lastname: Patel
authors.forename: Suresh
authors.initials: S
authors.lastname: Narayanan
authors.forename: Alec
authors.initials: A
authors.lastname: Sandy
authors.forename: Simon G J
authors.initials: SG
authors.lastname: Mochrie
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Garetz
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Watanabe
authors.forename: Nitash P
authors.initials: NP
authors.lastname: Balsara