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We determined the local strain profile in sheared lamellar block copolymers. A trilayer model, based on elastic brushes separated by viscous interpenetration zones, captures the rheological response of these materials and provides a measure of the relative contributions of elastic versus viscous strain. The elastic chain distortions were evident from a reversible lamellar contraction, as measured from in situ small-angle x-ray scattering. The contraction was directly correlated to the elastic strain from our trilayer model; three distinct diblock copolymers conform to the predicted relationship, thus suggesting universal behavior.
Polis, D. L., Winey, K. I., Ryan, A. J., & Smith, S. D. (1999). Nature of Viscoelasticity in Lamellar Block Copolymers: Contraction Correlated to Strain Localization. Retrieved from https://repository.upenn.edu/mse_papers/88
Date Posted: 11 July 2006
This document has been peer reviewed.