Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

String Formation in Sheared Polymer Blends: Coalescence, Breakup and Finite Size Effects

Published

Author(s)

Kalman D. Migler

Abstract

We have discovered a droplet-string transition in concentrated polymer blends which occurs when the size of a dispersed droplet becomes comparable to the gap width between the shearing disks. The transition occurs over a shear rate interval of ~2% and proceeds via the coalescence of O(10E4) droplets in a four stage kinetic process. Once formed, the strings are stable and exhibit pronounced hysteresis. The droplet-string transition is a manifestation of the weakening of the Rayleigh-Tomatika instability due to finite size effects. Possible applications of this new morphology and processing strategy include ultra-thin materials of high one-dimensional strength, polymer blend wires, and novel polymeric scaffolds.
Citation
Physical Review Letters
Volume
No. 86
Issue
No. 6

Keywords

breakup, coalescence, droplet, emulsion, microscopy, polymer blend, shear, strings

Citation

Migler, K. (2001), String Formation in Sheared Polymer Blends: Coalescence, Breakup and Finite Size Effects, Physical Review Letters (Accessed May 30, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created February 1, 2001, Updated February 17, 2017