Rheologica Acta

, Volume 39, Issue 5, pp 444–451

Equibiaxial extensional flow of polymer melts via lubricated squeezing flow. I. Experimental analysis

  • M. Kompani
  • David C. Venerus
ORIGINAL CONTRIBUTION

DOI: 10.1007/s003970000106

Cite this article as:
Kompani, M. & Venerus, D. Rheol. Acta (2000) 39: 444. doi:10.1007/s003970000106

Abstract

The technique of lubricated squeezing flow is evaluated using experiments in both constant strain rate and constant stress flows of two low-density polyethylene melts. Experimental parameters that include the lubricant viscosity and sample aspect ratio are systematically varied to examine their effect on the viability of the technique in the linear viscoelastic regime by comparing measured quantities to those predicted by finite linear viscoelastic theory. An evaluation is also made by comparing viscosities measured using the lubricated squeezing flow technique and Meissner's rotating clamp (MAD) rheometer in the non-linear regime. In both cases, deviations between the expected and measured viscosities were observed, indicating that the technique is not applicable to large strains for constant strain rate and constant stress flows. It is suggested that this limit is the result of lubricant thinning.

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • M. Kompani
    • 1
  • David C. Venerus
    • 1
  1. 1.Department of Chemical and Environmental Engineering and Center of Excellence in Polymer Science and Engineering Illinois Institute of Technology Chicago, Illinois 60616, USA e-mail: cherenerus@iit.eduUS