Viscoelastic properties of suspensions with weakly interacting particles


BAYRAM G. , Yilmazer U., Orbey N.

JOURNAL OF APPLIED POLYMER SCIENCE, vol.70, no.3, pp.507-514, 1998 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 70 Issue: 3
  • Publication Date: 1998
  • Title of Journal : JOURNAL OF APPLIED POLYMER SCIENCE
  • Page Numbers: pp.507-514
  • Keywords: suspensions, suspension rheology, viscoelastic properties, Cox-Merz rule, relaxation times, CONCENTRATED SUSPENSIONS, RHEOLOGICAL BEHAVIOR, YIELD STRESS, CARBON-BLACK, LIQUIDS, SYSTEMS, MELTS

Abstract

Rheological characterization of a model suspension containing hydroxyl-terminated polybutadiene and glass beads with filler concentration up to 30% by volume was performed by using a Haake parallel disk rheometer. The rheological tests conducted were the measurement of the storage modulus, G', loss modulus, G ", and complex viscosity, eta*, as functions of the frequency and the steady shear viscosity as a function of the shear rate. The linear viscoelastic region was determined to extend up to 50% strain by measuring G', G ", and eta* as functions of strain amplitude. By using multiple gap separations between the disks, it was found that the suspension did not exhibit slip at the walls of the rheometer. G' and G " were used to determine the relaxation times distribution, G(i)(lambda(i), empty set) as functions of the relaxation time, lambda(i), and the filler content, empty set. The relaxation moduli, G(i)(lambda(i), empty set), decreased with the relaxation time, but increased with the filler content. The Cox-Merz rule was also observed to be valid for these suspensions. (C) 1998 John Wiley & Sons, Inc.