G. Bayram et al., VISCOELASTIC PROPERTIES OF SUSPENSIONS WITH WEAKLY INTERACTING PARTICLES, Journal of applied polymer science, 70(3), 1998, pp. 507-514
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 rheomet
er. The rheological tests conducted were the measurement of the storag
e modulus, G', loss modulus, G '', and complex viscosity, eta, as fun
ctions of the frequency and the steady shear viscosity as a function o
f the shear rate. The linear viscoelastic region was determined to ext
end up to 50% strain by measuring G', G '', and eta as functions of s
train 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 relaxati
on 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 ob
served to be valid for these suspensions. (C) 1998 John Wiley & Sons,
Inc.