Determination of both the binodal and the spinodal curves in polymer blends by shear rheology
Foundation for Research and Technology - Hellas,
Institute of Electronic Structure and Laser,
P.O. Box 1527, 711 10 Heraklion Crete, Greece
Accepted: 17 April 1996
The thermorheological complexity at low frequencies in polymer blends near macrophase separation is quantitatively accounted for. The behaviour of both storage, G', and loss, G'', moduli at low frequencies as the temperature, T, approaches phase separation is due to the critical concentration fluctuations in the one-phase region. The temperature at maximum slope of the G' vs. T dependence at low frequencies is identified with the cloud point curve, whereas a plot of vs. 1/T leads to the identification of the spinodal temperature.
PACS: 61.41.+e – Polymers, elastomers, and plastics / 64.70.Ja – Liquid-liquid transitions / 68.10.Et – Interface elasticity, viscosity, and viscoelasticity
© EDP Sciences, 1996