M. Kapnistos et al., DETERMINATION OF BOTH THE BINODAL AND THE SPINODAL CURVES IN POLYMER BLENDS BY SHEAR RHEOLOGY, Europhysics letters, 34(7), 1996, pp. 513-518
The thermorheological complexity at low frequencies in polymer blends
near macrophase separation is quantitatively accounted for. The behavi
our 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 a
t maximum slope of the G' vs. T dependence at low frequencies is ident
ified with the cloud point curve, whereas a plot of [(G '')(2)/(G'T)](
2/3) vs. 1/T leads to the identification of the spinodal temperature.