| 资料简介： |
Rheological methods have been frequently used to study the phase separation behavior of partially miscible
polymer blends. Usually the binodal temperature can be determined from the failure of timeetemperature
superposition (TTS) principle in isothermal experiments, or the deviation of the storage modulus from the
apparent extrapolation of modulus in miscible regime in non-isothermal experiments. However, these
methods are shown in thiswork to be not widely applicable even in blends withweak dynamic asymmetry
due to the thermo-rheological complexity. A rheological model which is an integration of the double
reptation model and the self-concentration model is found to describe the linear viscoelasticity of miscible blends quite satisfactorily, fromwhich it is possible to followthe contribution from the miscible blends even in the two phase regime. Then, the binodal temperature is readily defined as the deviation of experimental data fromsuchmodel prediction for miscible blends. Such method is successfullyapplied in amodel polymer blend (poly(methyl methacrylate)/poly(styrene-co-maleic anhydride), PMMA/SMA) with weak dynamic asymmetry. |