Investigation of the interactions and phase behavior in poly(dimethylsiloxane) and poly(methylphenylsiloxane) blends

Abstract

Mixtures of linear poly(dimethylsiloxanes) (PDMS) and poly(methylphenylsiloxanes) (PMPS) with narrow molar mass distributions was studied by a static wide-angle light scattering technique. Reversible-phase separations were exhibited as cloud temperatures at and below their respective critical temperatures. An upper critical solution temperature (UCST) behavior was found, and the critical temperature increased with increasing molar mass of the PMPS component. The data were analyzed to determine the PDMS/PPMS interaction parameter as a function of temperature and concentration