Rheologically Determined Phase Behavior of an all-Polymer Nanocomposite

Phase separation of an all-polymer nanocomposite containing poly (methyl methacrylate-co-butyl acrylate) with 30 wt% methyl methacrylate (MBC30) as matrix and 5 wt% of mono-size poly (styrene-co-acrylonitrile) soft nanoparticle with 70 wt% styrene (SAN70) were investigated. Rheology was used to determine the binodal and spinodal phase separation temperatures based on inflection point of storage modulus and mean field theory. The measured temperature agrees very well with the DSC results