Abstract
The polymerization-induced biphasic nature of an emulsion 30/70wt.% methyl methacrylate (MMA)/butyl acrylate (BA) copolymer was deeply scrutinized with different techniques as the MMA-rich/BA-rich copolymers blend. Its experimentally found upper critical solution temperature (UCST) was then confirmed by the Sanchez-Lacombe lattice fluid (SLLF) and compressible regular solution (CRS) models. Characterization of soft polymer nanocomposites (SPNs) from the aforementioned system as the matrix and different fractions of mono-size poly(styrene-co-acrylonitrile) soft nanoparticles made of 70wt.% styrene (SAN70) with dynamic mechanical thermal analysis (DMTA), atomic force microscopy (AFM), and rheometry approved their multi-phase character. Homogenization temperatures of the matrix components along with the phase separations of MMA-rich/SAN70 copolymers were concurrently determined by applying Ajji and Choplin’s mean field theory on rheological measurements as a closed loop-like phase diagram. Granular state assumption regarding the soft nanoparticles by imposing geometrical constraints on their interactions based on the generalized SLLF model led to acceptable predictions about the observed lower critical solution temperature (LCST) phase behavior.
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