Lattice-fluid binary parameters for phase separated mixtures of PCL-PMMA

CARMEN C. RICCARDI; ELENA SERRANO; WALTER F. SCHROEDER

Blacksburg, Virginia

Congreso; World Polymer Congress - Macro 2012; 2012

Virginia Tech y IUPAC (International Union of Pure and Applied Chemistry)

The lattice theory of Sanchez-Lacombe has been extensively applied to homogeneous blends using pressure-volume-temperature, PVT, data to characterize the interaction between the components. In the framework of this theory, scaling parameters of pure components are obtained by fitting PVT data, while the model parameters are calculated by using mixing rules as a function of lattice-binary interaction parameters. When an equation of state is used to predict the mixing behavior of two substances that give place to a homogeneous solution, it is assumed that both mixture and components obey the same equation of state, that the hard-core volumes are additive and that there are parameters that can take into account interactions between the molecules. To our knowledge, the modeling of PVT data of immiscible mixtures has not been done. In addition to the requirements for miscible blends, the lattice-fluid parameters should be the same for both phases in immiscible blends, which means that they must not depend on the composition. In the present work we applied the Sanchez-Lacombe equation of state to model the PVT behavior of phase separated blends of poly(methyl methacrylate) (PMMA) and poly(ε-caprolactone) (PCL).