The size dependent miscibility of binary polymer blend films of polystyrene (PS) and
tetramethylbisphenol-A polycarbonate (TMPC) is studied by the molecular dynamics (MD)
simulation in the way of computing Flory-Huggins interaction parameter, χ, of the blend films,
which determines the blend films compatibility. It is found that the miscibility of the two polymers
decreases as the film thickness D decreases. After that, the size dependent glass transition
temperature Tg(w,D) of the two polymers blend films in miscible ranges are determined by
computer simulation and the Fox equation where w is the weight fraction of the second component.
