Vapor-liquid equilibria (VLE) for butyl acetate + polystyrene with five different molar masses at 308.15 K and for diethyl ether + poly(butyl methacrylate) with three different molar masses at 298.15 K measured by the static quartz-spring gravimetric method are presented. For the first system, the reduced pressure p1/p1-degree versus mass fraction w1 of solvent 1 was found to be independent of the molar mass of the polymer within experimental error, while for the second system, a notable dependence was observed. Flory-Huggins parameters CHI calculated from the VLE results are also presented which show not only a concentration dependence, but also a weak molar-mass dependence for the first system and a strong molar-mass dependence for the second system.