Vapor-liquid equilibria for binary solutions of some comb polymers based on poly(styrene-co-maleic anhydride) in acetone, methanol and cyclohexane

Vapor-liquid equilibria have been measured for comb and linear polymers using a gravimetric-sorption method in the temperature range 50–70°C. Polymers were poly(styrene-co-maleic anhydride) with alkyl side chains of different length (C5, C12, C22) and poly(styrene-co-maleic anhydride) and poly(maleic anhydride). Solvents were acetone, methanol and cyclohexane. Due to different chemical structures, the phase behavior of the comb polymer solutions strongly depends on the ratio backbone/side chains. Freedʹs lattice-cluster theory gives a good representation of the data.