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Low‐rate dynamic contact angles of water, glycerol and methylene iodide on polystyrene and poly(4‐(X = CH3, (CH3)3, Cl, OH)‐styrene) films were measured by axisymmetric drop shape analysis‐profile (ADSA‐P) for sessile drops. It was found that glycerol in the case of poly(4‐chlorostyrene) and methylene iodide on all investigated surfaces did not yield constant contact angles: dissolving of the polymer during the contact with the liquid, penetration effects and stick/slip behavior were found. Water and glycerol yielded meaningful constant contact angles (except for glycerol on poly(4‐chlorostyrene), for which we used formamide additionally). From these meaningful contact angles the solid surface tensions of the modified polymers were calculated using the equation of state approach [6]. The following values of γsv were determined: polystyrene γsv = 28.3 mJ/m2, poly(4‐methylstyrene) γsv = 25.8 mJ/m2, poly(4‐tert‐butylstyrene) γsv = 22.0 mJ/m2, poly(4‐hydroxystyrene) γsv = 44.1 mJ/m2, poly(4‐chlorostyrene) γsv = 27.2 mJ/m2.

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