“…[1,4,6] This is because the low surface energy component in multicomponent polymeric systems is usually preferentially concentrated at the air surface region in order to minimize the air/material interfacial free energy. [3,5,7,[11][12][13] Other variables affecting the surface structure in multicomponent polymeric systems have been revealed, including composition, intermolecular interaction, morphology, molecular weight, and sampling method. Recently, Liu et al [8] investigated the surface structure of poly(styrene-co-p-hexafluorohydroxyisopropyl-a-methylstyrene)/ poly(4-vinylpyridine) (PSOH/PVPy) blends which span a wide range of structure, through immiscibility-miscibility-complexation transitions, by varying the hydroxyl content of PSOH.…”