Polystyrene–Polyperfluorooctylethyl acrylate Diblock Copolymers: The Effect of Dilution of the Fluorinated Mesogenic Chains on Bulk and Surface Properties
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Polystyrene–Polyperfluorooctylethyl acrylate Diblock Copolymers: The Effect of Dilution of the Fluorinated Mesogenic Chains on Bulk and Surface Properties
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<jats:title>Abstract</jats:title><jats:p><jats:bold>Summary</jats:bold>: Three smectic poly(styrene‐<jats:italic>b</jats:italic>‐perfluorooctylethyl acrylate) block copolymers (S‐<jats:italic>b</jats:italic>‐AF8) with different degrees of polymerization (<jats:italic>n</jats:italic>, <jats:italic>m</jats:italic>) of the relative blocks were synthesized by atom transfer radical polymerization (S, <jats:italic>n</jats:italic> = 25; AF8 <jats:italic>m</jats:italic> = 2, 6, 23). The mesophase structure and transition temperatures were investigated by DSC and WAXD. The block copolymer having the shortest fluorinated block was blended with a thermoplastic elastomer SEBS in different proportions, in order to look at the effect of a further dilution of the perfluorinated groups on non‐wetting properties. Thin films of the block copolymers as well as the blends exhibited large contact angles with both water and <jats:italic>n</jats:italic>‐hexadecane, which resulted in low solid surface tensions. XPS findings at different photoemission angles confirmed the effective surface segregation of the mesogenic chains of the fluorinated polymer block.</jats:p>