Self-organization and aggregation of amphiphilic block copolymers of N-vinylpyrrolidone-block-2,2,3,3-tetrafluoropropylmethacrylate at interfaces

The physicochemical characteristics of monolayer formation of amphiphilic block copolymers of N-vinylpyrrolidone-block-2,2,3,3-tetrafluoropropylmethacrylate (PVP-block-PFMA) with different molecular weights (M (w)) at the water-air interface and on the solid support (quartz, silicon) were studied. It was shown by UV and IR spectroscopy, analysis of the theta-S compression isotherms, and imaging by atomic force microscopy (AFM) that the state of PVP-block-PFMA monolayers on the aqueous subphase and solid support is determined by the ratio of M (w) of comonomer blocks M (w)(PFMA)/M (w) (PVP), the aggregation of copolymers in solution and in the surface layer (surface micellation and phase isolation). Gibb's surface energy of the films calculated in the Wendt-Good-Kaelbly-Dan-Fowkes approximation increases up to 30-33 mJ m(-2) from 21 mJ m(-2) (PFMA). The values of adhesion work W (adh)(monolayer-water droplet-air) and W (adh)(monolayer-water in octanol) and AFM imaging characterize the lipophilicity and surface topology of the films as optimal for thromboresistant materials.