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

Abstract

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 (Mw) 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 θ—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 Mw of comonomer blocks Mw(PFMA)/Mw(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 Wadh(monolayer—water droplet—air) and Wadh(monolayer—water in octanol) and AFM imaging characterize the lipophilicity and surface topology of the films as optimal for thromboresistant materials.