Surface properties and structures of diblock copolymer and homopolymer with perfluoroalkyl side chains

Composition and solution properties of fluorinated block copolymers and their surface structures in the solid state

“…The spectra were resolved into five Gaussian curve-fitted peaks: -CF 3 around 294.0 eV, -CF 2 -around 291.5 eV, -C== O around 288.5 eV, -C-O -C== O around 286.5 eV, and hydrocarbon (-CH n : n = 0-3) around 285.0 eV, from high to low binding energy. The peak assignments agree well with previously reported values [6,10,11] . Table 2 summarizes the composition of the functional groups at various probe depths of the copolymer films.…”

“…The F 1s /C 1s ratio of the copolymer surface dramatically increased to 0.6 with only one FMA unit. The F 1s /C 1s ratios of thePMMA 144 -b-PFMA n films were almost the same when the number of FMA units increased from 1 to 4, and then increased gradually to 0.86 for PMMA 144 -b-PFMA 10 . In order to understand the effect of the PFMA block length on the surface enrichment of the fluorinated species, the surface composition of the diblock copolymers with 0.7 and Table 1 Characteristics of PMMA 144 -b-PFMA n block copolymers used in this study Samples …”

“…The contact angles maintained constant values until the number of FMA units increased to four. However, the water and oil angles of the copolymer film decreased by about 6° and 9°, respectively, when the PFMA block units increased to 10.…”

“…When the PFMA block length increased to 10 units, the hydrodynamic diameters of the aggregates increased to about 200 nm. Urushihara et al [10] proposed that the aggregates with hydrodynamic diameter below 10 nm corresponded to unimers; however, the aggregates with hydrodynamic diameters of above 100 nm were micelles composed of a PMMA corona and a PFMA core in solution. The micelles and unimers coexisted in solution when the fluorine content in the copolymer was very low.…”

Solvent effect on the film formation and the stability of the surface properties of poly(methyl methacrylate) end-capped with fluorinated units

“…The undesired surface reconstruction effects can likely be minimized by increasing the packing density of the self-assembled fluorocarbon chain monolayers [6]. It is well known that low surface free energy fluorinated moieties always preferentially occupy the airpolymer interface via the process of surface segregation, which is affected by solvent when the film is prepared using a polymer solution [11,12]. In order to use very small amounts of fluorinated species to obtain optimally low wettability, poly(butyl methacrylate) and poly(methyl methacrylate) end-capped with 2-perfluorooctylethyl methacrylate (FMA) units were synthesized, and their surface properties were investigated [13,14].…”