Surfaces of Semi-fluorinated Block Copolymers Studied Using Nexafs
نویسندگان
چکیده
The molecular orientation within a surface liquid crystalline layer made up of semifluorinated side-groups [-CO-(CH2)x-1-(CF2)yF] (SF groups) attached to the isoprene block of a styrene-isoprene diblock copolymer was determined by analyzing the partial electron yield Cedge NEXAFS signal. The results show that in contrast to the bulk, where the SF groups lie parallel to the diblock copolymer lamellae and thus parallel to the surface, the surface SF groups make an average angle with the surface normal of between 29 and 46° depending on x and y.
منابع مشابه
Anti-biofouling properties of comblike block copolymers with amphiphilic side chains.
Surfaces of novel block copolymers with amphiphilic side chains were studied for their ability to influence the adhesion of marine organisms. The surface-active polymer, obtained by grafting fluorinated molecules with hydrophobic and hydrophilic blocks to a block copolymer precursor, showed interesting bioadhesion properties. Two different algal species, one of which adhered strongly to hydroph...
متن کاملControl of surface properties using fluorinated polymer brushes produced by surface-initiated controlled radical polymerization.
Surface-grafted styrene-based homopolymer and diblock copolymer brushes bearing semifluorinated alkyl side groups were synthesized by nitroxide-mediated controlled radical polymerization on planar silicon oxide surfaces. The polymer brushes were characterized by X-ray photoelectron spectroscopy (XPS), near-edge X-ray absorption fine structure (NEXAFS), and time-dependent water contact angle mea...
متن کاملA general approach to controlling the surface composition of poly(ethylene oxide)-based block copolymers for antifouling coatings.
To control the surface properties of a polystyrene-block-poly(ethylene oxide) diblock copolymer, perfluorinated chemical moieties were specifically incorporated into the block copolymer backbone. A polystyrene-block-poly[(ethylene oxide)-stat-(allyl glycidyl ether)] [PS-b-P(EO-stat-AGE)] statistical diblock terpolymer was synthesized with varying incorporations of allyl glycidyl ether (AGE) in ...
متن کاملEnvironmentally Responsive Block Copolymers as Anti-biofouling Surfaces
Biofouling of ship-hulls is a problem of significant economic and environmental consequences. The accumulation of ‘slimes’ of microorganisms such as bacteria, green algae and diatoms, followed by the attachment of macroorganisms such as hydroids, sponges and barnacles, causes increased frictional drag on ships, higher consumption of fuel, and greater emission of greenhouse gases [1]. That marin...
متن کاملGold/semi-fluorinated Block Copolymer Nanocomposites Developed in Thin Film with Annealing
The self-assembly of block copolymers (BCPs) into a nanostructure with novel morphology and property has attracted an increasing interest as a new approach for materials science, chemical synthesis, and nanofabrication [1,2]. Recently, rod-coil block copolymers have received a great deal of attention since they offer an attractive strategy for the organization of many highly functional rod-like...
متن کامل