|265. Sperschneider, A.; Schacher, F.H.; Gawenda, M.; Tsarkova, L.; Müller, A.H.E.; Ulbricht, M.; Krausch, G.; Köhler, J.: Towards Nanoporous Membranes based on ABC Triblock Terpolymers, Small 3(6), 1056-1063 (2007) -- DOI: 10.1002/smll.200600579 -- PDF|
Block copolymers represent an exciting class of complex materials as they self-assemble into highly regular structures of nanoscopic dimensions. When prepared in thin films, such structures can be used for a variety of applications including lithographic masks or nanoporous membranes. In this contribution we report about nanostructures in thin films of structurally analogous polybutadiene-block-poly(2-vinyl pyridine)-block-poly(tert-butyl methacrylate) (BVT) and polystyrene-block-poly(2-vinyl pyridine)-block-poly(tert-butyl methacrylate) (SVT) triblock terpolymers which were synthesized via sequential living anionic polymerization. The morphological behavior of annealed SVT and BVT films was investigated by scanning force and scanning electron microscopies. We demonstrate that the difference in the terpolymer composition results in the formation of ordered perforated lamella phase in SVT films and of hexagonally packed core-shell cylinders in BVT films. Further, the BVT films show high potential for the fabrication of composite membranes using track-etched poly(ethylene terephthalate) macroporous filters as a support.
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- Projekt: Volkswagen-Stiftung: Schaltbare, nanoporöse Membranen auf Basis von Blockcopolymeren