Dresden 2003 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 22: POSTER C

CPP 22.38: Poster

Donnerstag, 27. März 2003, 12:00–14:00, ZEU/250

Nanoporous Membranes from PS-b-P2VP-b-PtBMA Triblock Copolymers — •Sabine Ludwigs¹, Alexander Böker¹, Andrej Voronov¹, and Georg Krausch^1,2 — ¹Physikalische Chemie II, — ²Bayreuther Zentrum für Kolloide und Grenzflächen (BZKG), Universität Bayreuth, 95440 Bayreuth, Germany

Using sequential living anionic polymerization we synthesized a series of monodisperse polystyrene-b-poly(2-vinylpyridine)-b-poly(tert-butyl methacrylate) triblock copolymers (SVT) with increasing molecular weight of the PtBMA block¹.

Thin films of these triblock copolymers self-assemble into highly regular and long-range oriented nanostructures after exposure to solvent vapor² which may be chemically modified after the structure formation.

In this contribution we discuss a triblock copolymer exhibiting a core-shell cylinder structure in bulk (φ_S = 0.16, φ_V = 0.21 und φ_T = 0.63, M_w = 140 kg/mol; M_w/M_n = 1.02). The thin film morphology may be best interpreted as ’perforated lamellae’ with a PS-core and a P2VP-shell in the PtBMA matrix phase. We show that a chemical modification of the poly(tert-butyl methacrylate) matrix phase to poly(methacrylic acid) via acid-catalyzed saponification may lead to pH-responsive nanostructures, while nanoporous membranes can be created by selective UV-depolymerization of the PtBMA matrix phase.

¹ Ludwigs, S.; Böker, A.; Abetz, V.; Müller, A. H. E.; Krausch, G. Macromolecules 2002, submitted.
² Elbs, H.; Drummer, C.; Abetz, V.; Krausch, G. Macromolecules 2002, 35, 5570.