Denys Usov

Switching of surface composition and morphology of binary polymer brushes

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Kurzfassung in Englisch

Switching of surface composition and morphology of binary polymer brushes in response to changes in solvent selectivity, heating above glass transition temperatures, and contact with a rubbery stamp was studied. The binary brushes: polystyrene/poly(2-vinyl pyridine) (PS/P2VP), poly(styrene-co-2,3,4,5,6-pentafluorostyrene)/poly(methyl (meth)acrylate) (PSF/P(M)MA), and PS/PMMA were synthesized via two-step surface-initiated radical polymerization. Wetting experiments show that switching of brushes? surface composition upon exposure to solvents of various thermodynamic quality occurs faster than in 6 s. It takes longer time (5-10 min), if rate of solvent diffusion into the brush film is low. Discontinuous switching of surface composition of binary brushes is found upon exposure to binary solvents with gradually changed selectivity. X-ray Photoelectron Spectroscopy (XPS) shows quantitatively that the top brush layer (1) is dominated by respective favourite polymers after exposure to solvents of opposite selectivity and (2) comprises both brush constituents in almost symmetric ratio after exposure to non-selective solvents. Morphologies of binary brushes obtained after exposure to the solvents were studied with Atomic Force Microscopy (AFM). Local top layer composition was sensed with X-ray Photoemission Electron Microscopy (XPEEM). The morphologies are relevant to the particular solvents, reproducible, and independent on previous solvents. Phase segregation beneath the brush top layers was visualized with plasma etching. Qualitative agreement of the experimentally observed morphologies and predicted with self-consistent field theory is found. Enrichment of a binary brush top layer with the polymer providing lower surface energy takes place after annealing. Perpendicular segregation of binary brush constituents was sensed with XPEEM on perpendicular walls of imprinted elevations after wet microcontact printing.

weitere Metadaten

übersetzter Titel
Schalten der Oberflächenzusammensetzung und Morphologie binärer Polymerbürsten
Benetzbarkeit, Ellipsometrie, Kontaktwinkel, Mikrokontaktdruck, Morphologie, NEXAFS, Phasentrennung, Plasmaätzung, Rasterkraftmikroskopie, XPEEM, XPS, binäre Polymerbürste, schaltbare Oberfläche
AFM, NEXAFS, XPEEM, XPS, binary polymer brush, contact angle, ellipsometry, microcontact printing, morphology, phase separation, plasma etching, switchable surface, wettability
SWD SchlagworteBenetzung, Ellipsometrie, Entmischung, Mikrokontaktdruck, Morphologie, NEXAFS, Polymere, Randwinkel, Rasterkraftmikroskopie, Röntgen-Photoelektronenspektroskopie
DDC Klassifikation530
RVK KlassifikationUV 3100
InstitutionTechnische Universität Dresden
AbteilungMathematik und Naturwissenschaften, Chemie, Institut für Polymerforschung Dresden e.V.
BetreuerProf. Dr. Sergiy Minko
GutachterProf. Dr. Karl-Fridrich Arndt
Prof. Dr. Sergiy Minko
Prof. Dr. Manfred Stamm
Tag d. Einreichung (bei der Fakultät)16.10.2003
Tag d. Verteidigung / Kolloquiums / Prüfung26.05.2004
Veröffentlichungsdatum (online)24.04.2004
persistente URNurn:nbn:de:swb:14-1085656171515-51343

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