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PO: Polymerphysik
PO 4: Poster: Oberflächen und Grenzflächen
PO 4.2: Poster
Monday, March 17, 1997, 15:30–17:30, Gg
Structure of ultra-thin liquid crystalline polymer films
— •A. Vix1, W. Stocker1, P. M"uller-Buschbaum2, M. Stamm2, and J.P. Rabe1 — 1Humboldt-Universit"at zu Berlin, Institut f"ur Physik (PMM), Invalidenstra"se 110, 10115 Berlin (Germany) — 2Max-Planck-Institut f"ur Polymerforschung, Ackermannweg 10, 55128 Mainz (Germany)
The development of morphology at the surface of main-chain liquid crystalline polymer films is determined by the structure within the films. Thus for an understanding of the interplay between structure formation at the surface and organisation in the film, X-ray reflection, X-ray diffuse scattering and scanning force microscopy (SFM) investigations have been performed. The interaction between the solid substrate and the thin polymer film strongly influences the internal film structure. The structure formation as a function of sample history and annealing conditions has been investigated. We detect a reversible surface roughening after heating from the smectic to the nematic phase. A similar behaviour was previously found for side-chain liquid crystal polymers [1]. Additionally, the dewetting of the thin liquid crystalline polymer films has been investigated by SFM on time scale of date.
[1] H.Mensinger, M.Stamm, C.Boeffel; J.Chem.Phys. 96, 3183 (1992)