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PO: Polymerphysik

PO 2: Phasenverhalten und Strukturbildung

PO 2.3: Talk

Wednesday, March 11, 1998, 11:25–11:45, Audimax

Structure formation in thin polymer blend films — •J. S. Gutmann, P. M"uller-Buschbaum, and M. Stamm — Max-Planck-Institut f"ur Polymerforschung, Ackermannweg 10, D- 55128 Mainz

The morphology of thin multi component polymer films is the result of a delicate interplay between the preparation conditions, the miscibility of the polymers in the blend and the wettability of the surface by the individual polymers [1]. Polymer blends of polystyrene and para-bromo-polystyrenes with different degrees of bromation were used to investigate structure formation during the spin-coating process. The molecular weights of the used polymers vary from 225k to 380k. The resulting morphologies were examined by optical, phase interference and atomic force microscopy. Specular and off-specular x-ray reflection experiments were conducted to yield an information about structures perpendicular to the surface as well as lateral structures [2]. A variation of blend composition, miscibility and substrates gave rise to distinct differences in the resulting morphologies. Perpendicular to the surface a switch from the polymer-surface interaction to the polymer-polymer interaction as the driving force in structure formation was observed.

[1] S. Affronsman, G. Henn, S. A. O’Neil, R. A. Pethrick, M. Stamm; Macromolecules 29, 5010 (1996)

[2] S. K. Sinha; Current Opinions in Solid State & Material Science 1, 645 (1996)