Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 2: Interfaces and Thin Films I (joint session with DECHEMA and VDI)

CPP 2.14: Talk

Monday, March 11, 2013, 13:15–13:30, H40

Fast formation of roughness correlation in thin spray-coated polystyrene homopolymer film — •Jan Perlich, Adeline Buffet, Matthias Schwartzkopf, Gerd Herzog, Berit Heidmann, Stephan V. Roth, and Rainer Gehrke — Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, D-22607 Hamburg (Germany)

Thin polymer films form smooth films with correlated interfaces, so-called conformal roughness, under suitable preparation conditions in dependence of the polymer characteristics [1,2]. The directed replication of the substrate features to a certain cut-off length is highly desirable. Hence, insight into the formation process is required. We present the fabrication of such a thin film of a polystyrene homopolymer via spray-coating. The spray-coating process is monitored in situ real-time by microbeam grazing incidence small angle X-ray scattering (microbeam-GISAXS) performed at the synchrotron beamline P03 (MiNaXS) of PETRA III (DESY) in Hamburg [3]. The dedicated in situ setup provides a time resolution in the millisecond regime enabling the observation of the fast formation of roughness correlation in the thin film upon drying of the polystyrene homopolymer solution. The recorded scattering signals reveal the information to extract the evolution of the correlation and cut-off lengths as well as the corresponding time constants in the formation process.

[1] P. Müller-Buschbaum et al., Macromolecules 31 (1998) 3686.

[2] J. S. Gutmann et al., Physica B 283 (2000) 40.

[3] A. Buffet et al., J. Synchrotron Rad. 19 (2012) 647.