Journal Article

PreJuSER-14703

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Debye-Scherrer rings from block copolymer films with power-like order

Busch, P.FZJ* ; Rauscher, M. ; Moulin, J.-F. ; Müller-Buschbaum, P.

2011
Munksgaard Copenhagen

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Please use a persistent id in citations: doi:10.1107/S0021889810053823

Abstract: The powder-like orientation of lamellar domains in thin films of the diblock copolymer polystyrene-block-poly(methyl methacrylate) is investigated using grazing-incidence small-angle X-ray scattering (GISAXS) and grazing-incidence small-angle neutron scattering (GISANS). Conventional monochromatic GISANS and GISAXS measurements are compared with neutron time-of-flight GISANS. For angles of incidence and exit larger than the critical angle of total external reflection of the polymer, Debye-Scherrer rings are observed. The position of the Debye-Scherrer rings is described quantitatively based on a reduced version of the distorted-wave Born approximation. A strong distortion of the ring shape is caused by refraction and reflections from the film interfaces. Close to the critical angle, the ring shape collapses into a banana shape.

Keyword(s): Basic research (1st) ; Others (1st) ; Soft Condensed Matter (2nd) ; J ; grazing-incidence small-angle scattering (auto) ; GISANS (auto) ; GISAXS (auto) ; powder diffraction (auto) ; distorted-wave Born approximation (auto) ; thin films (auto) ; diblock copolymer (auto)

Note: CHESS is a national user facility supported by the National Science Foundation and the National Institutes of Health/National Institute of General Medical Sciences under award No. DMR-0225180. We thank Sita Krishnan for the preparation of the semifluorinated diblock copolymer sample. PMB acknowledges financial support by the Deutsche Forschungsgemeinschaft in project No. MU1487/6.

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Contributing Institute(s):

1. Streumethoden (PGI-4)
2. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
3. Neutronenstreuung (JCNS-1)
4. Streumethoden (JCNS-2)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Experiment(s):

1. KWS-2: Small angle scattering diffractometer (NL3ao)
2. REFSANS: Horizontal TOF Reflectometer with GISANS option (NL2b)

Appears in the scientific report 2011

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