Journal
JOURNAL OF APPLIED CRYSTALLOGRAPHY
Volume 44, Issue -, Pages 370-379Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S0021889810053823
Keywords
grazing-incidence small-angle scattering; GISANS; GISAXS; powder diffraction; distorted-wave Born approximation; thin films; diblock copolymer
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Funding
- National Science Foundation
- National Institutes of Health/National Institute of General Medical Sciences [DMR-0225180]
- Deutsche Forschungsgemeinschaft [MU1487/6]
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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.
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