TY  - JOUR
AU  - Busch, P.
AU  - Rauscher, M.
AU  - Moulin, J.-F.
AU  - Müller-Buschbaum, P.
TI  - Debye-Scherrer rings from block copolymer films with power-like order
JO  - Journal of applied crystallography
VL  - 44
SN  - 0021-8898
CY  - Copenhagen
PB  - Munksgaard
M1  - PreJuSER-14703
SP  - 370 - 379
PY  - 2011
N1  - 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.
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000288758500014
DO  - DOI:10.1107/S0021889810053823
UR  - https://juser.fz-juelich.de/record/14703
ER  -