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- Title
Depth Profiling of Block Copolymer Nanostructures in Films by Small- Angle X-Ray Scattering Using an X- Ray Microbeam.
- Authors
Sakurai, Shinichi; Kimura, Go; Mizuno, Yohei; Masunaga, Hiroyasu; Ogawa, Hiroki; Ohta, Noboru; Yagi, Naoto
- Abstract
We applied the microbeam two-dimensional small-angle X-ray scattering (2d- µSAXS) technique in order to characterize orientation of polystyrene (PS) microdomains as a function of the distance from the free surface of a sample sheet down to the surface facing to the substrate, for depth profiling for spontaneous perpendicular orientation of PS cylinders in the matrix of polyethylenebutylene (PEB) in a PS- b-PEB- b-PS triblock copolymer thick sheet as thick as ∼0.5 mm. It has been revealed that near the free surface the cylinders were randomly oriented down to ∼70 µm in depth. Although this might indicate that the surface effect, which preferentially dictates cylinders to be oriented parallel to the surface, can propagate for such a long distance, 70 µm is unusually huge as compared to the general knowledge of the surface effect propagating at most for 1 µm. Experimentally examining further, we finally conclude that the 2d- µSAXS depth profiling overestimates the surface effect. This unfavorable conclusion may be ascribed to surface roughness of the sample sheet subjected to the measurement, and in order to obtain a good result a big effort is required to prepare the surface as flat as possible.
- Subjects
DEPTH profiling; MICROSTRUCTURE; SMALL-angle X-ray scattering; BLOCK copolymers; SUBSTRATES (Materials science)
- Publication
Macromolecular Symposia, 2013, Vol 327, Issue 1, p121
- ISSN
1022-1360
- Publication type
Article
- DOI
10.1002/masy.201350515