Debye-Scherrer rings from block copolymer films with powder-like order

被引：38

作者：

Busch, Peter ^{[5
]}

Rauscher, Markus ^{[3
,4
]}

Moulin, Jean-Francois ^{[2
]}

Mueller-Buschbaum, Peter ^{[1
]}

机构：

[1] Tech Univ Munich, Lehrstuhl Funkt Mat, Phys Dept E13, D-85747 Garching, Germany

[2] Helmoltz Zentrum Geesthacht, Inst Werkstofforsch, D-21502 Geesthacht, Germany

[3] Univ Stuttgart, Inst Theoret & Appl Phys, D-70569 Stuttgart, Germany

[4] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

[5] Forschungszentrum Julich, Outstn FRM 2, Julich Ctr Neutron Sci, D-85747 Garching, Germany

来源：

JOURNAL OF APPLIED CRYSTALLOGRAPHY | 2011年 / 44卷

基金：

美国国家科学基金会; 美国国家卫生研究院;

关键词：

grazing-incidence small-angle scattering; GISANS; GISAXS; powder diffraction; distorted-wave Born approximation; thin films; diblock copolymer; X-RAY-SCATTERING; ANGLE NEUTRON-SCATTERING; THIN POLYMER-FILMS; GRAZING-INCIDENCE; LIQUID-CRYSTALLINE; SURFACE; GISAXS; SIMULATION; REFLECTIVITY; ORIENTATION;

D O I：

10.1107/S0021889810053823

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：370 / 379

页数：10

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