Scattering Study on the Selective Solvent Swelling Induced Surface Reconstruction

Autor:	Thomas P. Russell, Ben Ocko, Alain Gibaud, James T. Goldbach, Seung-Hyun Kim, Oleg Gang, Charles T. Black, Kathryn W. Guarini, Craig J. Hawker, Ting Xu, Matthew Jeremiah Misner
Rok vydání:	2004
Předmět:	Electron density Materials science Polymers and Plastics Scattering Nanoporous Organic Chemistry Analytical chemistry Methacrylate Inorganic Chemistry Lattice constant Polymer chemistry Materials Chemistry medicine Thin film Swelling medicine.symptom Surface reconstruction
Zdroj:	Macromolecules. 37:2972-2977
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma0355204
Popis:	A selective solvent induced surface reconstruction of thin films of an asymmetric diblock copolymer of poly(styrene-b-methyl methacrylate) was investigated by grazing incidence small-angle X-ray scattering, X-ray reflectivity, and atomic force microscopy. It is quantitatively shown that the selective swelling of the minor component results in the formation of a nanoporous film where the initial hexagonal array of the copolymer is preserved without affecting the lattice constant, 40.7 nm. However, the film thickness increased by ∼17%, and the average electron density decreased by ∼20%. The electron density profiles obtained by fitting the X-ray reflectivity indicate that the pores penetrate through the entire film and that the pores are oriented normal to the surface.
Databáze:	OpenAIRE
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