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Polymers 2018, 10(6), 597;

Lateral Order and Self-Organized Morphology of Diblock Copolymer Micellar Films

Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan
Author to whom correspondence should be addressed.
Received: 30 April 2018 / Revised: 22 May 2018 / Accepted: 24 May 2018 / Published: 29 May 2018
(This article belongs to the Special Issue Phase Behavior in Polymers)
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We report the lateral order and self-organized morphology of diblock copolymer polystyrene-block-poly(2-vinylpyridine), P(S-b-2VP), and micelles on silicon substrates (SiOx/Si). These micellar films were prepared by spin coating from polymer solutions of varied concentration of polymer in toluene onto SiOx/Si, and were investigated with grazing-incidence small-angle X-ray scattering (GISAXS) and an atomic force microscope (AFM). With progressively increased surface coverage with increasing concentration, loosely packed spherical micelles, ribbon-like nanostructures, and a second layer of spherical micelles were obtained sequentially. Quantitative analysis and simulations of the micellar packing demonstrates that the spatial ordering of the loosely packed spherical micelles altered from short-range order to hexagonal order when the micellar coverage increased from small to moderate densities of the covered surface. At large densities, anisotropic fusion between spherical micelles caused the ribbon-like nanostructures to have a short-range spatial order; the ordering quality of the second layer was governed by the rugged surface of the underlying layer because the valleys between the ribbon-like nanostructures allowed for further deposition of spherical micelles. View Full-Text
Keywords: block copolymer; micelle; self-assembly; thin film; GISAXS block copolymer; micelle; self-assembly; thin film; GISAXS

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Liou, J.-Y.; Sun, Y.-S. Lateral Order and Self-Organized Morphology of Diblock Copolymer Micellar Films. Polymers 2018, 10, 597.

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