Role of dissimilar interfaces in thin films of cylinder-forming block copolymers

Lyakhova, K. S.; Sevink, G. J. A.; Zvelindovsky, Andrei; Horvat, A.; Magerle, R.

doi:10.1063/1.1632475

Cited by 74 publications

(131 citation statements)

References 40 publications

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“…Besides the pertinent factors applying to ordering in bulk samples, in thin films the interaction of the blocks with the substrate and air interfaces and the film thickness are equally important parameters on which the final microphase-separated structure depends. [17][18][19][20][21][22][23][24][25][26][27] Usually preferential wetting of one of the blocks at an interface leads to a parallel orientation of the microdomains, and when the thickness of the film is incommensurate with the lamellar (or cylindrical/spherical) period, quantization of the film thickness takes place by the formation of terraces. 3,20,[27][28][29] When the interaction with the surface is very strong, a polymer brush may form at the surface.…”

Section: Introductionmentioning

confidence: 99%

Phase Behavior of Solvent Vapor Annealed Thin Films of PS-b-P4VP(PDP) Supramolecules

et al. 2008

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Phase behavior of solvent vapor annealed thin films of PS-b-P4VP(PDP) supramolecules van Zoelen, Wendy; Asumaa, Terhi; Ruokolainen, Janne; Ikkala, OlliI; ten Brinke, Gerrit Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. FIN-02015 HUT Espoo, Finland ReceiVed December 13, 2007; ReVised Manuscript ReceiVed February 12, 2008 ABSTRACT: The phase behavior and terrace formation of solvent (chloroform) vapor annealed thin films of asymmetric comb-shaped supramolecules consisting of a polystyrene (PS) block and a supramolecular block of poly(4-vinylpyridine) (P4VP) hydrogen bonded with pentadecylphenol (PDP) on silicon oxide (SiO 2 ) were examined. P4VP(PDP) was found to be present at the SiO 2 interface as well as the air interface, implying symmetric boundary conditions. Because of the inherent change in composition by swelling in a selective solvent, the morphology of a lamellar film could be changed to cylindrical by swelling at different vapor pressures of chloroform vapor. Swelling at a specific vapor pressure at the phase boundary between lamellar and cylindrical resulted in noncommon terrace formation behavior. The lowest terrace consisted of two wetting layers forming one lamella, the second terrace contained perpendicular lamellae, and the highest terrace consisted of parallel P4VP(PDP) cylinders. The results are presented in a morphology diagram as a function of film thickness and composition.

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Section: Introductionmentioning

confidence: 99%

Phase Behavior of Solvent Vapor Annealed Thin Films of PS-b-P4VP(PDP) Supramolecules

et al. 2008

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“…A block interacting preferentially with the substrate surface or free surface wets the corresponding interface and induces preferential orientation of nanodomains [133][134][135][136][137][138]. Minimization of the surface energies drives the selective wetting.…”

Section: Self-assembly In Thin Filmsmentioning

confidence: 98%

Dynamic Assembly of Block-Copolymers

Quémener¹,

Deratani²,

Lecommandoux³

2011

Constitutional Dynamic Chemistry

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Block copolymers (BCs) are well-known building blocks for the creation of a large variety of nanostructured materials or objects through a dynamic assembly stage which can be either autonomous or guided by an external force. Today's nanotechnologies require sharp control of the overall architecture from the nanoscale to the macroscale. BCs enable this dynamic assembly through all the scales, from few aggregated polymer chains to large bulk polymer materials. Since the discovery of controlled methods to polymerize monomers with different functionalities, a broad diversity of BCs exists, giving rise to many different nanoobjects and nanostructured materials. This chapter will explore the potentialities of block copolymer chains to be assembled through dynamic interactions either in solution or in bulk.

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“…On a coarse-grained time scale, there is a certain collective particle density field r I (r) of the beads of type I. Given this density field, the free-energy functional F[r] can be written as follows [25]: (1)…”

Section: Modelmentioning

confidence: 99%

Effect of steady shear on multi-axial texture of symmetric diblock copolymers

Liu

2007

Front. Chem. Eng. China

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The effect of steady shear on multi-axial texture of symmetric diblock copolymer was investigated by using dynamic density functional theory. Through modifying the periodic boundary condition, the parallel-transverse biaxial texture and perpendicular-parallel-transverse triaxial texture have been observed. In the formation of the multi-axial texture, there are two critical velocities u per par -* and u par tra -* , at which the transition between the perpendicular and the parallel lamellar morphology, and the transition between the parallel and the transverse lamellar morphology occur, respectively. The two critical velocities increase as the interaction parameter increases, but they almost remain constant at different shear rates. Furthermore, the rotation from the transverse lamellae to the parallel lamellae induced by the shear strain, and the increase of lamellar spacings of the three lamellae after removing the shear, have also been observed by the time evolution of the morphologies. These phenomena are consistent with experimental work.

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Role of dissimilar interfaces in thin films of cylinder-forming block copolymers

Cited by 74 publications

References 40 publications

Phase Behavior of Solvent Vapor Annealed Thin Films of PS-b-P4VP(PDP) Supramolecules

Phase Behavior of Solvent Vapor Annealed Thin Films of PS-b-P4VP(PDP) Supramolecules

Dynamic Assembly of Block-Copolymers

Effect of steady shear on multi-axial texture of symmetric diblock copolymers

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