Ordering Phenomena in Thin Block Copolymer Films Studied Using Atomic Force Microscopy

Dijk, Marc A. van; Berg, R. van den

doi:10.1021/ma00124a011

Cited by 185 publications

(177 citation statements)

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“…It is hard to sketch a complete picture of the film behavior with the help of the experimental data [22][23][24][25][26][27][28][29][30][31] and theoretical investigations, 32,33 published in the literature. Our research will focus on block copolymers, that form cylindrical domains in the bulk melt.…”

Section: A Block Copolymer Thin Filmsmentioning

confidence: 99%

“…30 Various observations have been made for thin films (Ͻ2D). In example, it is thought that perpendicular oriented cylinders are formed in unconfined films of PS-PB-PS ͑30% S͒ supported by a solid substrate, 25 channellike structures have been observed in free standing films of PS-PB ͑30% S͒ ͑Refs. 28, 31͒ and other noncylindrical morphologies, have been observed too.…”

Section: A Block Copolymer Thin Filmsmentioning

confidence: 99%

“…25, 30͒ studies. From AFM experiments 25 it had been concluded that the thinnest areas of the triblock copolymer films have a C Ќ morphology. However, we think that what was called a C Ќ phase is in fact a CL ʈ phase.…”

Section: Phase Behavior In a Slitmentioning

confidence: 99%

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Asymmetric block copolymers confined in a thin film

Huinink

Brokken-Zijp

Dijk

et al. 2000

The Journal of Chemical Physics

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We have used a dynamic density functional theory ͑DDFT͒ for polymeric systems, to simulate the formation of micro phases in a melt of an asymmetric block copolymer, A n B m ( f A ϭ1/3), both in the bulk and in a thin film. In the DDFT model a polymer is represented as a chain of springs and beads. A spring mimics the stretching behavior of a chain fragment and the spring constant is calculated with the Gaussian chain approximation. Simulations were always started from a homogeneous system. We have mainly investigated the final morphology, adopted by the system. First, we have studied the bulk behavior. The diblock copolymer forms a hexagonal packed array of A-rich cylinders, embedded in a B-rich matrix. Film calculations have been done by confining a polymer melt in a slit. Both the slit width and surface-polymer interactions were varied. With the outcomes a phase diagram for confined films has been constructed. Various phases are predicted: parallel cylinders (C ʈ ), perpendicular cylinders (C Ќ ), parallel lamellae (L ʈ ), and parallel perforated lamellae (CL ʈ ). When the film surfaces are preferentially wet by either the A or the B block, parallel oriented microdomains are preferred. A perpendicular cylindrical phase is stable when neither the A nor B block preferentially wets the surfaces. The predicted phase diagram is in accordance with experimental data in the literature and explains the experimentally observed differences between films of asymmetric block copolymers with only two parameters: the film thickness and the energetic preference of the surface for one of the polymer blocks. We have also observed, that confinement speeds up the process of long range ordering of the microdomains.

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Section: A Block Copolymer Thin Filmsmentioning

confidence: 99%

Section: A Block Copolymer Thin Filmsmentioning

confidence: 99%

See 1 more Smart Citation

Asymmetric block copolymers confined in a thin film

Huinink

Brokken-Zijp

Dijk

et al. 2000

The Journal of Chemical Physics

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185

318

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“…[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. Only when the preferential interaction with the surfaces is reduced, for example by coating a random copolymer brush on a surface, a perpendicular orientation may be achieved.…”

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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“…In such materials, the mechanical performance of the reinforced rubber is combined with the straightforward processing of thermoplastics due to the physical network of flexible chains. 39 Van Dijk and van den Berg 40 relatively thick (>30 nm) films from block copolymers were obtained by spin-coating and solvent casting and their microdomain structure was studied. 41,42 Grafted polymer brush layer…”

Section: Grafted Block Copolymer Layersmentioning

confidence: 99%

Design of nanocomposite polymer coatings for MEMS applications

Julthongpiput

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Ordering Phenomena in Thin Block Copolymer Films Studied Using Atomic Force Microscopy

Cited by 185 publications

References 3 publications

Asymmetric block copolymers confined in a thin film

Asymmetric block copolymers confined in a thin film

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

Design of nanocomposite polymer coatings for MEMS applications

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