Soft Lithography on Block Copolymer Films: Generating Functionalized Patterns on Block Copolymer Films as a Basis to Further Surface Modification

Brehmer, Martin; Conrad, Lars S.; Funk, Lutz; Allard, Dirk; Théato, Patrick; Helfer, Anke

doi:10.1021/bk-2004-0874.ch010

Cited by 4 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Poly(styrene- block -4-(2-(2-(2-acetoxy)ethoxy)ethoxy)styrene) (PS- b -PAEES) and poly(4-(2-(2-(2-acetoxy)ethoxy)ethoxy)styrene) (PAEES) were synthesized by TEMPO-based controlled radical polymerization, and the reaction details have been published elsewhere . The polymers were characterized by NMR and gel permeation chromatography (GPC) as described previously . Polystyrene was commercially available (Aldrich) and used as received.…”

Section: Methodsmentioning

confidence: 99%

Surface Reorganization of an Amphiphilic Block Copolymer Film Studied by NEXAFS Spectroscopy

et al. 2006

Self Cite

View full text Add to dashboard Cite

The chemical composition of the surface of an amphiphilic diblock copolymer film, comprised of polystyrene and poly(4-(2-(2-(2-acetoxy)ethoxy)ethoxy)styrene), has been characterized upon equilibration in water and in a vacuum, employing surface sensitive near-edge X-ray absorption fine structure spectroscopy. The outermost surface layer exhibits a reversible exchange between the hydrophilic and hydrophobic polymer segments as the equilibrating interface is changed between water and vacuum, respectively. Surprisingly, time-dependent measurements show that a substantial partial molecular reorganization toward a vacuum-equilibrated surface occurs already at 60 °C, which is significantly below the glass transition temperature of the polystyrene block.

show abstract

Section: Methodsmentioning

confidence: 99%

Surface Reorganization of an Amphiphilic Block Copolymer Film Studied by NEXAFS Spectroscopy

et al. 2006

Self Cite

View full text Add to dashboard Cite

show abstract

“…The symmetric diblock copolymer polystryene‐ block ‐poly(4‐(2‐(2‐(2‐acetoxy)ethoxy)ethoxy)styrene) (PS‐ b ‐PAEES), shown in Figure (A), was synthesized by TEMPO‐based controlled radical polymerization . The number‐average molecular weight ( M n ) is 31,900 with a polydispersity of 1.17 and about equal volume fractions of the two blocks ( M n [PS] = 19,600 and M n [PAEES] = 12,300).…”

Section: Methodsmentioning

confidence: 99%

“…(A) Molecular structure of the amphiphilic block copolymer PS‐ b ‐PAEES . (B) Lamella ordering of the film leads to a smooth surface if the as‐deposited film thickness matches the height of the lamella stack.…”

Section: Methodsmentioning

confidence: 99%

Surface and bulk ordering in thin films of a symmetrical diblock copolymer

Vodungbo

Nilles

et al. 2013

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

Amphiphilic diblock copolymers have the ability to adapt their surface's molecular composition to the hydrophilicity of their environment. In the case of about equal volume fractions of the two polymer blocks, the bulk of these polymers is known to develop a laminar ordering. We report here our investigation of the relationship between bulk ordering and surface morphology/chemical composition in thin films of such an amphiphilic diblock copolymer. Upon annealing in vacuum, the expected lamella ordering in the bulk of the film is observed and we find the morphology of the film surface to be defined by the thickness of the as-deposited film: If the asdeposited thickness matches the height of a lamella stack, then the film exhibits a smooth surface. Otherwise, an incomplete lamella forms at the film surface. We show that the coverage of this incomplete layer can be quantified by X-ray reflectivity. To establish the lamella ordering in the bulk, the film needs to be annealed above the glass temperature of the two blocks. Molecular segregation at the film surface, however, is already occurring at temperatures well below the glass temperature of the two blocks. This indicates that below the glass temperature of the blocks the bulk of the thin film is "frozen," whereas the polymer chains composing the surface lamella have an increased mobility.

show abstract

RAFT Polymerization of Pentafluorophenyl Methacrylate: Preparation of Reactive Linear Diblock Copolymers

Eberhardt

Théato

2005

Macromol. Rapid Commun.

Self Cite

197

165

View full text Add to dashboard Cite

Summary: Reversible addition fragmentation chain transfer (RAFT) polymerization of pentafluorophenyl methacrylate (PFMA) was carried out in the presence of cumyldithiobenzoate and 4‐cyano‐4‐((thiobenzoyl)sulfanyl)pentanoic acid, respectively. These chain transfer agents with 2,2′‐azoisobutyronitrile (AIBN) as initiator yielded the active ester polymer poly(PFMA) with $\overline M _{\rm n}$ up to 17 000 g · mol−1 and low polydispersity index ($\overline M _{\rm w} /\overline M _{\rm n}$ < 1.2). Kinetic analysis using 19F NMR spectroscopy and gel permeation chromatography (GPC) measurements showed controlled polymerization behavior for both chain transfer agents. Successful preparation of linear diblock copolymers consisting of an active ester block and methyl methacrylate, N‐acryloylmorpholine, or N,N‐diethylacrylamide, respectively, could be demonstrated. These polymers could easily react with amines in a polymer analogous reaction to form multifunctional polymers. magnified image

show abstract

Soft Lithography on Block Copolymer Films: Generating Functionalized Patterns on Block Copolymer Films as a Basis to Further Surface Modification

Cited by 4 publications

References 0 publications

Surface Reorganization of an Amphiphilic Block Copolymer Film Studied by NEXAFS Spectroscopy

Surface Reorganization of an Amphiphilic Block Copolymer Film Studied by NEXAFS Spectroscopy

Surface and bulk ordering in thin films of a symmetrical diblock copolymer

RAFT Polymerization of Pentafluorophenyl Methacrylate: Preparation of Reactive Linear Diblock Copolymers

Contact Info

Product

Resources

About