Spontaneous Perpendicular Orientation of Cylindrical Microdomains in a Block Copolymer Thick Film

Sakurai, Shinichi; Bando, Hiromichi; Yoshida, Hidekazu; Fukuoka, Ryoko; Mouri, Masahiro; Yamamoto, Katsuhiro; Okamoto, Shigeru

doi:10.1021/ma900155n

Cited by 43 publications

(46 citation statements)

References 23 publications

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“…Moreover, this concept can be applied to any type of block species universally. In our recent study, we have conducted experiments according to this tactics with using a cylinder-forming SEBS triblock copolymer (M n ¼ 6.6 Â 10 4 , M w / M n ¼ 1.03, total volume fraction of PS is 0.16, forming PS cylinders) [99]. Fig.…”

Section: Directional Fieldsmentioning

confidence: 99%

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Progress in control of microdomain orientation in block copolymers – Efficiencies of various external fields

Sakurai

2008

Polymer

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a b s t r a c tRecent progresses in control of orientation for block copolymer microdomains using external fields, such as force fields, electric fields, and magnetic fields will be reviewed. Since it has been more recognized that such explicit external fields are not necessarily required, implicit (unconscious) external fields, which mean those imposed automatically onto block copolymers, irrespective of intention, will also be covered under categories of ''surface fields'' and ''directional fields'', where self-organizing abilities of block copolymers are utilized for performance of spontaneous orientation (or in other words selforientation). Although some of these phenomena of the self-orientation have been already used in application-oriented researches towards nanotechnology, the mechanisms of self-orientation still remain ambiguous. Moreover, although there have been reported interesting and significant findings on the selforientation in the recent decades, it cannot be stated that the individual findings are well correlated with each other to draw formulated cognition. Therefore, in this feature article, we systematically discuss them under the new categories of the implicit external fields for a better understanding of phenomena and hopefully mechanisms of microdomain orientation.

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Section: Directional Fieldsmentioning

confidence: 99%

“…Adopted from Ref. [99]. directional coalescence of the spheres (forming embryonic short cylinders), such that they can nucleate spontaneous orientation of thus-formed PS cylinders parallel to n (namely perpendicular to the film sample).…”

Section: Directional Fieldsmentioning

confidence: 99%

Progress in control of microdomain orientation in block copolymers – Efficiencies of various external fields

Sakurai

2008

Polymer

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“…Moreover, this concept can be applied to any type of block species universally. We successfully applied this strategy to an SEBS (polystyrene‐ b ‐polyethylenebutylene‐ b ‐polystyrene) triblock copolymer …”

Section: Introductionmentioning

confidence: 99%

“…As a result, we have found spontaneous perpendicular orientation of PS (polystyrene) cylindrical microdomains in the matrix of PEB (polyethylenebutylene) of the SEBS triblock copolymer film with the thickness of about 0.5 mm . The sample was cast from a solution using a selective solvent, which was selectively good for PEB and poor for PS.…”

Section: Introductionmentioning

confidence: 99%

Depth Profiling of Block Copolymer Nanostructures in Films by Small‐Angle X‐Ray Scattering Using an X‐Ray Microbeam

Sakurai

Kimura²,

Mizuno³

et al. 2013

Macromolecular Symposia

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Summary We applied the microbeam two‐dimensional small‐angle X‐ray scattering (2d‐µSAXS) technique in order to characterize orientation of polystyrene (PS) microdomains as a function of the distance from the free surface of a sample sheet down to the surface facing to the substrate, for depth profiling for spontaneous perpendicular orientation of PS cylinders in the matrix of polyethylenebutylene (PEB) in a PS‐b‐PEB‐b‐PS triblock copolymer thick sheet as thick as ∼0.5 mm. It has been revealed that near the free surface the cylinders were randomly oriented down to ∼70 µm in depth. Although this might indicate that the surface effect, which preferentially dictates cylinders to be oriented parallel to the surface, can propagate for such a long distance, 70 µm is unusually huge as compared to the general knowledge of the surface effect propagating at most for 1 µm. Experimentally examining further, we finally conclude that the 2d‐µSAXS depth profiling overestimates the surface effect. This unfavorable conclusion may be ascribed to surface roughness of the sample sheet subjected to the measurement, and in order to obtain a good result a big effort is required to prepare the surface as flat as possible.

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“…Usually thin films with a thickness in the range of hundred to a few hundreds of nanometers are coated on a substrate and to take full advantage of the cylindrical structure the films should be treated to align the cylinders perpendicular to the substrate. Although several methods are available to achieve the perpendicular orientation, solvent evaporation‐assisted procedures appear to be the most promising 6, 23, 25–30. For instance, Stamm and co‐workers used solvent annealing/evaporation to achieve perpendicular channels in cylindrically self‐assembled PS‐ b ‐P4VP(HABA) 16–19.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Network Channels from Self‐Assembled Triblock Copolymer Supramolecules

Sart

Vuković²,

Vuković

et al. 2010

Macromol. Rapid Commun.

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Supramolecular complexes of a poly(tert-butoxystyrene)-block-polystyrene-block-poly(4-vinylpyridine) triblock copolymers and less than stoichiometric amounts of pentadecylphenol (PDP) are shown to self-assemble into a core-shell gyroid morphology with the core channels formed by the hydrogen-bonded P4VP(PDP)complexes. After structure formation, PDP was removed using a simple washing procedure, resulting in well-ordered nanoporous films that were used as templates for nickel plating.

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Spontaneous Perpendicular Orientation of Cylindrical Microdomains in a Block Copolymer Thick Film

Cited by 43 publications

References 23 publications

Progress in control of microdomain orientation in block copolymers – Efficiencies of various external fields

Progress in control of microdomain orientation in block copolymers – Efficiencies of various external fields

Depth Profiling of Block Copolymer Nanostructures in Films by Small‐Angle X‐Ray Scattering Using an X‐Ray Microbeam

Nanoporous Network Channels from Self‐Assembled Triblock Copolymer Supramolecules

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