From Angstroms to Micrometers: Self‐Organized Hierarchical Structure within a Polymer Film

Hayakawa, Teruaki; Horiuchi, Shin

doi:10.1002/anie.200219877

Cited by 148 publications

(134 citation statements)

References 21 publications

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“…Furthermore, various micro structures such as pincushion structures, 10 microsphere arrays 11 and so on were fabricated based on secondary processing of the honeycomb-patterned films. Wide variety of materials, including block copolymers, [12][13][14][15] star polymers, [16][17][18] dendrimers 19 can be used to prepare the honeycomb-patterned films. Amphiphilic copolymers (polyacrylamide, 20 polyion complex 21 ) are suitable polymers for preparation of the honeycomb-patterned films.…”

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confidence: 99%

The Effects of Interfacial Tensions of Amphiphilic Copolymers on Honeycomb-Patterned Films

et al. 2009

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A honeycomb-patterned film is formed by casting a polymer solution of polystyrene and amphiphilic copolymer under humid condition. Amphiphilic copolymers stabilize condensed water droplets as temporal templates. Therefore, physical properties of the amphiphilic copolymer are important factors for stability of condensed water droplets and the structure of the honeycomb-patterned film. In order to verify the effect of the interfacial tension between water and chloroform solution of the amphiphilic copolymer, which is one of the important physical properties, amphiphilic copolymers were synthesized from hydrophobic monomer and hydrophilic monomer at various copolymerization ratios. The interfacial tension decreased with increasing the copolymerization ratio of the hydrophilic comonomer. Uniformity of micropores of the honeycomb-patterned film increased with decreasing the value of the interfacial tension. Moreover, polymer frame of honeycomb-patterned film became thinner with decreasing the value of the interfacial tension. These results indicate that the structure of honeycombpatterned film can be controlled by the interfacial tension between water and polymer solution.

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The Effects of Interfacial Tensions of Amphiphilic Copolymers on Honeycomb-Patterned Films

et al. 2009

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“…20 We reported a semi-rod-coil type block copolymer, polystyreneb-polyisoprene with oligothiophene-modified side chains (PS-b-POTI) and the hierarchically structure within the film which prepared from the polymer solution by casting under a moist air flow. 21 Three tiers of the ordered empty micropores, the walls of which cony To whom correspondence should be addressed (Tel: +81-3-5734-2429, Fax: +81-3-5734-2875, E-mail: hayakawa@op.titech.ac.jp).…”

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Fabrication of Hierarchically Ordered Hybrid Structures over Multiple Length Scales via Direct Etching of Self-Organized Polyhedral Oligomeric Silsesquioxane (POSS) Functionalized Block Copolymer Films

Hayakawa

Seino

Goseki

et al. 2006

Polym J

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ABSTRACT:A novel fabrication of hierarchically ordered organic and inorganic hybrid structures at length scales ranging from nanometers to micrometers was demonstrated by oxygen plasma treatment of self-organized silicon-containing block copolymer films. The rod-coil type silicon-containing block copolymer, polystyrene-b-polyisoprene with polyhedral oligomeric silsesquioxane (POSS) -modified side chains, was successfully synthesized by hydrosilation of polystyrene-b-poly(1,2-ran-3,4-isoprene) block copolymer with hydrido-heptacyclopentyl substituted POSS. The films were prepared from the polymer solution by casting on silicon wafers under a moist air flow. The self-organized microstructures were investigated by electron microscopy. It was found that the hexagonally packed micropores and phaseseparated nanodomains were formed within the films. Oxygen plasma etching of the films provided novel hierarchically ordered hybrid structures.

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“…Resulting micropores were hexagonally packed with the narrow size distribution. It is believed that the formation of the microporus structure originates from the presence of condensed water droplets on the solvent evaporation [9][10][11][12][13]. The diameter of the open pores on the surface was dependent on the flow rate.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally it is recently observed that rod-coil block copolymers [9][10][11] as well as amphiphilic polymers [12,13] spontaneously form ordered microporous structures with a variety of length scale, when the polymer solutions are cast under humid conditions. In the case of a specially designed block copolymer, resulting porous films have highly ordered hierarchical structures over multiple length scales from angstroms to micrometers [11].…”

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confidence: 99%

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Synthesis and Characterization of Luminescent and Hole Transporting Rod-Coil Polymers

et al. 2004

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Luminescent cyano-substituted distyrylbenzene derivatives were synthesized via Knoevenagel condensation reactions. By using these compounds as initiators, a series of rod-coil polymers were synthesized by the atom transfer radical polymerization of methacrylate containing hole transporting carbazole moiety in high yields except the initiator with dicyanovinyl end groups. Molecular weight up to 37000 and polydispersity indices not exceeding 1.6 were obtained. Photoluminescent spectra revealed the aggregation of the rod parts in the solid state. The rod parts containing fluorinated alkyl groups were further aggregated by the heat treatment. The contact angle measurements suggested the fluoro alkyl groups dominated the film surface in the aggregation process. Microporous films with the open pore diameter of 1.1 or 3.7 µm were fabricated by casting the polymer solution under a moist air flow. Transmission spectrum showed the dip originated from the periodic arrangement of micropores.

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From Angstroms to Micrometers: Self‐Organized Hierarchical Structure within a Polymer Film

Cited by 148 publications

References 21 publications

The Effects of Interfacial Tensions of Amphiphilic Copolymers on Honeycomb-Patterned Films

The Effects of Interfacial Tensions of Amphiphilic Copolymers on Honeycomb-Patterned Films

Fabrication of Hierarchically Ordered Hybrid Structures over Multiple Length Scales via Direct Etching of Self-Organized Polyhedral Oligomeric Silsesquioxane (POSS) Functionalized Block Copolymer Films

Synthesis and Characterization of Luminescent and Hole Transporting Rod-Coil Polymers

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