Switching surface polarity: synthesis and characterization of a fluorinated block copolymer with surface‐active
            <i>tert</i>
            ‐butoxycarbonyl groups

Hayakawa, Teruaki; Wang, Jianguo; Sundararajan, Narayan; Xiang, Meng; Li, Xuefa; Gl�sen, Birgit; Leung, Garlen C.; Ueda, Mitsuru; Ober, Christopher K.

doi:10.1002/1099-1395(200012)13:12<787::aid-poc326>3.0.co;2-#

Cited by 14 publications

(8 citation statements)

References 22 publications

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“…It is known that this coil-coil type block copolymer can be easily converted to a series of rod-coil type block copolymers by incorporation of a variety of rigid-rod molecules into the side chains. [25][26][27][28][29] The synthesis of polystyrene-bpolyisoprene with the POSS-modified side chains (PS-b-PIPOSS) as a silicon-containing rod-coil type block copolymer was carried out by hydrosilation of polystyrene-b-poly(1,2-ran-3,4-isoprene) with the hydrido-heptacyclopentyl substituted POSS in the presence of a catalytic amount of Pt(dvs) in toluene at …”

Section: Synthesis Of Silicon-containing Rod-coil Type Block Copolymermentioning

confidence: 99%

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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Section: Synthesis Of Silicon-containing Rod-coil Type Block Copolymermentioning

confidence: 99%

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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“…Hayakawa et al41 synthesized block copolymers with removable protecting groups attached to the semifluorinated side chains. Figure 6 shows the side group attached to the polyisoprene block of a hydroxylated poly(styrene‐ b ‐isoprene) block copolymer.…”

Section: Applicationsmentioning

confidence: 99%

Flow cytometry detection of Shiga toxins in the blood from children with hemolytic uremic syndrome

Tazzari¹,

Ricci²,

Carnicelli³

et al. 2004

Cytometry Part B Clinical

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Results: The method was quick (3 h), sensitive (femtomoles), and capable of detecting both Stxs. The presence of Stxs was detected on PMNs from six patients with HUS: four patients had serologic or microbiological evidence of STEC infection, whereas the other two patients had no evidence of STEC infection when employing the standard diagnostic methods. Conclusions: The method described is rapid, simple, and based on commercially available reagents, and it might be more sensitive than the standard methods for diagnosis of STEC infection. It also allows the detection of Stxs in blood, a key step to monitor the pathogenesis of HUS.

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“…Surfaces of block copolymers are of significant scientific and technological interest due to the tunability of their properties, which is critically important for the manifold applications of block copolymers such as adhesives, membranes, composite materials, biomaterials, and drug delivery systems, to name a few. − Consequently, block copolymer surfaces have been intensively studied with a wide spectrum of experimental techniques including contact angle measurements, , X-ray photoelectron spectroscopy (XPS), , attenuated total reflectance Fourier transform infrared spectroscopy (ATR−FTIR), , static secondary-ion mass spectrometry (static-SIMS), high-resolution electron energy loss spectroscopy (HREELS), transmission electron microscopy (TEM), , and X-ray absorption spectroscopy. , All these studies confirm the intuitive picture that under dry conditions the more hydrophobic segments with a lower surface energy are enriched in the outermost surface region of the block copolymer films. When the surface is exposed to water, a reorganization of the molecular groups at the surface occurs to reduce the free energy of the new water−polymer interface by placing the more hydrophilic polymer segments in contact with water.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2006

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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.

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Switching surface polarity: synthesis and characterization of a fluorinated block copolymer with surface‐active tert ‐butoxycarbonyl groups

Cited by 14 publications

References 22 publications

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

Flow cytometry detection of Shiga toxins in the blood from children with hemolytic uremic syndrome

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

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