Self-Assembly of Poly(1,1-diethylsilabutane)-<i>b</i><i>lock</i>-poly(2-hydroxyethyl methacrylate) Block Copolymer. 2. Monolayer at the Air−Water Interface

Nakano, Minoru; Deguchi, Masaki; Endo, Hitoshi; Matsumoto, Kozo; Matsuoka, and Hideki; Yamaoka, H.

doi:10.1021/ma9819788

Cited by 19 publications

(20 citation statements)

References 32 publications

(55 reference statements)

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“…Recently, we have used poly(diethylsilacyclobutane) as a hydrophobic block in the amphiphilic polymer because it forms a very smooth and uniform hydrophobic monolayer on water. We have succeeded in observing very clear Kiessig fringes in XR profiles, with which we could perform a highly quantitative analysis 15, 16, 23. We have already reported an interesting relationship between the polymerization degree and its thickness in the monolayer 15.…”

Section: Introductionmentioning

confidence: 88%

“…We have been using a diblock copolymer spread monolayer for studying hydrophobic‐hydrophilic interactions as well as the polyelectrolyte brush structure 15, 16, 20–23. Recently, we have used poly(diethylsilacyclobutane) as a hydrophobic block in the amphiphilic polymer because it forms a very smooth and uniform hydrophobic monolayer on water.…”

Section: Introductionmentioning

confidence: 99%

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Carpetlike dense‐layer formation in a polyelectrolyte brush at the air/water interface

Mouri

Matsumoto

Matsuoka

2003

J Polym Sci B Polym Phys

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A carpetlike dense‐layer formation between a hydrophobic layer and a polyelectrolyte brush layer has been found in the monolayers of an ionic amphiphilic diblock copolymer, poly(1,1‐diethylsilacyclobutane)m‐block‐poly(methacrylic acid)n, on a water surface by an X‐ray reflectivity technique. By detailed analysis, we have found that the hydrophilic layer under the water is not a simple layer but is divided into two layers, that is, a carpetlike dense methacrylic acid (MAA) layer near the hydrophobic layer and a polyelectrolyte brush layer. We have also confirmed that a well‐established polyelectrolyte brush is formed only for the m:n = 43:81 polymer monolayer: For m:n = 40:10 and m:n = 45:60 polymer monolayers, only a dense MAA layer is formed. This dense‐layer formation should be the origin of the interesting hydrophobic‐layer thickness variation previously reported; The hydrophobic‐layer thickness takes a minimum as a function of the hydrophilic chain length at any surface pressure studied. An overview of the data for three samples with different chain lengths (m:n = 40:10, 45:60, or 43:81) has shown that the thickness of this dense layer is 10–20 Å and is independent of the surface pressure and polymerization degree of poly(methacrylic acid) (PMAA) in the range studied. This dense‐layer formation is explained by the reasonable speculation that contact with PMAA is thermodynamically more stable than direct contact with water for the diethylsilacyclobutane (Et2SB) layer on water. In this sense, the dense layer acts like a carpet for the hydrophobic Et2SB layer, and a 10–20‐Å thickness could be a critical value for the carpet. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 1921–1928, 2003

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Carpetlike dense‐layer formation in a polyelectrolyte brush at the air/water interface

Mouri

Matsumoto

Matsuoka

2003

J Polym Sci B Polym Phys

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“…Therefore, BrFL molecules exist within the area of 2.4 nm radius. Thus, we examine to analyze the SAXS profile of the M(BrFL) with a core-shell sphere model given by the following equation [30].…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution of hydrophobic compounds in polymer micelles as explored by anomalous small-angle X-ray scattering near Br K-edge

Nakanishi

Kinoshita

Sasaki

et al. 2016

European Polymer Journal

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“…The self-assembly of block copolymers in the bulk, 19 in solution, 20 and at interfaces 21 can be systematically tuned by choice of the blocks and their length. In the context of block copolymers for use at aqueous/LC interfaces, the structure of the LC-philic block can be used to dictate the strength and direction of director anchoring.…”

Section: Introductionmentioning

confidence: 99%

pH-responsive aqueous/LC interfaces using SGLCP-b-polyacrylic acid block copolymers

et al. 2010

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Block copolymers that combine a side-group liquid crystalline polymer (SGLCP) block and a pH-responsive hydrophilic block, poly(acrylic acid) (PAA), are shown to confer pH-dependent anchoring of the director orientation at the aqueous/LC interface. The SGLCP block, poly-(4-cyanobiphenyl-4-oxyundecylacrylate), was chosen based on its ability to influence the director field of the 5CB (4-cyano-4 0 -pentylbiphenyl). At low pH the PAA block collapses and the inherent, planar alignment tendency of 5CB at a water interface prevails. As pH increases, the polyelectrolyte block becomes increasingly charged and expands, producing a change to homeotropic anchoring. The change in anchoring occurs as quickly as the buffer can be changed (within $2 s) and is reversible, with a response that is repeatable over as many cycles as were tested (approximately 20 cycles). The polymer-mediated anchoring persists for 6 days, indicating that the SGLCP block secures the self-assembled layer on the 5CB, even under conditions that cause repulsive interactions among the PAA blocks. Thus, SGLCP blocks can translate conformational changes of a responsive hydrophilic block into rapid, reversible changes in the director field.

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Self-Assembly of Poly(1,1-diethylsilabutane)-block-poly(2-hydroxyethyl methacrylate) Block Copolymer. 2. Monolayer at the Air−Water Interface

Cited by 19 publications

References 32 publications

Carpetlike dense‐layer formation in a polyelectrolyte brush at the air/water interface

Carpetlike dense‐layer formation in a polyelectrolyte brush at the air/water interface

Spatial distribution of hydrophobic compounds in polymer micelles as explored by anomalous small-angle X-ray scattering near Br K-edge

pH-responsive aqueous/LC interfaces using SGLCP-b-polyacrylic acid block copolymers

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