High‐Density Liquid‐Crystalline Polymer Brushes Formed by Surface Segregation and Self‐Assembly

Mukai, K.; Hara, Mitsuo; Nagano, Shusaku; Seki, Takahiro

doi:10.1002/anie.201607786

Cited by 21 publications

(28 citation statements)

References 40 publications

(110 reference statements)

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“…The brighter skin layer and the darker underlayer are assigned to the PCNAz domain and PS domain, respectively, because the PS part with a higher phenyl group density is more strongly stained by RuO4 oxidants. [ 21a ] Thus, a PCNAz block chain monolayer forms at the film surface. Compared with the average unit numbers of the PCNAz block, the estimated extension of the PCNAz chain is 87% for the all‐trans‐zigzag conformation.…”

Section: Resultsmentioning

confidence: 99%

“…To attain such a structure, we adopt a surface segregation strategy using a diblock copolymer with an Az side‐chain liquid crystalline polymer (SCLCP). [ 21 ] We previously demonstrated that a spin‐cast film of polystyrene (PS) containing a small amount of a diblock copolymer of SCLCP connected with a PS block segregates the surface and forms a high‐density SCLCP brush via self‐assembly. [ 21 ] The PS block acts as a laterally mobile anchoring part to form a high‐density LC polymer brush on the PS film surface.…”

Section: Introductionmentioning

confidence: 99%

“…[ 21 ] We previously demonstrated that a spin‐cast film of polystyrene (PS) containing a small amount of a diblock copolymer of SCLCP connected with a PS block segregates the surface and forms a high‐density SCLCP brush via self‐assembly. [ 21 ] The PS block acts as a laterally mobile anchoring part to form a high‐density LC polymer brush on the PS film surface. This process should be applicable to the nonplanar geometry surface of the honeycomb wall.…”

Section: Introductionmentioning

confidence: 99%

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Photoswitchable Configuration of Nematic Liquid Crystal Droplets Embedded in a Honeycomb‐Patterned Film

Mukai

Hara

Yabu³

et al. 2021

Adv Materials Inter

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Honeycomb‐patterned polymer films prepared by the breath figure method exhibit unique shape features. These films have potential in various applications, but functional materials are rarely embedded into the arrayed cavity. Here, a photoswitchable function of a compartmented nematic liquid crystal (NLC) in a honeycomb array is proposed. Surface segregation and liquid crystal self‐assembly processes cover curved honeycomb walls of polystyrene (PS) with a high‐density polymer brush of an azobenzene side chain liquid crystalline polymer (SCLCP), producing honeycomb polymer films with isolated cavities. Spherical confinement of the cavities with the SCLC brush provides a bipolar nematic director (planar anchoring), whereas UV light irradiation induces a radial configuration (homeotropic anchoring) of NLC droplets. Photoisomerization of azobenzene UV and visible light irradiation repeatedly induces a photoswitchable change between the bipolar and radial modes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photoswitchable Configuration of Nematic Liquid Crystal Droplets Embedded in a Honeycomb‐Patterned Film

Mukai

Hara

Yabu³

et al. 2021

Adv Materials Inter

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“…The latter exhibits unique properties because of the stretched chain conformations, and dense LC polymer brushes can be prepared via e.g. surface segregation and self-assembly of diblock LC polymer molecules [48]. Another wide and technologically important class of LC polymer brushes are photo-sensitive brushes that contain chromophoric, e.g.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of decorated nanoparticles on a liquid crystalline polymer brush: molecular dynamics study

Slyusarchuk¹,

Yaremchuk²,

Ilnytskyi³

2020

Math. Model. Comput.

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We consider a solution of nanoparticles in a pore with one of its walls being a liquid crystalline polymer brush. Both nanoparticles' ligands and the brush molecules side chains contain the same liquid crystalline groups. The system is studied using the molecular dynamics simulations. At both cases of a low and high brush density, the aggregation between the pairs of nanoparticles in a bulk and between the brush molecules prevail. However, we found a specific brush density when the nanoparticles are adsorbed more readily on a brush than aggregate in a bulk. A set of density profiles as well as the dynamical properties of nanoparticles are analysed in all cases considered.

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“…The cornerstones of such occurrences in physical properties are the conformation , orientation , and arrangement of polymer chains. In the second half of the 1990s, the observation of one molecular chain was first achieved, in 3 days, owing to the formation of Langmuir–Blodgett (LB) films and the use of high‐resolution atomic force microscopy (AFM) technology .…”

Section: Introductionmentioning

confidence: 99%

Effect of the isothermal crystallization method on amorphous block copolymers of aromatic polyamides and their packing behavior in two‐dimensional films for screening of potential crystallization ability

Shidara

Yunoki

Miura

et al. 2017

Polymer Engineering & Sci

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The crystalline packing of polymers with high tendencies to form amorphous materials has been attained by controlling intermolecular interactions. Block copolymers of aromatic polyamides in which hydrogen‐bonding moieties are sparing and mostly substituted easily form amorphous materials because of steric hindrance and weak intermolecular affinities. Block copolymers of aromatic polyamides synthesized from 4‐(N‐methylamino)benzoic acid, terephthalic acid chloride, and poly(propylene glycol)bis(2‐aminopropyl ether) are commonly amorphous, regardless of unit length. Despite these copolymers not having distinct hydrophobic groups along the alkyl chain, aromatic rings in the same plane could be packed by π–π stacking by the method of two‐dimensional interfacial molecular films. The hard segment responsible for the c‐axis length increased the tilted angle depending on the chain length; as a result, the chain length was not dependent on the long spacing value. Actually, the layered period in organized films of aromatic polyamides did not depend on the segment length and always indicated a constant value. Isothermal crystallization was attempted for block copolymers of aromatic polyamides exhibiting potential packing ability by the method of organized molecular films. The analyzed glass transition temperature of the oligomer corresponding only to the block unit was adopted as the crystallization temperature. All amorphous polyamides used in this study crystallized after 24 h. A monoclinic packing structure and interactions between the few remaining hydrogen‐bonding moieties were suggested by a reciprocal lattice analysis. POLYM. ENG. SCI., 58:2019–2030, 2018. © 2017 Society of Plastics Engineers

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High‐Density Liquid‐Crystalline Polymer Brushes Formed by Surface Segregation and Self‐Assembly

Cited by 21 publications

References 40 publications

Photoswitchable Configuration of Nematic Liquid Crystal Droplets Embedded in a Honeycomb‐Patterned Film

Photoswitchable Configuration of Nematic Liquid Crystal Droplets Embedded in a Honeycomb‐Patterned Film

Adsorption of decorated nanoparticles on a liquid crystalline polymer brush: molecular dynamics study

Effect of the isothermal crystallization method on amorphous block copolymers of aromatic polyamides and their packing behavior in two‐dimensional films for screening of potential crystallization ability

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