Photocontrolled microphase separation in a nematic liquid-crystalline diblock copolymer
Identifieur interne : 000B95 ( Main/Curation ); précédent : 000B94; suivant : 000B96Photocontrolled microphase separation in a nematic liquid-crystalline diblock copolymer
Auteurs : HAIFENG YU [Japon] ; Takaomi Kobayashi [Japon] ; Guo-Hua Hu [France]Source :
- Polymer : (Guildford) [ 0032-3861 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Polymère amphiphile, Ethylène oxyde copolymère, Copolymère biséquencé, Méthacrylate copolymère, Copolymère photosensible, Polymère cristal liquide, Etat thermotrope, Chaîne latérale, Composé azoïque, Préparation, Polymérisation transfert atome, Transition phase, Couche mince, Structure domaine, Nanostructure, Alignement, Effet photoinduit, Rayonnement polarisé, Etude expérimentale, Orientation microdomaine, Effet thermoinduit.
English descriptors
- KwdEn :
- Alignment, Amphiphilic polymer, Atom transfer polymerization, Azo compound, Diblock copolymer, Domain structure, Ethylene oxide copolymer, Experimental study, Light sensitive copolymer, Liquid crystal polymers, Methacrylate copolymer, Nanostructure, Phase transitions, Photoinduced effect, Polarized radiation, Preparation, Side chain, Thermotropic state, Thin film.
Abstract
Using a bromo-terminated poly(ethylene oxide) as a macroinitiator, an amphiphilic liquid-crystalline (LC) diblock copolymer with an azobenzene moiety as a nematic mesogen was prepared by an atom transfer radical polymerization process. In thin films of the well-defined diblock copolymer with the mesogenic block as a continuous phase upon microphase separation, the influence of supramolecular cooperative motion on the microphase-separated nanocylinders was systematically studied. Although the major phase of the hydrophobic nematic LC block showed only one-dimensional order, it could endow the separated minor phase of the hydrophilic PEO nanocylinders with three-dimensionally ordered structures. Both out-of-plane perpendicular and in-plane parallel patternings of the regularly ordered nanocylinder arrays were successfully fabricated on macroscopic scales by thermal annealing and photoalignment, respectively. The microphase-separated nanostructures with high regularity showed excellent reproducibility and mass production, which might guarantee nanotemplated fabrication processes and would lead to novel industrial applications in macromolecular engineering.
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liquide</term><term>Etat thermotrope</term><term>Chaîne latérale</term><term>Composé azoïque</term><term>Préparation</term><term>Polymérisation transfert atome</term><term>Transition phase</term><term>Couche mince</term><term>Structure domaine</term><term>Nanostructure</term><term>Alignement</term><term>Effet photoinduit</term><term>Rayonnement polarisé</term><term>Etude expérimentale</term><term>Orientation microdomaine</term><term>Effet thermoinduit</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Using a bromo-terminated poly(ethylene oxide) as a macroinitiator, an amphiphilic liquid-crystalline (LC) diblock copolymer with an azobenzene moiety as a nematic mesogen was prepared by an atom transfer radical polymerization process. In thin films of the well-defined diblock copolymer with the mesogenic block as a continuous phase upon microphase separation, the influence of supramolecular cooperative motion on the microphase-separated nanocylinders was systematically studied. Although the major phase of the hydrophobic nematic LC block showed only one-dimensional order, it could endow the separated minor phase of the hydrophilic PEO nanocylinders with three-dimensionally ordered structures. Both out-of-plane perpendicular and in-plane parallel patternings of the regularly ordered nanocylinder arrays were successfully fabricated on macroscopic scales by thermal annealing and photoalignment, respectively. The microphase-separated nanostructures with high regularity showed excellent reproducibility and mass production, which might guarantee nanotemplated fabrication processes and would lead to novel industrial applications in macromolecular engineering.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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