Azo Block Copolymers in the Solid State

Yu, Haifeng; Ikeda, Tomiki

doi:10.1002/9780470439098.ch12

Cited by 2 publications

(1 citation statement)

References 97 publications

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“…This review focuses on photo-responsive block copolymers and nanostructured materials generated thereof via self-assembly in selective solvents, whereby most examples report on processes in aqueous media using amphiphilic block copolymers. For bulk applications, the reader is referred to a recent review by Gohy and Bertrand dealing with photo-responsive surfaces, thin films, and gels/hydrogels [ 8 ] and an earlier book chapter discussing specifically azo-functionalized block copolymers in the solid state [ 9 ]. During this review, we have subdivided the specific examples: (1) according to the wavelength at which the irradiation has to be carried out; and (2) according to whether irradiation with light of a suitable wavelength leads to reversible or irreversible changes in material properties.…”

Section: Introduction and Scopementioning

confidence: 99%

Micellization of Photo-Responsive Block Copolymers

2017

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This review focuses on block copolymers featuring different photo-responsive building blocks and self-assembly of such materials in different selective solvents. We have subdivided the specific examples we selected: (1) according to the wavelength at which the irradiation has to be carried out to achieve photo-response; and (2) according to whether irradiation with light of a suitable wavelength leads to reversible or irreversible changes in material properties (e.g., solubility, charge, or polarity). Exemplarily, an irreversible change could be the photo-cleavage of a nitrobenzyl, pyrenyl or coumarinyl ester, whereas the photo-mediated transition between spiropyran and merocyanin form as well as the isomerization of azobenzenes would represent reversible response to light. The examples presented cover applications including drug delivery (controllable release rates), controlled aggregation/disaggregation, sensing, and the preparation of photochromic hybrid materials.

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Section: Introduction and Scopementioning

confidence: 99%

Micellization of Photo-Responsive Block Copolymers

2017

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Fabrication of Regularly Patterned Microporous Films by Self‐Organization of an Amphiphilic Liquid‐Crystalline Diblock Copolymer in a Dry Environment

Chen

Liu

Kobayashi

et al. 2010

Macro Materials & Eng

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An amphiphilic LCBC PEO‐b‐PAz consisting of flexible PEO as a hydrophilic block and poly(methacrylic acid) containing an azobenzene moiety in side chain as a hydrophobic LC segment was synthesized and used to fabricated microporous films by spin‐coating method under a dry environment. With the help of a small amount of water, well‐arranged ellipsoidal micropores embedded in a LC matrix were obtained and the pore size is in the range of several tens µm of water. The influence of water content and rotational speed was studied in detail. It was found that regularly patterned microporous films can be prepared with certain water content, and the pore size can be easily tailored through changing the rotational speed. The obtained microporous structures showed good thermal and photo stability.

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Azo Block Copolymers in the Solid State

Cited by 2 publications

References 97 publications

Micellization of Photo-Responsive Block Copolymers

Micellization of Photo-Responsive Block Copolymers

Fabrication of Regularly Patterned Microporous Films by Self‐Organization of an Amphiphilic Liquid‐Crystalline Diblock Copolymer in a Dry Environment

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