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Photo-controlled fabrication of honeycomb-patterned films in poly(N-vinylcarbazole/azobenzene) copolymer

Paper ID Volume ID Publish Year Pages File Format Full-Text
26810 43980 2013 12 PDF Available
Title
Photo-controlled fabrication of honeycomb-patterned films in poly(N-vinylcarbazole/azobenzene) copolymer
Abstract

•Highly ordered honeycomb-patterned polymer films were obtained by the help of UV illumination.•A new type of copolymer comprising N-vinylcarbazole and azobenzene monomer was synthesized.•The effect of UV illumination is interpreted by the photo-switched isomerization of the azobenzene component.•Photo-switched isomerization from trans to cis-form increased the dipole moment of the copolymer.

We have obtained a highly ordered honeycomb-patterned porous film by the assistance of UV illumination on the fabrication of polymer solution by the breath figure process under humid conditions. For the photo-controlled fabrication, a new type of UV-sensitive polymer that comprises N-vinylcarbazole and azobenzene monomer, poly(N-vinycarbazole/4-[N′-(2-cyano-4-nitrophenyl)azo]-2,6-dimethylphenol methacrylate, was synthesized and fabricated without addition of an amphiphilic copolymer necessary to hold water droplets on the hydrophobic solution surface as an air-water interface stabilizer. Highly well-ordered regular structure of honeycomb-patterned films was obtained by the illumination of UV light during the fabrication. The effect of UV illumination on the fabrication of the polymer film can be interpreted by the photo-switched isomerization of the azobenzene component in the copolymer from trans- to cis-isomer, which increases the hydrophilicity of the polymer solution inducing the decrease of interfacial tension of the polymer solution for the formation of uniform honeycomb pattern.

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Keywords
Photo-control; Honeycomb-pattern; Azobenzene copolymer; Interfacial tension
First Page Preview
Photo-controlled fabrication of honeycomb-patterned films in poly(N-vinylcarbazole/azobenzene) copolymer
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 272, 15 November 2013, Pages 6–17
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering