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- W2021707949 abstract "The synthesis and characterization of a copolymer based on 4′-(6-acryloxy)hexyloxy-4-methoxyazobenzene (MAB6) and acrylic acid (AA) are reported. A reaction was carried out by free-radical polymerization, yielding an MAB6 homopolymer and an AA–MAB6 copolymer with an MAB6 concentration of 16–80%. A nematic phase was observed in the copolymer when the MAB6 content was 44% or higher. Both nematic and smectic phases were observed in the MAB6 homopolymer. All of the polymers were investigated for trans–cis–trans isomerization in a solid film. The samples were irradiated with nonpolarized ultraviolet light (385 nm) before absorption measurements were taken with an ultraviolet–visible spectrometer. The copolymer and homopolymer exhibited a thermal cis–trans isomerization, which could be described by a double-exponential relaxation process (fast and slow). The relaxation experiment suggested that the hydrogen bonding may have hindered the slow process but had no effect on the fast process. A film of a copolymer sample with a high MAB6 content could be optically aligned by the exposure of the sample to polarized light (385 nm). © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 4017–4024, 2003" @default.
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- W2021707949 date "2003-11-10" @default.
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- W2021707949 title "Preparation and photoinduced isomerization study of a homopolymer and a copolymer based on 4?-(6-acryloxy)hexyloxy-4-methoxyazobenzene and acrylic acid" @default.
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- W2021707949 doi "https://doi.org/10.1002/pola.10954" @default.
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