Changes in the sol-gel transformation behavior of azobenzene moiety-containing methylcellulose irradiated with UV light
✍ Scribed by Kenichiro Arai; Yumi Kawabata
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 285 KB
- Volume
- 16
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Azobenzene moiety‐containing methylcellulose (AB‐MC) was prepared, the changes of the cloud point of its aqueous solutions as a thermotropic sol‐gel transformation behaviour were investigated under irradiation with UV light. AB‐MC's with degrees of substitution by the azobenzene moiety DS~AB~ > 2,5 · 10^‐2^ were insoluble in water. The azobenzene moiety in the AB‐MC was confirmed to be reversibly isomerized from the trans‐ to the cis‐form under irradiation with UV light of wavelengths 390 > λ > 310 nm and from the cis‐to the trans‐form under irradiation with visible light of λ > 400 nm. The cloud point value of the aqueous solution of AB‐MC increased under irradiation with UV light of 390 > λ > 310 nm for the AB‐MC's with a DS~AB~ value in a certain range and the extent of the increase in the cloud point value was higher at higher concentrations of AB‐MC.