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Changes in the sol‐gel transformation behavior of azobenzene moiety‐containing methylcellulose irradiated with UV light
Author(s) -
Arai Kenichiro,
Kawabata Yumi
Publication year - 1995
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1995.030161201
Subject(s) - azobenzene , moiety , irradiation , aqueous solution , photochemistry , chemistry , thermotropic crystal , visible spectrum , materials science , polymer chemistry , stereochemistry , polymer , organic chemistry , physics , optoelectronics , nuclear physics , liquid crystalline
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.