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Photo‐induced change in wettability and binding ability of azoaromatic polymers
Author(s) -
Ishihara Kazuhiko,
Okazaki Akihiko,
Negishi Naoki,
Shinohara Isao,
Okano Teruo,
Kataoka Kazunori,
Sakurai Yasuhisa
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070270125
Subject(s) - wetting , polymer , adsorption , contact angle , photochromism , irradiation , isomerization , materials science , chemical engineering , azobenzene , photochemistry , polymer chemistry , chemistry , organic chemistry , nanotechnology , catalysis , composite material , physics , nuclear physics , engineering
Photochromic polymers containing p ‐phenylazoacrylanilide were synthesized and the photo‐induced hydrophobicity change on the surface of the polymer film was studied by measuring water wettability. The wettability increased with UV irradiation and returned to the original value with visible light irradiation. This photo‐induced reversible change in wettability was considered to be caused by the large change of dipole moment across the azo bonds due to the isomerization of azo dye from trans to cis form. Furthermore, the photoresponsive polymeric adsorbent prepared from the azo polymer having adsorption behavior of a low molecular weight compound was studied. The binding ability of this polymeric adsorbent was decreased by UV irradiation. These results were attributed to the decreased hydrophobic interaction between the adsorbent and the adsorbate.