| Autor: |
Buruiana, Emil C, Buruiana, Tinca, Airinei, Anton, Robila, Gabriela, Grecu, Irinel |
| Zdroj: |
Polymer Journal; June 1999, Vol. 31 Issue: 6 p510-515, 6p |
| Abstrakt: |
New polyurethane cationomers bearing side chain azoaromatic chromophores on non-ionic fragment of hard segments were synthesized and characterized. Their photobehavior in solutions and polymeric films was investigated by electronic absorption spectroscopy and was evaluated comparatively with a non-ionic azourethane model and polyurethane precursor. Under UV irradiation only the polymer solutions showed a typical photochromism, while in film state, the reversible process was impeded even at higher temperatures. By exposure at iodine vapors for 1–2 min, the cis-trans isomerization in irradiated polymer films is possible too. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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