Effect of Cross-linking Density on Photoinduced Bending Behavior of Oriented Liquid-Crystalline Network Films Containing Azobenzene

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• 作者：Yanlei Yu ; Makoto Nakano ; Atsushi Shishido ; Takeshi Shiono ; and Tomiki Ikeda
• 刊名：Chemistry of Materials
• 出版年：2004
• 出版时间：May 4, 2004
• 年：2004
• 卷：16
• 期：9
• 页码：1637 - 1643
• 全文大小：192K
• 年卷期：v.16,no.9(May 4, 2004)
• ISSN：1520-5002

文摘

Oriented liquid-crystalline network films with various cross-linking densities were preparedby polymerization of mixtures of mono- and diacrylates, both of which contain azobenzenechromophores. The optical anisotropy in the films was evaluated by polarizing opticalmicroscopy and polarized IR spectroscopy. The dichroic ratios and the order parameters ofthe films were estimated from polarized UV absorbance. The free-standing films were foundto show photoinduced bending and unbending behavior upon alternate exposure tounpolarized UV light at 366 nm and unpolarized visible light at >540 nm. It was observedthat the films with different cross-linking densities exhibited different bending extents andspeeds.