Self-alignment and photomechanical properties of alternative multi-layered films containing azobenzene polymer liquid crystal and polyvinyl alcohol layers
Self-alignment and photomechanical properties of alternative multi-layered films containing azobenzene polymer liquid crystal and polyvinyl alcohol layers
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含偶氮苯聚合物液晶和聚乙烯醇层的替代多层薄膜的自对准和光机械性能
DOI：
10.1016/j.matlet.2013.09.085
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发表时间：
2013
影响因子：
3
通讯作者：
S. Kurihara
中科院分区：
文献类型：
--
作者：
Y. Kuwahara;M. Kaji;J. Okada;S-N. Kim;T. Ogata;S. Kurihara
我们展示了光机械材料的交替制造，包括偶氮苯侧链丙烯酸酯聚合物，PMAz 6Ac，和聚乙烯醇，PVA，没有交联。通过在玻璃基底上交替旋涂PVA和PMA_6Ac溶液的方法获得了多层（PMA_6Ac/PVA）n膜。热处理后，作为液晶基元的偶氮苯基团发生自组装，并诱导其发生面外取向。在UV照射（λ=375 nm）后，将通过剥离获得的自立膜弯曲到光源的相反侧，并且通过随后的可见光照射（λ>420 nm）使弯曲的膜恢复到初始位置。PMAz 6Ac薄膜的光学性质表明，PMAz 6Ac薄膜中偶氮基团的分子取向、离面取向和无序无序排列的变化与其光机械行为密切相关。
We demonstrated fabrication of photo-mechanical materials alternatively-including azobenzene-side-chained acrylate polymer, PMAz6Ac, and polyvinyl alcohol, PVA, without cross-linking. The multi-bilayered (PMAz6Ac/PVA)nfilms were obtained by alternative spin-coating methods of PVA and PMAz6Ac solutions on glass substrates. After thermal treatment, the azobenzene groups as mesogen were self-organized and were induced out-of-plane orientation. After UV irradiation (λ=375 nm), the self-standing films obtained by peeling off was bent to an opposite side of the light source, and the bended film reverted toward the initial position by following visible light irradiation (λ>420 nm). Their optical properties of the PMAz6Ac layers indicated that change of molecular orientation, out-of-plane orientation and disordered random, of azobenzene groups in the PMAz6Ac layers closely related with the photo-mechanical behaviors.