Photomechanical Response of Glassy Azobenzene Polyimide Networks

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• 作者：David H. Wang ; Kyung Min Lee ; Zhenning Yu ; Hilmar Koerner ; Richard A. Vaia ; Timothy J. White ; Loon-Seng Tan
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：May 24, 2011
• 年：2011
• 卷：44
• 期：10
• 页码：3840-3846
• 全文大小：856K
• 年卷期：v.44,no.10(May 24, 2011)
• ISSN：1520-5835

文摘

We report the synthesis of amorphous, heat-resistant (T_g ranging from 220 to 246 掳C) polyimides cross-linked with a novel tris(azobenzeneamine) cross-linker and examine the photodirected bending of cantilevers composed of these materials to exposure to linearly polarized, 442 nm light. Increasing the cross-linker concentration from 5 to 20 mol % in the network not only serves to increase the T_g and modulus but also results in a considerable increase in photomechanical response observed as an increase in bending angle from 5掳 to 20掳. Adjustment of the orientation of the electric field of the light polarization to the cantilever axis is shown to generate forward and backward (bidirectional) bending. Upon removal of the incident light, the cantilevers exhibit photoelastic behavior by restoring to the original vertical position.