Molecular Engineering of Azobenzene-Functionalized Polyimides To Enhance Both Photomechanical Work and Motion

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• 作者：Jeong Jae Wie ; David H. Wang ; Kyung Min Lee ; Loon-Seng Tan ; Timothy J. White
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：September 23, 2014
• 年：2014
• 卷：26
• 期：18
• 页码：5223-5230
• 全文大小：490K
• ISSN：1520-5002

文摘

Photomechanical effects in polymeric materials directly convert input photonic energy into a macroscopic mechanical output. The photoinitiated mechanical output of these materials is typically dominated by classical mechanics, primarily derived from the material stiffness and sample geometry. Accordingly, large magnitude shape change (e.g., motion) is typically traded for large magnitude force generation. Here, we report on the systematic preparation and comparison of photomechanical effects in a set of isomerically varied linear and cross-linked azobenzene-functionalized materials that demonstrate the critical role of segmental mobility (evident in the magnitude of the 尾-transition) to assimilate the typically exclusive properties of large force generation and large shape change in a single material.