Relaxation Dynamics and Strain Persistency of Azobenzene‐Functionalized Polymers and Actuators
Relaxation Dynamics and Strain Persistency of Azobenzene‐Functionalized Polymers and Actuators
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DOI：
10.1002/mame.201700256
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发表时间：
2017-12
影响因子：
3.9
通讯作者：
A. Skandani;S. Chatterjee;David H. Wang;Loon-Seng Tan;T. White;M. Shankar;Matthew L. Smith
中科院分区：
文献类型：
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作者：
A. Skandani;S. Chatterjee;David H. Wang;Loon-Seng Tan;T. White;M. Shankar;Matthew L. Smith
近年来，偶氮苯功能化聚合物中光致变形的积累受到了大量的关注。关键的是，在这些系统中诱导的光力学变形经历了不同程度的松弛。控制光力学应变的持久性对于这些材料在形状可编程系统（包括软机器人和工程折纸）中的广泛应用至关重要。此外，紫外光引发的光响应聚合物体系的弛豫研究比蓝绿光引发的弛豫研究更为突出。本研究考察了链迁移率和初始诱导光应变对偶氮苯功能化聚酰亚胺在蓝光照射后弛豫动力学的影响。为了进一步探讨材料结构、弛豫动力学和宏观变形之间的关系，开展了将发色团种群动力学与材料应变耦合的建模工作。通过模拟一个光激发双稳致动器的例子，强调了控制应变持久性的意义。
The accumulation of photoinduced deformation in azobenzene functionalized polymers has received a significant amount of attention in recent years. Critically, the induced photomechanical deformation in these systems experiences varying degrees of relaxation. Control over the persistence of photomechanical strains is vital to the broader utility of these materials in shape programmable systems including soft robotics and engineered origami. Furthermore, investigations of relaxation in light responsive polymer systems triggered by UV light are more prominent than those triggered by blue-green light. In this study, the impact of chain mobility and initially induced photostrain on the relaxation dynamics of azobenzene-functionalized polyimides after irradiation with blue light is examined. A modeling effort coupling chromophore population dynamics to material strain is carried out to further explore the relationship between material structure, relaxation dynamics, and macroscopic deformation. The implications for controlling strain persistence are highlighted by simulating one example of a photoprimed bistable actuator.