Operating methods for two‐way behavior shape memory polymer actuators without using external stress
Operating methods for two‐way behavior shape memory polymer actuators without using external stress
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DOI：
10.1002/tee.21940
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发表时间：
2014-01
影响因子：
1
通讯作者：
S. Imai
中科院分区：
文献类型：
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作者：
S. Imai
开发了双向行为形状记忆聚合物(SMP)致动器的操作方法并对其进行了表征。由于SMP的形状记忆效应是单向的，因此在传统的SMP致动器中也使用了使SMP变形的外力。我们提出了两种操作方法：双SMP层方法和单SMP层方法。双SMP层方法利用了两种不同玻璃化转变温度的SMP(Tg1和Tg2，Tg1<；Tg2)的形状记忆效应。在该方法中，在形成与Tg1相关的记忆形状之后，在TG2处，所生成的与Tg2相关的记忆形状取消先前的记忆形状，即，将TG2的记忆形状设置为与Tg1的记忆形状相反的形状。单层SMP方法利用了SMP在冷却过程中的形状记忆效应和热收缩效应。在该方法中，当SMP冷却到Tg以下时，通过SMP的热收缩将生成的Tg以上的记忆形状返回到预记忆形状。这些执行器选用了聚亚安酯系列的开关电源。我们通过使用悬臂梁的原型驱动器并检查它们的基本特性，证实了所提出的工作原理在实验中发挥了作用。这些操作方法只需要加热和冷却的温度循环，适用于微型机电系统(MEMS)等小型执行器。©2013日本电气工程师学会。作者：John Wiley&Sons，Inc.
Operating methods for two‐way behavior shape memory polymer (SMP) actuators have been developed and characterized. Since the shape memory effect of the SMP is one way, an external force to deform the SMP has also been used in conventional SMP actuators. We propose two operating methods: the double SMP layer method and the single SMP layer method. The double SMP layer method uses the shape memory effects of two kinds of SMPs with different glass transition temperatures (Tg1 and Tg2, Tg1 < Tg2). In this method, after a memory shape relating to Tg1 is formed, the generated memory shape relating to Tg2 cancels the previous memory shape at Tg2, i.e. the memory shape of Tg2 is set to the reverse shape of the memory shape of Tg1. The single SMP layer method uses the shape memory effect and thermal contraction of the SMP while it is cooling. In this method, a generated memory shape above Tg is returned to the pre‐memory shape by thermal shrinkage of the SMP when the SMP is cooled down below Tg. SMPs of the polyurethane series are chosen for these actuators. We confirmed that the proposed operating principles functioned experimentally by using prototype actuators of a cantilever beam and examining their fundamental characteristics. These operating methods need only a temperature cycle of heating and cooling and are suitable for small actuators such as microelectromechanical systems (MEMS). © 2013 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.