材料科学
变形(气象学)
复合材料
聚合物
湿度
模数
热力学
物理
作者
Qiwen Yan,Lina Mao,Bang Feng,Lidong Zhang,Yimin Wu,Wei Huang
标识
DOI:10.1021/acsami.0c22023
摘要
A series of novel humidity-responsive and photosensitive polymer films (PCA–PAA–PEG) are prepared. These films can be patterning cross-linked by the photodimerization of coumarin pendant groups. The humidity-induced deformation can be well controlled by the pattern because of the different modulus and hydrophilicity between cross-linked and un-cross-linked segments. In addition, the pattern can be erased and the deformation direction can be changed programmatically by the de-cross-linking–re-cross-linking approach due to the reversible photodimerization of coumarin groups. The cross-linking degree also affects the humidity responsiveness of the film. The deformation of the gradient patterning cross-linked film can be more accurately controlled. Moreover, the length and width ratio (L/Ws/Wh) of the un-cross-linked segment to the cross-linked segment affects the deformation of the films as well. When L/Ws/Wh is 5/2/1 or 5/3/1, the deformation is controllable, and when L/Ws/Wh is 5/1/1 or 5/4/1, the deformation is random at the initial stage, but the whole film will bend along the short axis in the end.
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