Photoresponsive Surface Wrinkle Morphologies in Liquid Crystalline Polymer Films
Photoresponsive Surface Wrinkle Morphologies in Liquid Crystalline Polymer Films
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DOI：
10.1021/acs.macromol.5b01577
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发表时间：
2015-08
期刊：
影响因子：
5.5
通讯作者：
T. Takeshima;W. Liao;Yuki Nagashima;Koichi Beppu;Mitsuo Hara;Shusaku Nagano;T. Seki
中科院分区：
文献类型：
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作者：
T. Takeshima;W. Liao;Yuki Nagashima;Koichi Beppu;Mitsuo Hara;Shusaku Nagano;T. Seki
制备了含偶氮苯的液晶聚合物光响应性表层粘附在厚弹性体基底上的层压双层膜，并研究了单轴压缩时褶皱的形成。用365 nm的紫外光照射导致皱纹消失或皱纹波长减小，这取决于聚合物中偶氮苯单元的含量。皱纹形成的这种光响应调制可以很好地与使用AFM悬臂的压痕-回缩力曲线测量确定的杨氏模量的光致变化相关。此外，由光致质量迁移引起的皮肤层的厚度调制也可以应用于修改皱纹波长。这些光响应表面褶皱调制预期提供新的可能性，表面微细加工技术。
Laminated bilayer films comprised of photoresponsive azobenzene-containing liquid crystalline polymer skin layers adhered on a thick elastomeric substrate were prepared, and the wrinkle formation upon uniaxial compression was investigated. Irradiation with UV light at 365 nm led to the disappearance of the wrinkle or reduction of wrinkle wavelength, depending on the content of azobenzene unit in the polymer. Such photoresponsive modulations of wrinkle formation could be well correlated with the photoinduced changes in the Young’s modulus determined by indentation–retraction force curve measurements using an AFM cantilever. Additionally, the thickness modulation of the skin layer caused by the photoinduced mass migration can also be applied to modify the wrinkle wavelength. These photoresponsive surface wrinkle modulations are anticipated to offer new possibilities for the surface microfabrication technology.