On/off switching of structural color by using multi-bilayered films containing copolymers having azobenzene and biphenyl side groups
On/off switching of structural color by using multi-bilayered films containing copolymers having azobenzene and biphenyl side groups
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DOI：
10.1039/c5ra13110c
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发表时间：
2015-10
期刊：
影响因子：
3.9
通讯作者：
Ryohei Yagi;H. Iwamoto;Yutaka Kuwahara;Sunnam Kim;T. Ogata;S. Kurihara
中科院分区：
文献类型：
--
作者：
Ryohei Yagi;H. Iwamoto;Yutaka Kuwahara;Sunnam Kim;T. Ogata;S. Kurihara
本文研究了由偶氮苯和联苯侧链基团组成的共聚物 PMAz-PMBP (m:n) 和聚乙烯醇 (PVA) 交替堆叠而成的多层薄膜的结构颜色变化。研究发现，由具有偶氮苯侧链基团的聚丙烯酸酯和PVA组成的多层膜可以反射特定波长的光，并且通过热退火和非偏振紫外（UV）光照射，反射强度表现出可逆的变化。然而，多层膜反射强度的变化需要较长的照射时间。因此，我们合成了由偶氮苯和联苯侧链基团组成的PMAz-PMBP（m：n），在300 nm以上没有吸光度，并制备了PMAz-PMBP（m：n）/PVA多层薄膜。通过热退火和非偏振紫外光照射，所有多层薄膜都表现出反射强度的可逆变化。 PMAz–PMBP (75:25)/PVA 20 多层膜的再着色速度比本研究中制造的其他膜更快。它与光进入薄膜的穿透深度有关。将讨论在共聚物中引入联苯侧基对结构颜色变化的响应行为的影响。
In this paper, the change in structural color of multi-bilayered films fabricated by stacking copolymers, PMAz–PMBP (m : n), consisting of azobenzene and biphenyl side chain groups, and polyvinyl alcohol (PVA) alternately, was investigated. The multi-bilayered films consisting of polyacrylates having an azobenzene side chain group and PVA were found to reflect a light of specific wavelength, and to show reversible change in the reflection intensity by thermal annealing and irradiation with non-polarized ultra violet (UV) light. However, a long irradiation time was required for the change in reflection intensity of the multi-bilayered films. Therefore, we synthesized PMAz–PMBP (m : n), consisting of azobenzene and biphenyl side chain group having no absorbance over 300 nm, and the PMAz–PMBP (m : n)/PVA multi-bilayered films were fabricated. All the multi-bilayered films showed reversible change in the reflection intensity by thermal annealing and irradiation with non-polarized UV light. The re-coloration speed of PMAz–PMBP (75 : 25)/PVA 20-multibilayered film was faster than others fabricated in this study. It is related to penetration depth of light into the films. The effect of the introduction of the biphenyl side groups in the copolymers on the response behavior of the change in the structural color will be discussed.