Fabrication of photo responsive multi-bilayered film consisting of azobenzene containing copolymers and polyvinyl alcohol

Ryohei Yagi; Yutaka Kuwahara; Hiroyuki Iwamoto; Sun-Nam Kim; Tomonari Ogata; Seiji Kurihara

doi:10.1117/12.2038615

19 February 2014 Fabrication of photo responsive multi-bilayered film consisting of azobenzene containing copolymers and polyvinyl alcohol

Ryohei Yagi, Yutaka Kuwahara, Hiroyuki Iwamoto, Sun-Nam Kim, Tomonari Ogata, Seiji Kurihara

Author Affiliations +

Proceedings Volume 9004, Emerging Liquid Crystal Technologies IX; 90040O (2014) https://doi.org/10.1117/12.2038615
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

In this study, faster response speed of ON/OFF switching of multi-bilayered films containing azo-functionalized polymer liquid crystal and polyvinyl alcohol, PVA, is investigated. The multi-bilayered films were found to reflect a light of specific wavelength, and showed reversible change in the reflection intensity by irradiation with non-polarized visible light and UV light. The multi-bilayered film having high absorbance around 300-500 nm due to stacking several decades of azobenzene containing layer. So, the change in reflection intensity of multi-bilayered film takes long time by light irradiation. We synthesized polyacrylates copolymers with azobenzene and biphenyl side chains where biphenyl groups is having no absorbance at UV and visible region. Multi-bilayered films were fabricated by spin-coating method and the switching time of reflection was investigated comparing to the multi-bilayered film containing azobenzene homopolymer, the ON switching times of reflection for the copolymers were faster than homopolymer needing 900 s. It is attributed to that inducing UV light (λ = 365 nm) easily entered into the film by introducing of biphenyl groups.

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Ryohei Yagi, Yutaka Kuwahara, Hiroyuki Iwamoto, Sun-Nam Kim, Tomonari Ogata, and Seiji Kurihara "Fabrication of photo responsive multi-bilayered film consisting of azobenzene containing copolymers and polyvinyl alcohol", Proc. SPIE 9004, Emerging Liquid Crystal Technologies IX, 90040O (19 February 2014); https://doi.org/10.1117/12.2038615

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KEYWORDS

Reflection

Ultraviolet radiation

Switching

Refractive index

Visible radiation

Reflectivity

Absorbance

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