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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/13504

Title: Extraordinary wavelength dispersion of birefringence in cellulose triacetate film with anisotropic nanopores
Authors: Nobukawa, Shogo
Shimada, Hikaru
Aoki, Yoshihiko
Miyagawa, Azusa
Doan, Vu Ahn
Yoshimura, Hiroshi
Tachikawa, Yutaka
Yamaguchi, Masayuki
Keywords: Nano-porous structure
Cellulose triacetate
Issue Date: 2014-05-22
Publisher: Elsevier
Magazine name: Polymer
Volume: 55
Number: 15
Start page: 3247
End page: 3253
DOI: 10.1016/j.polymer.2014.05.037
Abstract: We examined birefringence in a stretched film of cellulose triacetate (CTA) after extraction of an immiscible component. The CTA film plasticized by di(2-ethylhexyl) adipate (DOA), which was added as the immiscible additive, exhibited negative birefringence to the same degree as the pure CTA film. Following removal of DOA from the film by immersion into methanol, the birefringence of the blend film changed dramatically from negative to positive. Moreover, the wavelength dependence also changed from ordinary to extraordinary, in which the absolute value of birefringence increases with wavelength. Scanning electron microscope (SEM) images revealed nanoscale ellipsoidal pores in the film after the extraction, suggesting that DOA was segregated and formed ellipsoidal domains in the CTA matrix during annealing and stretching. According to an optical theory for the nanoporous structure, we found that the form birefringence contributes to control of the optical properties of the CTA film. This phenomenon could be utilized in the design of high-performance optical films, such as quarter waveplate, because sign and wavelength dispersion of birefringence can be controlled even for a single component film.
Rights: Copyright (C)2014, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license (CC BY-NC-ND 4.0). [http://creativecommons.org/licenses/by-nc-nd/4.0/] NOTICE: This is the author's version of a work accepted for publication by Elsevier. Shogo Nobukawa, Hikaru Shimada, Yoshihiko Aoki, Azusa Miyagawa, Vu Ahn Doan, Hiroshi Yoshimura, Yutaka Tachikawa, Masayuki Yamaguchi, Polymer, 55(15), 2014, 3247-3253, http://dx.doi.org/10.1016/j.polymer.2014.05.037
URI: http://hdl.handle.net/10119/13504
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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