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このアイテムの引用には次の識別子を使用してください:
http://hdl.handle.net/10119/9838
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| タイトル: | Effect of Moisture on the Orientation Birefringence of Cellulose Esters |
| 著者: | Manaf, Mohd Edeerozey Abd
Tsuji, Manami
Nobukawa, Shogo
Yamaguchi, Masayuki |
| キーワード: | birefringence
cellulose ester
moisture content
optical film |
| 発行日: | 2011-06-14 |
| 出版者: | MDPI Publishing |
| 誌名: | Polymers |
| 巻: | 3 |
| 号: | 2 |
| 開始ページ: | 955 |
| 終了ページ: | 966 |
| DOI: | 10.3390/polym3020955 |
| 抄録: | Orientation birefringence and its wavelength dispersion are studied for hot-drawn films of cellulose esters such as cellulose triacetate (CTA), cellulose diacetate (CDA), and cellulose acetate propionate (CAP) exposed to three different humidities of environments. Hot-drawn CTA films show negative birefringence that decreases with increasing wavelength. On the other hand, CDA and CAP films show positive birefringence that increases with increasing wavelength, i.e., the so-called extraordinary wavelength dispersion of birefringence. Upon exposure to high humidity environment, the orientation birefringence of CDA and CAP decreases. The decrease is prominent for the samples containing a large amount of water. CTA, however, shows an increase in magnitude of its negative orientation birefringence with increasing moisture content. The results can be explained by the increase of the polarizability anisotropy perpendicular to the stretching direction in the cellulose esters. It is found from ATR-FTIR measurements that hydrogen bonds are formed between carbonyl groups of cellulose esters and water molecules. Considering that orientation birefringence of cellulose esters is determined mainly by ester groups, the formation of hydrogen bonds contributes to the polarizability anisotropy, thus affecting the orientation birefringence. |
| Rights: | © 2011 by the authors; licensee MDPI, Basel, Switzerland. Manaf, M.E.A.; Tsuji, M.; Nobukawa, S.; Yamaguchi, M. Effect of Moisture on the Orientation Birefringence of Cellulose Esters. Polymers 2011, 3, 955-966. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/). |
| URI: | http://hdl.handle.net/10119/9838 |
| 資料タイプ: | publisher |
| 出現コレクション: | c10-1. 雑誌掲載論文 (Journal Articles)
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