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Polymers 2011, 3(2), 955-966;

Effect of Moisture on the Orientation Birefringence of Cellulose Esters

School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
Author to whom correspondence should be addressed.
Received: 22 April 2011 / Revised: 1 June 2011 / Accepted: 9 June 2011 / Published: 14 June 2011
(This article belongs to the Special Issue Polymers for Optical Applications)
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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. View Full-Text
Keywords: birefringence; cellulose ester; moisture content; optical film birefringence; cellulose ester; moisture content; optical film
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

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.

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