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Published in: Cellulose 6/2023

04-03-2023 | Original Research

Effect of propionyl group on birefringence and wavelength dispersion of propionylated cellulose acetate optical compensation films

Authors: Xiaoyu Min, Xueqing Han, Tong Wu, Minfang An, Liangbin Li

Published in: Cellulose | Issue 6/2023

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Abstract

Propionylated cellulose acetate (PCA) with different propionyl substitution degrees (DSPr) was synthesized, and the corresponding optical films were prepared by solution casting. The birefringence and its wavelength dispersion of PCA films stretched at 10 °C above and below the glass transition temperature (Tg) with different draw ratios (DR) were studied. The introduction of propionyl group at different substitution sites present different contribution to birefringence and its wavelength dispersion. The propionyl group at C-2 and C-3 sites have a larger positive orientation birefringence with stronger normal wavelength dispersion, while that at the C-6 site shows a smaller negative orientation birefringence with weaker normal wavelength dispersion compared with the acetyl group. Compared with CA film, the introduction of the propionyl group weakens the orientation birefringence of PCA film. With the increase of DSPr from 0.023 to 0.303, the occurrence of propionyl substitution only at the C-6 site turns to C-2, C-3 and C-6 sites and the wavelength dispersion of in-plane birefringence (Δnin) decreases. When DSPr is further increased to 0.537, the Δnin and out-of-plane birefringence (Δnth) of PCA films at different DR show a very weak wavelength dispersion with the relative horizontal curves. Current results indicate that when the substitution degree of the propionyl group and acetyl group is suitable, the wavelength dispersion of PCA film can be eliminated.

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Appendix
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Metadata
Title
Effect of propionyl group on birefringence and wavelength dispersion of propionylated cellulose acetate optical compensation films
Authors
Xiaoyu Min
Xueqing Han
Tong Wu
Minfang An
Liangbin Li
Publication date
04-03-2023
Publisher
Springer Netherlands
Published in
Cellulose / Issue 6/2023
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-023-05112-z

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