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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/16121

Title: Effect of acetyl substitution on the optical anisotropy of cellulose acetate films
Authors: Hatamoto, Kazuya
Shimada, Hikaru
Kondo, Misaki
Nobukawa, Shogo
Yamaguchi, Masayuki
Keywords: Cellulose acetate
Birefringence
Orientation
Refractive index
Issue Date: 2018-06-09
Publisher: Springer Nature
Magazine name: Cellulose
Volume: 25
Number: 8
Start page: 4453
End page: 4462
DOI: 10.1007/s10570-018-1890-4
Abstract: The effect of acetyl substitution on the optical properties of cellulose acetate (CA) was investigated in the present study. During hot-stretching, the absolute orientation birefringence increased with tensile stress. The stretched films with high acetyl substitution had negative orientation birefringence, whereas those with low acetyl substitution had positive orientation birefringence. Furthermore, there was a great reduction in the rate of decrease in orientation birefringence following the cessation of hot-stretching. The slow relaxation of crystal orientation was responsible for the anomalous optical anisotropy, as confirmed by two-dimensional X-ray diffraction. Moreover, the slow relaxation of orientation birefringence would greatly benefit the preparation of CA optical retardation films by hot-stretching, because it would simplify the precise control of retardation. The stress-optical coefficient in the glassy state was also evaluated, and was found to decrease with the degree of acetyl substitution.
Rights: This is the author-created version of Springer Nature, Kazuya Hatamoto, Hikaru Shimada, Misaki Kondo, Shogo Nobukawa, Masayuki Yamaguchi, Cellulose, 25(8), 2018, 4453-4462. The original publication is available at www.springerlink.com, http://dx.doi.org/10.1007/s10570-018-1890-4
URI: http://hdl.handle.net/10119/16121
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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