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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/15743

Title: Birefringence and strain-induced crystallization of stretched cellulose acetate propionate films
Authors: Nobukawa, Shogo
Nakao, Akichika
Songsurang, Kultida
Pulkerd, Panitha
Shimada, Hikaru
Kondo, Misaki
Yamaguchi, Masayuki
Keywords: birefringence
wavelength dependence
strain-induced crystallization
Issue Date: 2017-01-16
Publisher: Elsevier
Magazine name: Polymer
Volume: 111
Start page: 53
End page: 60
DOI: 10.1016/j.polymer.2017.01.027
Abstract: We investigated wavelength dependence of birefringence (Δn) for cellulose acetate propionate (CAP) films stretched at various draw ratios (DRs) and strain rates (SRs), by comparing the result of cellulose triacetate (CTA). CAP exhibited an extraordinary wavelength dispersion of Δn although CTA showed an ordinary dispersion, indicating that Δn of CAP is determined by acetyl and propionyl groups. The extraordinary dispersion for CAP became stronger at larger DR and higher SR. The thermal analysis data suggested that the hot-stretching induces the crystallization of CAP and the crystal size increases with increasing DR and SR. Furthermore, two-dimensional X-ray diffraction pattern of CAP exhibited the orientation of the induced crystal as well as that of CTA, which is one of semi-crystalline polymers. These results mean that the acetyl orientation in CAP becomes stronger than the propionyl orientation. This conclusion is reasonable because acetyl group is more tightly confined to a pyranose ring than propionyl.
Rights: Copyright (C)2017, 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, Akichika Nakao, Kultida Songsurang, Panitha Pulkerd, Hikaru Shimada, Misaki Kondo, Masayuki Yamaguchi, Polymer, 111, 2017, 53-60, http://dx.doi.org/10.1016/j.polymer.2017.01.027
URI: http://hdl.handle.net/10119/15743
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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