NDLI: Optical anisotropy in solution-cast film of cellulose triacetate

Content Provider	Springer Nature Link
Author	Songsurang, Kultida Miyagawa, Azusa Manaf, Mohd Edeerozey Abd Phulkerd, Panitha bukawa, Shogo Yamaguchi, Masayuki
Copyright Year	2012
Abstract	The out-of-plane birefringence and its wavelength dispersion are studied employing solution-cast films of cellulose triacetate (CTA). In solution-cast process, CTA molecules are induced to align in the film plane. Although refractive index is the lowest in the oriented direction for the CTA films stretched more than 110 %, refractive index is found to be the lowest in the normal direction for the unstretched cast film. Attenuated total reflection measurements reveal that in-plane alignment of the acetyl group which provides strong polarizability anisotropy is responsible for the phenomenon. Furthermore, the out-of-plane birefringence is found to increase with increasing wavelength, i.e. extraordinary wavelength dispersion, whereas a stretched CTA film shows ordinary wavelength dispersion. The level of the out-of-plane birefringence in cast films depends on the preparation conditions, which is predictable considering the evaporation rate. Moreover, it is demonstrated for the first time that the out-of-plane birefringence and its wavelength dispersion can be modified by addition of a certain plasticizer such as tricresyl phosphate (TCP). During the evaporation, TCP molecules orient in the film plane accompanying the orientation of CTA chains by intermolecular orientation correlation, called nematic interaction. This technique will widen the scope of material design of retardation films because there are numerous liquid compounds having strong polarizability anisotropy.
Starting Page	83
Ending Page	96
Page Count	14
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	20
Issue Number	1
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-02-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cellulose triacetate Out-of-plane birefringence Solution-cast Bioorganic Chemistry Physical Chemistry Organic Chemistry Polymer Sciences Ceramics, Glass, Composites, Natural Materials Sustainable Development
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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