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Title
Japanese: 
English:Highly birefringent polymer films from the photo-crosslinking polymerisation of bistolane-based methacrylate monomers 
Author
Japanese: 荒川 優樹, 桑原 浩樹, 坂尻 浩一, 姜 聲敏, 戸木田 雅俊, 小西 玄一.  
English: Yuki Arakawa, Hiroki Kuwahara, Koichi Sakajiri, Subgmin Kang, Masatoshi Tokita, Gen-ichi Konishi.  
Language English 
Journal/Book name
Japanese: 
English:Liq. Cryst. 
Volume, Number, Page Vol. 42        pp. 1419-1427
Published date June 30, 2015 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
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DOI https://doi.org/10.1080/02678292.2015.1053542
Abstract The photo-polymerisation of mixtures of mono- and dimethacrylates, containing a bistolane moiety with a central fluorine-substituted benzene ring, resulted in the formation of highly birefringent polymer films (Δn = 0.40), which were obtained in a nematic liquid crystal (NLC) phase. While the dimethacrylate forms enantiotropic NLCs at T = 110–138 °C, smectic phases at T = 50–138 °C, and crystallises at T = 50 °C, the monomethacrylate forms NLCs at a wider temperature range (T = 98–185 °C) and crystallises at a lower temperature (T = 98 °C). These methacrylates were infinitely miscible and a 20/80 (w/w) mixture of the dimethacrylate/monoacrylate was able to form a NLC phase over a broad temperature range (T = 73–179 °C). The mixed NLC phase exhibited a Δn value of 0.36, even though the Δn values of the mono- and dimethacrylates were determined as 0.35 and 0.25, respectively, suggesting that the Δn of the mixture follows an additivity rule. Furthermore, the Δn of the NLC phase could be increased to 0.40 by photo-polymerisation.

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