Highly birefringent polymer films from the photo-crosslinking polymerisation of bistolane-based methacrylate monomers
Highly birefringent polymer films from the photo-crosslinking polymerisation of bistolane-based methacrylate monomers
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DOI：
10.1080/02678292.2015.1053542
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发表时间：
2015-06
期刊：
影响因子：
2.2
通讯作者：
Y. Arakawa;Hiroki Kuwahara;Koichi Sakajiri;Sungmin Kang;M. Tokita;G. Konishi
中科院分区：
文献类型：
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作者：
Y. Arakawa;Hiroki Kuwahara;Koichi Sakajiri;Sungmin Kang;M. Tokita;G. Konishi
单甲基丙烯酸酯和二甲基丙烯酸酯混合物的光聚合，包含一个中心氟取代苯环的双烷部分，导致形成高度双折射的聚合物薄膜（Δn = 0.40），这是在向列相液晶（NLC）中获得的。二甲基丙烯酸酯在温度为110-138℃时形成对映性NLCs，在温度为50 - 138℃时形成近晶相，在温度为50℃时结晶，而单甲基丙烯酸酯形成NLCs的温度范围更广（T = 98 - 185℃），结晶温度更低（T = 98℃）。这些甲基丙烯酸酯具有无限混溶性，二甲基丙烯酸酯/单丙烯酸酯的20/80 （w/w）混合物能够在很宽的温度范围内（T = 73-179℃）形成NLC相。混合NLC相的Δn值为0.36，而单甲基丙烯酸酯和二甲基丙烯酸酯的Δn值分别为0.35和0.25，这表明混合物的Δn遵循可加性规则。此外，NLC相的Δn可以通过光聚合提高到0.40。
The photo-polymerisation of mixtures of mono- and di-methacrylates, 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, whereas 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 an 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 di-methacrylates 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.