Liquid crystal alignment behaviours on poly(methyl methacrylate) having polyhedral oligomeric silsesquioxane groups
Liquid crystal alignment behaviours on poly(methyl methacrylate) having polyhedral oligomeric silsesquioxane groups
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DOI：
10.1080/02678292.2014.960487
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发表时间：
2015-01
期刊：
影响因子：
2.2
通讯作者：
Hyo Kang;Hyunkee Hong;Dong‐Gyun Kim;Eun-Ho Sohn;Jimin Shim;D. Kang;Jong‐Chan Lee
中科院分区：
文献类型：
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作者：
Hyo Kang;Hyunkee Hong;Dong‐Gyun Kim;Eun-Ho Sohn;Jimin Shim;D. Kang;Jong‐Chan Lee
以甲基丙烯酸异丁基POSS （MA-POSS）和甲基丙烯酸甲酯为单体，通过自由基聚合（FRP）法制备了一系列含有多面体低聚硅氧烷（POSS）基团（mcp#）的聚甲基丙烯酸甲酯衍生物，研究了这些聚合物薄膜的液晶（LC）取向性能。由含有100 mol% MA-POSS单元（MCP100）的聚合物薄膜制成的LC电池显示出垂直的LC排列，预倾角约为90°。MCP100薄膜上的垂直LC定向行为归因于MCP100表面的疏水性，其表面能小于由非极性大块POSS基团产生的约23 mJ/m2。使用MCP100作为LC对准层制备的LC电池具有良好的电光特性，如电压保持比（VHR）和残余直流电压（R-DC）。
A series of poly(methyl methacrylate) derivatives containing polyhedral oligomeric silsesquioxane (POSS) groups (MCP#) were synthesised via free radical polymerisation (FRP) using methacryl isobutyl POSS (MA-POSS) and methyl methacrylate as monomers to investigate liquid crystal (LC) alignment property of these polymer films. The LC cells made from the films of the polymers having 100 mol% of MA-POSS units (MCP100) showed vertical LC alignment having a pretilt angle of about 90°. The vertical LC alignment behaviour on the MCP100 film was ascribed to the very hydrophobic MCP100 surface having the surface energy value smaller than about 23 mJ/m2 generated by the nonpolar bulky POSS group. Good electro-optical characteristics, such as voltage holding ratio (VHR) and residual DC voltage (R-DC), were observed for the LC cells fabricated using MCP100 as a LC alignment layer.