Alignment behaviour of the discotic nematic phase of 2,3,6,7,10,11-hexa(4-n-octyloxybenzoyloxy)triphenylene on polyimide and cetyltrimethylammonium bromide coated substrates
Alignment behaviour of the discotic nematic phase of 2,3,6,7,10,11-hexa(4-n-octyloxybenzoyloxy)triphenylene on polyimide and cetyltrimethylammonium bromide coated substrates
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2,3,6,7,10,11-六(4-正辛氧基苯甲酰氧基)苯并菲的盘状向列相在聚酰亚胺和十六烷基三甲基溴化铵涂层基材上的取向行为
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发表时间：
2001
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通讯作者：
M. Ukon
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作者：
H. Monobe;Shoji Mima;T. Sugino;Y. Shimizu;M. Ukon
用偏光显微镜研究了2，3，6，7，10，11-hexa(4-n-octyloxybenzoyloxy)triphenylene(C8OBT)在聚酰亚胺或十六烷基三甲基溴化铵(CTAB)涂层衬底上的取向行为。用红外二色谱方法计算了C8OBT的三苯基核和羰基的平均序参数和方向。C8OBT的盘状向列(ND)相在聚酰亚胺薄膜上呈向同性排列，在玻璃衬底上呈典型的向列相纹影织构，在CTAB涂层的衬底上呈倾斜或平面均匀排列。三苯基核的有序参数在聚酰亚胺薄膜(S=0.6)上比在涂覆十六烷基三甲基溴化铵(S=0.2)的衬底上要高，而在与衬底无关的0.2~0.3范围内，羰基的有序参数基本不变。
The orientational behaviour of the nematic discotic phase of 2,3,6,7,10,11-hexa(4-n-octyloxybenzoyloxy)triphenylene (C8OBT) on substrates coated with a polyimide or cetyltrimethylammonium bromide (CTAB) was investigated by polarizing optical microscopy. The averaged order parameters and directions of the triphenylene core and the carbonyl groups of C8OBT were evaluated by an infrared dichroic method. The discotic nematic (ND) phase of C8OBT exhibits a homeotropic alignment on a polyimide film, a typical nematic schlieren texture on a glass substrate, and a tilted or planar homogeneous alignment on a CTAB-coated substrate. The order parameter of the triphenylene core is higher on a polyimide film (S = 0.6) than on a CTAB-coated substrate (S = 0.2), whereas that of the carbonyl groups remains roughly constant at 0.2 to 0.3 independent of the substrate for the ND phase.