کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1315332 976018 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Alignment behavior for novel triphenylene compounds possessing fluoroalkylated side chains on modified substrates
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Alignment behavior for novel triphenylene compounds possessing fluoroalkylated side chains on modified substrates
چکیده انگلیسی

The alignment behavior of the triphenylene compounds possessing fluoroalkylated side chains was investigated for the hexagonal columnar (Colh) mesophase on the polyimide-, cetyltrimethylammonium bromide (CTAB)-, and indium-SnO2 (ITO)-coated glass substrates by polarizing optical microscopy. It was found that 2,3,6,7,10,11-hexakis(1H,1H,2H,2H,3H,3H-perfluoroheptyloxy)- and 2,3,6,7,10,11-hexakis(1H,1H,2H,2H,3H,3H-perfluorononyloxy)-triphenylenes exhibit a spontaneous homeotropic alignment on these substrates, in contrast to the non-uniformity of alignment of Colh phase in the corresponding hydrocarbon mesogens. On the other hand, it was also found that 4,4,4-trifluorobutyloxy, 4,4,5,5,5-pentafluoropentyloxy and 4,4,5,5,6,6,6-heptafluorohexyloxy derivatives do not show such a spontaneous homeotropic alignment on these substrates. These results indicate that the spontaneous homeotropic alignment of the Colh phase could be easily attained by the introduction of an appropriate number and length of the fluoromethylene chains in the peripheral parts of discogens.

It is strongly indicated that a spontaneous homeotropic alignment of columnar phase could be easily attained by the introduction of fluoromethylene group in the peripheral chain of triphenylene mesogen. This alignment behavior may imply that the molecular alignment for the columnar mesophase is controlled by the molecular structure.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Fluorine Chemistry - Volume 127, Issue 8, August 2006, Pages 1096–1104
نویسندگان
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