کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5211584 1382958 2007 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Liquid crystalline compounds with various rigid siloxane frameworks
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Liquid crystalline compounds with various rigid siloxane frameworks
چکیده انگلیسی
Novel oligosiloxanes with mesogenic group were synthesized from tetrakis(dimethylsiloxy)silane (cross-structured), 1,3,5,7-tetramethylcyclotetrasiloxane (cubic-structured), tetraphenyltetrahydroxycyclotetrasiloxane (cyclic-structured, having bulky phenyl group), tetrakis(dimethylsilyl)octaphenylsilsesquioxane (double-decker type), and hydride Q resin (branch structured) as cores and 4-allyloxy-4′-cyanobiphenyl (M1) and cholesteryl-10-undecenoate (M2) as mesogenic derivatives via hydrosilylation reaction catalyzed by Karstedt's catalyst. The phase behaviors of these oligomeric compounds with various structures of the mesogenic group and the core were studied by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (XRD) measurements. Liquid crystalline properties were observed for almost all of the synthesized oligomers in a wide temperature range.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Reactive and Functional Polymers - Volume 67, Issue 11, November 2007, Pages 1200-1210
نویسندگان
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