کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9770218 | 1501942 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structure and properties of novel three-armed star-shaped liquid crystals
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Structure and properties of novel three-armed star-shaped liquid crystals Structure and properties of novel three-armed star-shaped liquid crystals](/preview/png/9770218.png)
چکیده انگلیسی
A series of novel three-armed star-shaped liquid crystals based on 1,3,5-trihydroxybenzene as a core and Ï-[4-(p-alkoxybenzoloxy)phenoxycarbonyl]valeric acid as mesogenic arms were synthesized. Their chemical structures were confirmed by FTIR and 1H NMR spectra, their mesomorphic properties and phase behavior were investigated using differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (XRD) measurements. The results show that the three-armed star-shaped liquid crystals exhibit a broad range of liquid crystalline phases at moderate temperature, no crystallization but vitrifying to form glass-forming mesogens during cooling from the isotropic melt. The formed crystals are glassy liquid crystals. The three-armed molecules are highly thermal stable and the mesomorphic ranges (ÎT) become wider as the terminal alkoxy chains become longer. Threadlike texture, a typical nematic phase, can be observed in the liquid crystalline state.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 741, Issues 1â3, 2 May 2005, Pages 135-140
Journal: Journal of Molecular Structure - Volume 741, Issues 1â3, 2 May 2005, Pages 135-140
نویسندگان
Bao-Yan Zhang, Dan-Shu Yao, Fan-Bao Meng, Yuan-Hao Li,