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Effect of Center Unit on the Properties of Bent-Core Liquid Crystals

Author: LiShuangQuan
Tutor: ShenDong
School: East China University of Science and Technology
Course: Organic Chemistry
Keywords: 1,3,4 - thiadiazole 4 - substituted resorcinol Bent molecules Nematic
CLC: O753.2
Type: Master's thesis
Year: 2011
Downloads: 34
Quote: 0
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Abstract


This synthesis of three series with 1,3,4 - thiadiazol -centered radicals bent molecules , combined with polarizing observation and DSC melting point apparatus study their liquid crystal properties, find three thiadiazole series of compounds are N phase appears. Wherein the terminal group is an alkyl chain symmetric bending thiadiazole ring molecules with low melting point close to 100 ℃, clearing point temperature is lower than 165 ℃; symmetric rings ester series thiadiazole compound melting point higher clearing point were more than 360 ℃. Allyl-containing asymmetric thiadiazole bent molecules clearing point temperature is still high, but the N -phase temperature region presents a very wide (gt; 90 ℃). Two types of synthesized simultaneously with 4 - substituted resorcinol rings centered ester groups curved crystal molecule in which a 4 - nitro group resorcinol rings centered curved ester molecule , observed by polarizing melting point apparatus does not appear in the heating process liquid crystal phase occurs only in the cooling process smectic phase . It can be seen the introduction of a nitro group of the liquid crystal molecules will bend performance is greatly reduced, a nematic phase disappeared; the mixture of 4 - cyano- resorcinol ester bent molecules , considering its excellent performance, we will its more in-depth research, and applied research will be used as a material .

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CLC: > Mathematical sciences and chemical > Crystallography > Amorphous and class crystalline > Class crystalline > Liquid crystal
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