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Synthesis and Properties of New Difluorovinyl Tolane Liquid Crystal Comounds

Author: LiuYun
Tutor: ZhangZhiYong
School: Wuhan Polytechnic University
Course: Applied Chemistry
Keywords: difluoroVinyl liquid crystal Compounds t01ane synthe Sis high birefringence low-visCO Sity
CLC: O753.2
Type: Master's thesis
Year: 2011
Downloads: 58
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Abstract


The Liquid Crystal Optical Grating(LCOG)has been greatlyimproved the se years It will demand to be used the 1iquid crystal materialwith high birefringence(0 3≤An≤0 45)，low-visco sity，high clearingPoint and fast re sPonse The 1iquid crystal material can be used as thevisible and near infrared 1ight and laser wave frequencY correctionadaptive optic s system In recent years，LCOG has been greatly improvedThe se currently liquid crystal material used in LCOG．the An value is le s sthan 0 2，the re sPonse speed is slow-，the length range of contr011ed waveis relatively narrow-，slow-efficiency of light energy utilization anddependence on the temperature Because of the se drawbacks，it cannotsatisfy the corrector with the wide band static s According toliterature，the liquid crystal compounds with difluoroVinyl has excellentphotoelectricity propertie s and low-visco sity，and tolane conjugatedstructural has high birefringence There are good pro spects in the liquidcrystal compounds In order to develop high birefringence，low-ervisco sity，improve re sponse time(<3ms)，meet the requirement for fastbroadband technologY LCD correction performance s，and solve problemsof our near-infrared adaptive optic s and laser wave frequency correctionsystem This paper studie s on the difluoroVinyl tolane 1iquid crystal s，which has high birefringence，10w-vi sco sity，high stability through de sign，synthe si s，purification and propertie s In this way we will solve theproblem that low-vi sco sity and high birefringence of liquid crystalgratingThis Paper de signs and synthe size s nPUTPVF．nUTPVF and nPTPVFthree serie s of 12 target compounds All of them are not reported yet Thestructure s of the se compounds were confirmed by’HNMR，”CNMR，’’FNMR，MS，IR and elemental analy sis The birefringence of nPUTPVF An Value s 1s more than 0 4：nU l PVF 1S between 0 19-0 2 and nPl PVF 1Sbetween 0 20-0 27 AcCOrding to their phase transition temperaturemeasured by differential SCanning calorimetry(DSC)，it show-s that thenPUTPVF has a high clearing point(>210℃、and a wide nematic phasetemperature range (> 128℃)；the clearing point of nUTPVF is below-50℃and the nematic phase temperature is le s s than 12℃：the clearingpoint of the nUTPVF is between 80-1 00℃and the nematic phasetemperature range is 20-40℃When the visco sity is measured at differenttemperature S．the effect is very ideal

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