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shecf

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11楼2011-05-18 15:58:22
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liqi9673

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liushaohui(金币+200, 翻译EPI+1): 先给两百吧，一会再给 2011-05-19 08:54:15
This paper introduces the development of display with liquid crystal  materials and the research progress of domestic and foreign LCD grating.Mainly introduces the  development trend of high double refraction LCD.Especially LCD's progress of the  two fluorine vinyl class,which has excellent photoelectric performance and has broad prospects for development.In recent years, with high double refractive index （0.3≤Δn≤0.45）), low viscosity , high window and quick response LCD materials are used as visible and near infrared and laser wave frequency adaptive optics system corrector.At present, these LCD grating used TFT - rank high stability LCD materials Δn≤0.2.Response speed slow, controlled the wavelength range comparison narrow, efficiency of light energy utilization and dependence on the temperature,which  cannot satisfy the corrector with  the wide band statics.In order to solve the problem,this thesis develops the two fluorine vinyl diphenyl acetylene class liquid crystal compounds with high double refractive index, low viscosity and high stability  through design, synthesis, purification, mixed and properties of the research work. In order to reduce viscosity, improve the response speed,  develops high double refractive index (Δ n  0.3), response time is less than 3 milliseconds (TN box, d = 2.5 & micro; m), high resistivity (≧1013Ω.cm), threshold voltage is lower than  3.5 V to the new  2 fluorine vinyl diphenyl acetylene class LCD materials , in order to meet  the rapid wide band LCD corrector technical performance requirements, solve the our country near infrared laser wave frequency and adaptive optics calibration system problem.Target compound A, B and C series compounds have not been reported in the literature.The structures are correct by 1HNMR, 13CNMR, 19FNMR, MS, IR spectra and elemental analysis.Through the Abbe refractometer for its double refractive index  were determined, Δ n  are larger than 0.3.Through the AR500 liquid rheometry determines on its viscosity  , the effect is ideal.By DSC measuring their phase-change temperatures and combining with polarizing microscope charts, proves that these liquid crystal compounds for thermally  LCD.A  compounds has the higher clear window（＞210℃),phase temperature range is more than 128 ℃.
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12楼2011-05-18 16:40:56
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