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本论文介绍了显示用液晶材料的发展情况和国内外液晶光栅的研究进展，重点介绍了高双折射率液晶的发展趋势尤其是端基为二氟乙烯基类液晶的进展，端基为二氟乙烯基类液晶具有优良的光电性能，具有广阔的发展前景。具有高双折射率（0.3≤Δn≤0.45）、低黏度、高清亮点和快速响应的液晶材料作为可见光和近红外光以及激光波频自适应光学系统校正器的光栅，近几年得到很快的发展。目前这些液晶光栅所用TFT-级别的高稳定性液晶材料，其Δn值小于0.2，响应速度很慢、可控波长范围比较窄小、光能利用率低、对温度的依赖性较大，不能满足校正器的宽波段校正量。为解决这一问题，本论文开展高双折射率、低黏度、高稳定性的二氟乙烯基二苯乙炔类液晶化合物的设计、合成、提纯、混配及其性能研究工作，以解决液晶材料黏度对温度的依赖性问题。以降低黏度、提高响应速度为目的研制出高双折射率（Δn≧0.3）、响应时间小于3毫秒（TN盒，d=2.5µm）、高电阻率（≥1013 Ω.cm）、阈值电压低于3.5V的新型向列相二氟乙烯基二苯乙炔类液晶材料，以满足用于宽波段的快速液晶校正器技术性能的要求，解决我国近红外光以及激光波频自适应光学校正系统难题。 目标化合物A、B和C系列化合物尚未有文献报道，其结构通过1HNMR、13CNMR、19FNMR、MS、IR谱图和元素分析证明所合成的化合物正确，通过阿贝折射仪(Abbe refractometer) 对其双折射率进行测定，Δn值均大于0.3；通过AR500液体流变仪对其黏度进行测定，效果比较理想；通过差示扫描量热仪(DSC)测量了它们的相变温度并结合偏光显微镜观察到得结构图，证明这些液晶化合物为热致性液晶，A类液晶化合物具有较高的清亮点（＞210℃），向列相温度范围超过128℃。 |
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2楼2011-05-12 14:28:48
3楼2011-05-18 11:44:48
【答案】应助回帖
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Mally89(金币+2): 感谢斑斑应助！~欢迎常来！~ 2011-05-18 16:04:32
Mally89(金币+2): 感谢斑斑应助！~欢迎常来！~ 2011-05-18 16:04:32
| This paper describes the use of liquid crystal display development and progress of domestic liquid crystal grating, highlighting the development of high birefringence liquid crystal is terminated trend is particularly vinyl fluoride crystal for the progress of the two fluoride end groups vinyl with excellent optical performance LCD with a bright future. |
4楼2011-05-18 15:54:08
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| With a high birefringence (0.3 ≤ Δn ≤ 0.45), low viscosity, high-definition highlights and fast response liquid crystal material as the visible and near infrared light and laser wave frequency correction adaptive optics system, the grating, is gaining rapidly in recent years development. |
5楼2011-05-18 15:54:46
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| These currently used in TFT-LCD grating high level of stability of liquid crystal material, the Δn is less than 0.2, the response is very slow, controlled relatively narrow wavelength range, low energy use, greater dependence on temperature can not be to meet the wide-band correction correction. |
6楼2011-05-18 15:55:18
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| To solve this problem, this paper carried out high birefringence, low viscosity, high stability of the vinyl fluoride liquid crystalline compounds diphenyl acetylene design, synthesis, purification, and properties of mixed working to address the liquid crystal material The temperature dependence of viscosity problems. |
7楼2011-05-18 15:55:49
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| To reduce viscosity and improve the response speed for the purpose of developing a high birefringence (Δn ≧ 0.3), response time of less than 3 ms (TN case, d = 2.5μm), high resistivity (≥ 1013 Ω.cm), the threshold value of the voltage is below 3.5V the new vinyl fluoride nematic liquid crystalline materials, diphenyl acetylene, to meet the LCD for quick broadband performance requirements correction technology to solve our near-infrared adaptive optics and laser wave frequency correction system problems. |
8楼2011-05-18 15:56:14
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| The compounds A, B and C series of compounds not yet reported in the literature, its structure by 1HNMR, 13CNMR, 19FNMR, MS, IR spectra and elemental analysis of the compounds is correct, by Abbe refractometer (Abbe refractometer) to its dual Determination of the refractive index, Δn values were greater than 0.3; through its AR500 rheometer viscosity of liquid was determined, the effect is more ideal; |
9楼2011-05-18 15:56:56
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| By differential scanning calorimetry (DSC) measurement of their phase transition temperature and was observed with polarized light microscopy structure, prove that the liquid crystal compounds as liquid crystalline, A class of liquid crystal compounds have a high clearing point (> 210 ℃), the nematic phase temperature range of more than 128 ℃. |
10楼2011-05-18 15:57:24
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