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较系统地论述了高分子液晶态弹性体的合成、结构、液晶性质、热弹性质、光弹性质、粘弹性质和液体扩散性能,指出高分子液晶态弹性体是显示多种特异性能的高性能高分子材料。 相似文献
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《应用化学》2021,(10)
正19世纪80年代后期,奥地利植物学家Reinitzer和德国物理学家Lehmann共同发现了液晶,创立了液晶科学。20世纪70年代,液晶显示技术实现了革命性突破,风靡全球。液晶高分子的研究始于1937年的生物高分子液晶,随即受到广泛关注,尤其是杜邦公司基于溶致液晶芳香族聚酰胺的液晶纺丝技术在1972年推出的Kevlar系列高性能纤维产品,极大地推动了液晶高分子的飞速发展。近几十年来,基于热致液晶芳香族聚酯的高性能工程塑料如雨后春笋般不断涌现,高性能液晶高分子结构材料也成为全球研究热点。同时,侧链高分子液晶、聚合物分散液晶、聚合物稳定液晶、全息聚合物分散液晶以及新型结构的高分子液晶、超分子液晶在显示、传感、防伪、数据存储和电子封装等领域的应用也成为高性能液晶高分子功能材料的研究亮点。其中让我们倍感骄傲的是,我国科学家周其凤院士于1987年设计、合成了甲壳型液晶高分子,为液晶高分子科学与材料的发展做出了原创性贡献。当前,液晶材料的高分子化、高分子材料的液晶化已成为化学、材料、光学工程和信息工程等相关学科的重要研究方向,尤其近期在光存储、5G通讯领域中的应用备受关注。 相似文献
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环氧树脂基高分子分散液晶材料相分离过程的研究 总被引:1,自引:0,他引:1
根据高分子分散液晶材料在相分离过程中透光率的变化,研究了高分子分散液晶材料相分离过程与液晶浓度、温度的关系,观察到相分离过程中的周期性的起伏现象.对相分离过程与高分子分散液晶材料的电光性能作了初步探讨 相似文献
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苯并菲液晶材料能够自组装成柱状相,被广泛应用在光电材料方面、功能分子膜、信息储存等方面。苯并菲衍生物合成方法简单,并且具有非常良好的光电性质,引起了研究者的广泛关注。苯并菲液晶高分子可以分为不同的类型,其合成方法也不相同。本文在简单介绍苯并菲液晶高分子合成方法的同时,对苯并菲液晶高分子的应用也做简要的概括。 相似文献
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苯并菲液晶材料能够自组装成柱状相,被广泛应用在光电材料方面、功能分子膜、信息储存等方面。苯并菲衍生物合成方法简单,并且具有非常良好的光电性质,引起了研究者的广泛关注。苯并菲液晶高分子可以分为不同的类型,其合成方法也不相同。本文在简单介绍苯并菲液晶高分子合成方法的同时,对苯并菲液晶高分子的应用也做简要的概括。 相似文献
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Research in the late 1940s in academic institutions, most notably the University of Hull in the UK, led to the development of liquid crystal display technology in the 1970s, which has subsequently had a large impact throughout the world. The liquid crystal technology is based on simple organic molecules. Since the late 1980s, some liquid crystal scientists have turned their attention to investigating the effect of introducing a metal atom into the systems. This review focuses on the major developments in the field of ferrocenyl‐containing liquid crystals in which the organometallic group is situated in a terminal position with respect to the core of the molecule. Metallomesogens with terminal metal atoms are not very common, since it can be deduced from the theory of organic liquid crystals that bulky terminal groups would not be conducive to the stabilization of liquid crystal phases. Nevertheless, a terminal ferrocenyl group can stabilize a nematic liquid crystal phase and examples of this will be discussed in this review. Copyright © 2001 John Wiley & Sons Ltd. 相似文献
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This paper presents a review of the work on the molecular design of oxygen containing heterocyclic liquid crystals for nematic liquid crystal display applications and examines in some detail the correlations between the molecular structure of liquid crystalline oxygen containing heterocyclic derivatives and their physico-chemical and electro-optical properties. 相似文献
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An electrically controlled birefringence liquid crystal display has a problem over narrow viewing angle. To solve this problem, the authors proposed a double-layer electrically controlled birefringence liquid crystal display with a wide-viewing-angle cone under an applied voltage. In this device, each liquid crystal layer compensates the variation of retardation as a function of viewing angle. However, the optical compensation occurs only when certain voltages are applied. The objective of this paper is to propose a novel film compensated double-layer electrically controlled birefringence liquid crystal display that has a wide cone of view in any state. This device is based on the concept of compensation of retardation. 相似文献
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We will review the application of acoustic wave mass sensors in chemical and biological sensing with focus on quartz crystal microbalance and surface acoustic wave devices. In chemical sensing, it is unlikely that a single sensor will display a selective and reversible response to a given analyte in a mixture. Alternative strategies such as use of sensor arrays and sampling devices will be discussed to improve performance. We will also discuss applications of quartz crystal microbalance as biosensor in the liquid phase.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
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液晶取向膜是液晶显示器中的关键材料,为了制得性能优良的液晶取向膜,我们通过铃木偶联反应制备了3种含有不同末端基团的3,5-二氨基联苯,将制得的3种二胺单体分别与环丁烷四甲酸二酐聚合得到3种新型的聚酰亚胺。 利用核磁氢谱对单体和聚合物的结构进行了表征,测试了聚合物的溶解性、热稳定性以及用作液晶取向膜的性能。 结果表明,所得的聚酰亚胺具有良好的溶解性和热稳定性,经过机械摩擦后,末端带有甲氧基的聚酰亚胺能使液晶分子平行于摩擦方向取向,末端带有苯氧羰基和联苯氧羰基的聚酰亚胺能使液晶分子垂直于摩擦方向取向。 此类可溶性的聚酰亚胺液晶取向膜将简化制备工艺并在柔性显示器件中具有较大的应用价值。 相似文献
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液晶电视由于其优异的显示性能将会越来越受到青睐。本文简要综述了近年来电视用液晶材料的研究进展,归纳总结了这些液晶材料的合成方法及其热性能、介电各向异性、双折射率、粘度等特性。 相似文献
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液晶电视由于其优异的显示性能将会越来越受到青睐。本文简要综述了近年来电视用液晶材料的研究进展,归纳总结了这些液晶材料的合成方法及其热性能、介电各向异性、双折射率、粘度等特性。 相似文献
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Fluorinated liquid crystals--properties and applications 总被引:3,自引:0,他引:3
Hird M 《Chemical Society reviews》2007,36(12):2070-2095
This critical review begins with a brief, but essential, introduction to the special nature of liquid crystal materials, their peculiar properties, and their commercial applications, followed by an introductory insight into the remarkable nature of the fluoro substituent, and its fascinating influence on the properties of organic compounds. However, the main focus of the review is to discuss the enormous amount of exciting research on fluorinated liquid crystals that has been reported. The small size of the fluoro substituent enables its incorporation into all types of liquid crystal, including calamitic, discotic, banana, lyotropic, and polymers, without ruining the liquid crystalline nature of the material. However the fluoro substituent is larger than hydrogen, and hence causes a significant steric effect, which combined with the high polarity, confers many fascinating, and often remarkable, modifications to melting point, mesophase morphology and transition temperatures, and the many other very important physical properties, such as dielectric anisotropy, optical anisotropy, and visco-elastic properties. There are many different positions within a liquid crystal structure where a fluoro substituent can be located, including (i) a terminal position, (ii) within a terminal chain, as a semi-fluorinated or as a perfluorinated chain, or as one fluoro substituent at a chiral centre, (iii) as part of a linking group, and (iv) a lateral position in the core section. Such variety enables the interesting and advantageous tailoring of properties, both for the fundamental purposes of establishing structure-property relationships, and for materials targeted towards commercially-successful liquid crystal display applications. 相似文献
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《Liquid crystals》1998,24(1):91-98
Active Matrix (AM) LCDs and STN LCDs are the leading display technologies for portable applications such as notebook computers. Recently, new LCD device configurations and new LCD operation modes have been introduced. The existing technologies and the new LCD operation modes require improved liquid crystal materials. The history of liquid crystals for display applications and recent progress in new liquid crystal structures is presented. 相似文献