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液晶高分子的分子设计 总被引:1,自引:0,他引:1
简单介绍了液晶高分子的结构特点,分类及其应用状况,详细介绍了主链型和侧链型液晶高分子设计的新进展,根据溶臻主链型液晶高分子和热臻主链型液晶高分子分子结构的不同,提出今后设计主链液晶高分子的主要任务,从主链结构,液晶基元类型和柔性间隔出发介绍了侧链液晶高分子分子设计的关键,最后介绍了液晶高分子分子设计的发展趋势。 相似文献
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以Suzuki偶合反应为关键步骤,合成了以苯基噻吩为刚性棒状核,核的一端是带在噻吩环上的氰基,另一端是带在苯基上的极性多醚链的两亲性嵌段分子,采用POM测试方法考察了极性多醚链的末端基团为羟基、羧酸钠盐及可聚合的丙烯酰基的嵌段分子的液晶性质,以及通过丙烯酰基聚合形成的侧链型高分子的液晶性质,仅在极性多醚链的末端基团为羧酸钠盐的嵌段分子中观察到了层列相的液晶性质,而其他的嵌段化合物及高分子都没有热致性的液晶性质,对挑选出的样品的溶致性液晶性能也进行了研究,加水可以导致液晶相形成,提高液晶相的稳定性。 相似文献
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《Journal of the European Ceramic Society》2022,42(7):3204-3212
The polymer derived ceramics with complex shapes were prepared using the low-cost liquid crystal display (LCD) 3D printing technology. In this paper, we not only synthesized a liquid low-viscosity precursor with the photocurable group, but also provided a method to improve the forming precision and ceramic yield. The results showed that the introduction of KH570 could improve the curing accuracy, the ceramic yield. When the content of KH570 increased to 41 wt%, the curing shrinkage of the system decreased from 6.92% to 2.84%, the ceramic yield increased by 29.2%. Moreover, the mechanical properties of SiOC ceramics were studied and discussed. The bending strength of SiOC ceramic reached 44.2 MPa. And the ceramics after polishing were no cracks or other defects. This research demonstrates the huge potential for 3D - printed ceramics to become ubiquitous. 相似文献
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Masahiro Yoshida Xinghe Fan Hidekazu Yoshizawa Toshio Itahara Yoshinobu Kawano Yoshimitsu Uemura Yasuo Hatate 《Chemical Engineering Communications》2001,185(1):183-199
We synthesized a ferroelectric liquid crystal monomer possessing both carboxyl p-benzolxy-benzoate and carboxyl (s)-(-)-2-methylbutyl ester in its side chain. The liquid crystal and styrene monomers were utilized to form matrices of microspheres prepared by the dispersion or suspension polymerization. In this study, we characterized in detail physicochemical properties, thermo-responses, or electro-optical responses in the microspheres. We demonstrated the following results: (1) the volume-averaged diameters of microspheres prepared by the dispersion or suspension polymerization were of 1.5 or 45 μm, respectively, (2) the microspheres prepared showed liquid crystal abilities at the prescribed temperature, (3) the phase transition temperatures toward the liquid crystal phase of the microspheres prepared by copolymerizing the liquid crystal and styrene monomers could be decreased with increasing styrene monomer concentrations, and (4) the microspheres obtained remarkably exhibited electro-optical responses at the appointed voltage. 相似文献
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Liquid crystal display (LCD) is very important in the computer industry and many other areas. However, the application of LCD is limited by its narrow viewing angle, compared with a cathode ray tube (CRT) display. In this article a new type of LCD [ridge- and fringe field multidomain homeotropic (RFFMH) LCD], is introduced. In RFFMH LCD, a transparent photoimageable polymer resist is applied to build ridges on each pixel to control the liquid crystal pretilt direction. This photolithographic step imparts a wider viewing angle and simpler LCD production process. In this article the detailed process of building the ridge structure is described, and the thermal stability and chemical resistance of this polymer are studied. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 1197–1203, 1999 相似文献
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液晶弹性体(LCEs)是一种包含液晶基元轻度交联的聚合物网络,兼具聚合物网络的软弹性和液晶基元的各向异性。通过编程分子取向可使液晶弹性体在受到外界环境的刺激下实现非接触运动,表现出优异的弹性和驱动性能,在人工肌肉、软体机器人和可穿戴设备领域中显示了巨大的潜力。液晶弹性体纤维作为LCEs的一种常见存在形式,由于纤维内液晶基元取向度高,对于各类型刺激响应更为灵敏,且具有良好的可编程特性和优异的机械强度,使其在众多领域展现出广阔的应用前景。本文综述了液晶弹性体纤维的主要制备方法、分析了其对不同类型刺激的响应驱动机理,详细介绍了光响应型液晶弹性体的分类,并阐明了光热转换过程和远程驱动调控机制。此外,本文分析了不同驱动方式的液晶弹性体纤维体系,简要论述了纤维基LCEs复合材料在柔性传感、智能驱动、软体机器人、人工肌肉等方面的最新研究进展,并对其发展前景进行了展望。 相似文献
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液晶聚酯由于具有特异的液晶行为和高强高模性能而越来越受到人们的关注。本文对液晶聚酯的液晶态形成原因、液晶态类型与链结构的关系、液晶态热稳定性及其成型加工性能进行了讨论,指出了提高液晶态热稳定性的方法及液晶聚酯的发展趋势。 相似文献
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高鸿锦 《精细与专用化学品》1998,(Z1)
目前,中国液晶产业仍以低档TN-LCD为主体,但是进入90年代以来随着七八条STN-LCD生产线的建成,推动了整个产业向更高层次发展。随着国内LCD技术水平的提高,对液晶材料、导电玻璃及其它相关材料都提出了更高的要求。近年来LCD工业用各种材料产业化步伐加快,大大促进了相关科学研究的发展。 相似文献
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本文综述了近几年侧链液晶高分子(SLCP)研究的新进展,从SLCP的配合物,SLCP的应用前景和基于SLCP的新材料等方面进行了探讨。 相似文献
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