共查询到19条相似文献,搜索用时 125 毫秒
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高性能热致液晶聚合物LCP基板卷材开发与应用 总被引:1,自引:0,他引:1
文章采用4-乙酰氧基苯甲酸(ABA)6-乙酰氧基-2-萘甲酸(ANA)共缩聚合加入4,4、二氨基二苯醚(ODA)聚醚酰亚胺(PEI),通过刚性棒状大分子链受热熔融形成一种兼有固体和液体的部分性质的液晶态聚合物通过涂布延伸,二阶段溶浸聚合溶融缩聚制备LCP基板卷材。 相似文献
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液晶聚合物是在一定条件下以液晶态存在的聚合物,最早是从生物和天然高分子中发现的液晶现象发展起来的,并伴随着液晶科学和高分子科学的发展不断壮大.特别是20世纪70、80年代发展起来的溶致型和热致型主链液晶聚合物,相继打开了工业化应用的大门,并广泛应用于电子电器、航空航天和光纤通信等诸多领域.这些重大成果的应用为液晶聚合物... 相似文献
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谭代木 《电子工业专用设备》2013,(7):44-46,56
通过对液晶显示器制造过程中的关键工序---光刻胶涂布工艺、原理进行分析,对光刻胶涂布设备参数进行调整等,为生产LCD提高合格率提供参考。 相似文献
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《中国激光》2016,(3)
报道了一种针对红绿蓝三原色激光同时敏感的电控全息聚合物分散液晶光栅(H-PDLC)的制备及其特性研究。通过在预聚物液晶体系中同时加入两组不同的光引发剂和协引发剂,孟加拉红与N-苯基甘氨酸、亚甲基蓝与对甲基苯磺酸水合物,以及纳米银颗粒,实现单片样品三波段激光(632.8、532、441.6 nm)激发写入的体全息光栅。实验测量和研究了该液晶光栅的衍射效率和电光特性。此外,通过显示图像的三原色衍射实现裸眼立体显示中左眼和右眼的图像分束功能。实验结果表明,三色聚合物分散液晶体光栅在红绿蓝三个波段均具有较高的衍射效率和良好的电控开关特性,在裸眼立体显示及相关领域有良好的应用前景。 相似文献
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对还原深蓝BO进行磺化改性处理引入磺酸基,使其成为双亲性化合物。磺化改性后的还原深蓝BO分子在一定浓度的水溶液中自组装成溶致液晶相。将溶液在玻璃衬底上展开,同时在其上覆盖另一载玻片进行摩擦涂膜并剪切诱导分子取向分布,溶剂自然蒸发后形成固态偏振薄膜。用红外光谱对改性后的还原深蓝BO分子的结构进行表征,用偏光显微镜、紫外可见分光光度计研究其水溶液及其固态偏振薄膜的性质。结果表明:磺酸基的引入改变了还原深蓝BO分子的极性,它所形成的固态偏振薄膜具有良好的光学偏振效率,最佳偏振效率达到90%以上,耐热性能测试表明该偏振薄膜的最高耐热温度在200℃以上。 相似文献
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物理技术与方法在溶致液晶结构研究中的应用 总被引:5,自引:2,他引:5
现代物理技术与方法的发展为液晶科学的研究提供了丰富的手段。文章介绍了在溶致液晶研究中的一些常用物理技术与方法如偏光显微镜、量热法、X射线,同时重点介绍了一些新兴的非常规研究手段诸如中子散射技术、光谱技术、电子显微镜、扫描探针显微镜(扫描隧道显微镜、原子力显微镜)。并对诸多技术与方法近年来在国内外的应用进展做了简单介绍,且对各种技术与方法的优缺点进行了类比。 相似文献
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P.V. Braun P. Osenar M. Twardowski G.N. Tew S.I. Stupp 《Advanced functional materials》2005,15(11):1745-1750
Aqueous gel‐like lyotropic liquid crystals with extensive hydrogen bonding and nanoscale hydrophilic compartments have been used to define the growth of macroscopic nanotemplated CdS and CdTe thin films. These mesoporous semiconductor films contain a hexagonal array of 2.5 nm pores, 7 nm center‐to‐center, that extend in an aligned fashion perpendicular to the substrate. The CdS is deposited on a polypropylene substrate by a reaction between Cd(NO3)2 dissolved in the liquid crystal and H2S transported via diffusion through the substrate. The CdTe is electrodeposited on indium‐tin‐oxide‐coated glass from TeO2 and Cd(NO3)2, both of which are dissolved in the liquid‐crystal template. The porous nature of the CdTe films enables chemical transformations of the entire bulk of the film. As electrodeposited, the CdTe films are Te rich and, in contrast to a non‐templated film, the excess Te could be removed via a chemical treatment, proving the continuity of the pores in the nanotemplated films. These results suggest that liquid‐crystal lithography with hydrogen‐bonding amphiphiles may be a useful approach to create materials with nanoscale features over macroscopic dimensions. 相似文献
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Significant anisotropic electrical conduction in organosilica films is achieved by long‐range orientation of electroactive perylene bisimide (PBI) moieties in the silica scaffold. A new PBI‐based organosilane precursor is designed with lyotropic liquid‐crystalline properties. The PBI precursor with triethoxysilylphenyl groups exhibits a hexagonal columnar phase in the presence of organic solvents. The lyotropic liquid‐crystalline behavior of the precursor enables the preparation of dip‐coated films consisting of uniaxially aligned columnar aggregates of the PBI precursor on the centimeter scale. The oriented structure is successfully fixed by in situ polycondensation, which yields insoluble, thermally stable PBI–silica hybrid films. The oriented organosilica films doped with hydrazine exhibit high electrical conductivities on the order of 10?2 S cm?1, which are at the highest level for organosilica materials, and are comparable to those of all‐organic PBI assemblies. Definite anisotropy of conductivities is also found for these films. The present results suggest that the induction of significant electrical properties in organic molecular assemblies is compatible with the structural stabilization by inorganic–organic hybridization. 相似文献
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生长温度对SiGe合金的性能有重要影响.在双腔超高真空化学气相淀积生长中,通常采用液氮冷却的方法.该生长模式下,通入乙硅烷时腔内的生长气压约为10-5Pa,SiGe的最低生长温度约为550℃.为了降低生长温度,文中采用了不用液氮冷却的模式.腔内生长气压约为10-2Pa,增加3个数量级,并且将牛长温度降到了485℃,远低于传统的牛长温度.DCXRD测试和TEM图像表明,生长的SiGe薄膜和SiGe/Si超品格具有良好的晶格质量.结果证明,在LJHV/CVD系统中,这是一种有效的实现SiGe低温生长的方法. 相似文献
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A Lyotropic Liquid‐Crystal‐Based Assembly Avenue toward Highly Oriented Vanadium Pentoxide/Graphene Films for Flexible Energy Storage
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Haiqing Liu Yanping Tang Chi Wang Zhixiao Xu Chongqing Yang Tao Huang Fan Zhang Dongqing Wu Xinliang Feng 《Advanced functional materials》2017,27(12)
A novel lyotropic liquid‐crystal (LC) based assembly strategy is developed for the first time, to fabricate composite films of vanadium pentoxide (V2O5) nanobelts and graphene oxide (GO) sheets, with highly oriented layered structures. It is found that similar lamellar LC phases can be simply established by V2O5 nanobelts alone or by a mixture of V2O5 nanobelts and GO nanosheets in their aqueous dispersions. More importantly, the LC phases can be retained with any proportion of V2O5 nanobelts and GO, which allows facile optimization of the ratio of each component in the resulting films. Named VrGO, composite films manifest high electrical conductivity, good mechanical stability, and excellent flexibility, which allow them to be utilized as high performance electrodes in flexible energy storage devices. As demonstrated in this work, the VrGO films containing 67 wt% V2O5 exhibit excellent capacitance of 166 F g?1 at 10 A g?1; superior to those of the previously reported composites of V2O5 and nanocarbon. Moreover, the VrGO film in flexible lithium ion batteries delivers a high capacity of 215 mAh g?1 at 0.1 A g?1; comparable to the best V2O5 based cathode materials. 相似文献