液晶

By investigating a series of homologous cholesteric liquid crystal materials,it is found that the cholesteric liquid crystal phase transition temperatures reduce along with change length of the molecules.

首次报告利用液晶分子的机械旋转模型研究胆甾相液晶材料相变与分子构造相关性的研究结果。通过对不同质量的系列胆甾相液晶材料的研究，发现材料的相变温度随着分子的变长而降低。

In chapter 2,we establish theformulation of the extended mean-field theory that can be applied to cholesteric liquidcrystals,and we apply this extended mean-field theory to study the helical structure ofcholesteric liquid crystals.

在第二章中，我们将文献[6]中丝状液晶中的广义平均场方法推广到了螺旋状液晶体系，并用这一方法讨论了螺旋状液晶中分子指向矢的螺旋结构。

The polymers substituted with hexyl and octyl on phenylene also show a nematic phase, however, the nematic phase disappears for the polymer substituted with decyl. The polymers substituted with alkoxy on phenylene self-organize into a lamellar structure, and their phase behavior shows obvious dependence on the alkoxy length.

苯环上烷基、烷氧基取代的聚合物都具有纤维状的特征形貌，当烷基、烷氧基碳原子数为6时在高温都存在一个向列液晶相，当烷基碳原子数增加到10时液晶相消失，而烷氧基碳原子数增加到12时该向列液晶相仍然存在。

The researches show that polymer PM5MPP and copolymer M5MPP/MMEANB are enantiotropic liquid crystalline polymers, but polymer PMMEANB has no liquid crystalline properties....

结果表明，均聚物PM 5MPP及共聚物(M 5MPP/MMEANB)属双向液晶高分子；PMMEANB属于非晶性高分子。证实了分子间吸电子与给电子基团相互作用有利于提高液晶高分子热稳定性，共聚物(M 5MPP/MMEANB)具有较宽的液晶相温度范围。

Then according to the different ways of mesogenic units connecting to the ladderlike main-chain, the ladderlike polysiloxane liquid crystals are classified into fishbonelike and canoelike polysiloxane liquid crystals.

介绍了梯形聚硅氧烷液晶的结构特点，根据液晶基元接枝到梯形高分子主链上的方式，将梯形聚硅氧烷液晶分为鱼骨形和划艇形两种。

The chemical structure and mesomorphic properties of this series of compounds were characterized by FT-IR, MS, 1H NMR, polarizing optical microscopy and DSC techniques.

利用FT-IR、MS、1H NMR、POM、DSC 表证了所得化合物的结构和介晶性，并选择几种双液晶基元液晶测定了它们的机械黏度和在主体液晶中的螺旋扭曲力

Shearing force can induce molecular orientation with different mesomorphic behaviors at different temperature. Electric field induce biphenyl mesogens align parallel to the direction of applied electric field.

通过本论文的工作，阐述了含联苯液晶基元的硬主链型侧链液晶聚炔及其单体的结晶与液晶行为、结晶形貌和外场诱导的分子取向行为，为开发新型高性能材料提供必要的结构依据。

The first series belongs to UV-curable rod-like diacrylates containing bis-stilbene as the mesogenic core. Most of them show no mesomorphic behavior except that M2 and M4 exhibit a SA phase.

第一系列为小分子液晶材料，核心为三苯基双乙烯，两边末端为含有可进行紫外光聚合之acrylate基团，此系列材料皆不具有向列型液晶相，只有M2和M4具有层列型液晶相。

Differential scanning calorimetry and polarizing microscope were used to study their liquid properties. Among them, nine are found to exhibit liquid crystal properties, and most of them displayed as heating monotropic liquid crystals. There are one or two mesophases and certain phase transition temperature,Δ H and temperature range of liquid crystal.

用差示扫描量热仪和偏光显微镜研究了其液晶性，发现其中九个配合物具有液晶性，多为升温单变液晶，有一至两个中介相，有确定的相转变温度、热焓和相变区间。

Among the five oily ingredients tested, C16~18 fatty alcohol can well facilitate the formation of liquid crystal; polar materials PPG-15 stearyl ether and stearic acid are not favorable for the formation of liquid crystal, while non-polar material white oil shows no effect on the formation of liquid crystal.

在所研究的五种油质原料中，十六~十八醇可以很好的促进液晶结构的形成；极性的 PPG-15硬脂醚与十八酸不利于液晶的形成；而非极性的白油则不影响体系液晶结构的形成。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。