| 1. | The tm and tj of compounds 18 ii and 16 ii which have the trans conformation is higher than those of compounds 18 i and 16 i having cis conformation
化合物16和18中，反式构型的化合物16ii和isll的熔点和液晶态的清亮点均高于顺式构型的化合物161和isi 。 |
| 2. | With the increase of the end - group ' s volume , the melting points and clearing points followed the same trend while the stability of liquid crystalline states became worse
随着末端基脂肪链体积的增大，熔点和清亮点具有同样的变化趋势，液晶态的稳定性变差。 |
| 3. | The polymerisation of the monomer is carried out by uv curing the mixture when it was kept in a specific phase which can be obtained by controlling the temperature of the ferroelectric liquid crystal
单体的聚合通过维持该混合物处在一定的液晶态的条件下经紫外线固化来完成。 |
| 4. | The compounds with symmetric structure and different size crown ether rings , 16 and 18 , have higher tm and tj than those of the compounds 17 with the asymmetric structure . the tm and ti of compounds 18 is higher than the compounds 16
含有对称结构和不同大小冠醚环的化合物， 16和18 ，它们的熔点和液晶态的清亮点高于含有不对称冠醚环的化合物17 ，且化合物18的熔点和液晶态的清亮点也高于化合物16的熔点和清亮点。 |
| 5. | The tm and tj of the compounds 17 ii synthesized from the higher tm amdb15c5 is higher than those of compounds 171 . it was found that the changes of the liquid crystal phase have corresponding relationship to the photos of all three series of compounds separately
还发现由熔点高的二氨基二苯并15冠5合成的化合物17ii的熔点和液晶态的清亮点高于山熔点低的二氨基二苯并15冠5合成的化合物171的熔点和液晶态的清亮点。 |
| 6. | Phenyl group introducing to cholesteryl ester molecules can enhance the phase transition temperatures of the liquid crystals and their stability . an increase in the chain length for cholesteryl dicarboxylate samples reduced stability of liquid crystal phases . while coattail - like structures on the ester group of the molecules have an adverse effect to form cholesteryl liquid crystal phase
化学结构对液晶性的影响表现为：分子中引入苯环刚性结构可以提高液晶的相变温度和稳定性；脂族二羧酸胆甾醇酯中脂肪链的长度增加会降低液晶的稳定性；而末端含有燕尾结构则对液晶态的形成产生不利影响。 |
| 7. | Polymer networks have been produced in a variety of liquid crystal phases in cells without surface treatment . the liquid crystal / monomer mixtures are prepared using a ferroelectric liquid crystal and a diacrylate monomer . the polymerisation of the monomer is carried out by uv curing the mixture when it was kept in a specific phase which can be obtained by controlling the temperature of the ferroelectric liquid crystal . both the monomer and the polymer network will depress phase transition temperatures . the effects of the polymer network on the packing arrangement of the ferroelectric liquid crystal molecules are examined by means of optical microscopy . the molecular packing arrangement of the ferroelectric liquid crystal in a specific mesogenic phase is frozen on the formation of a polymer network in the ferroelectric liquid crystal in that phase . the existence of the diacrylate based polymer network can improve the electrooptical switching of the ferroelectric liquid crystal
在灌装于未经表面处理的样品盒内处于不同状态的液晶中制备聚合体网络.液晶/单体混合物由铁电液晶和双丙烯酸单体制成.单体的聚合通过维持该混合物处在一定的液晶态的条件下经紫外线固化来完成.不同的液晶态可通过控制铁电液晶的温度来获得.双丙烯酸单体或聚合体网络的存在会导致铁电液晶载体的相变温度降低.通过光学显微镜可观察聚合体网络对铁电液晶分子组合排列的影响.结果发现:在某一液晶态中铁电液晶分子的组合排列可被在该液晶态中聚合而成的聚合体网络所稳定,双丙烯酸基聚合体网络的存在可改良铁电液晶的电光开关特性 |
| 8. | 5 , both melting point ( tm ) and isotropization temperature ( tj ) of all the three series compounds change regularly with the carbon numbers of the end alkoxy group increased . there is a gradual increase in smectic phase length and in the smectic - nemetic transition temperature . at the same time there is a gradual decrease in nemetic phase length
五，三个类型化合物16ia至16id 、 16ila至16lid 、 17ia至17id 、 17ila至17lid 、 18ia至18id和18ila至18lid的熔点和液晶态的清亮点均化合物分子中末端烷氧基增大逐渐降低；近晶相的温度范围和近晶相一向列相转变温度逐渐增大，而向列相的温度范围递减。 |
| 9. | Side chain polyurethanes with azo group are characterized and confirmed by ftir , uv - vis , dsc , vpo , z - scan , polarize microscope . the results show that the end - group and the flexibility of main chain affects the growing up of liquid crystalline phase greatly . because the determinable way of detection is defective , it was not founded the liquid crystalline behavior obviously contributes to the non1inear optical thection
最后，在分析讨论实验结果的基础上，指出侧链型聚氨酯液晶中侧链介晶基元的末端基团及主链的柔性对其液晶态的形成有重要影响；由于检测手段的不齐备，未能观察到熔致型聚氨酯液晶的液晶行为对其非线性光学效应的贡献作用。 |
