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Bis (P—bromobenzylamino) ethane and 1,2—bis (m—Iodobenzylamino) ethane may be prepared by condensation of the corresponding halo benzaldehyde with ethylenediamine and followed by catalytic hydrogenation of the Schiff's bases over Pto_2 in glacial acetic acid solutions: Both Ⅱa and Ⅱb may react in neutral mediam with aldehydes to form well—defined crystalline tetrahydro—imidazole, which may be served as derivatives of identification for aldehydes: Under the same condition, however,Ⅱb may ...

用1，2-二乙烷与二十余种醛类作用，得到有固定熔点的晶体衍生物，它们的熔点分布在85—210℃之间，产率为40—96％，这试剂与甲基酮类在相同条件下无反应，因此，它可作为鉴定醛类的专属试剂。 2。上述衍生物用稀盐酸在室溫处理，能发生水解，可以定量地收回原来的醛，因此这试剂又可作为分离醛类的试剂。 3。上述衍生物可以用非水滴定法半微量地测定其分子量可作为鉴定醛类的另一项参考数据。 4.1，2-二乙烷与醛类能生成晶体衍生物，但这试剂也与甲基酮在同样条件下发生反应，所以不适合作为鉴定醛类的专属试剂。

The glass and crystalline glass-solders of Li2O-ZnO-SiO2 system were prepared by conventional melt technology. The various factors effecting on glass ceramics and glass were investigated,which include glass chemical composition and heat-treatment and so on. And then by means of XRD, DTA, IR and SEM, the structure and properties of the glass and glass-ceramic were studied. The coefficient of linear expansion , transform temperature and soft temperature wer measured. And then the factors that effect the mechanical strength of glass-ceramic were discussed and the fluxion property was determined and the crystallization course and mechanism were discussed, which can provide certain therial reference value for practice producing and glass seals to glass, ceramics and metal.

用高温熔融法制备了Li_2O-ZnO-SiO_2系统玻璃及其结晶型玻璃焊料，探讨了各种因素(包括玻璃组成、热处理制度等)对微晶玻璃的结构和性能的影响；利用X射线衍射分析、DTA、红外光谱分析以及扫描电镜等现代测试手段，对玻璃的结构与性能进行研究，测定了玻璃及微晶玻璃的线膨胀系数、转变温度和软化温度，同时对影响微晶玻璃的强度的因素进行了探讨，并对该体系玻璃的流散性进行了测定，对它的析晶过程和析晶机理进行探讨，为实际生产和与玻璃、陶瓷及金属封接提供了一定的理论参考价值。

The crystalline and thermochemical property under ultrasonic effect were discussed.

揭示了超声对3种不同结晶形态四钼酸铵结晶的晶型和热化学性质的影响规律。

In addition, the formation of liquid crystalline glass of thermotropic polymers was analyzed on the basis of thermodynamics and kinetics.

并在热力学与动力学共同作用的基础上，讨论了热致型液晶聚合物液晶玻璃态的形成，提出了固化温度大于结晶温度是液晶玻璃态产生的必要条件。

Dr. Baird is a pioneer in the study of liquid crystalline polymers, and his work on the rheology of these materials led to the development of thermoplastic composites reinforced with thermotropic LCPs.

贝尔德博士是在液体结晶聚合物研究的先驱，他对导致热塑性复合材料的流变学发展的这些工作，加强与热致液晶聚合物。

he isothermal and non-isothermal crystallization behaviors of blends o f thermotropic liquid crystalline polyester and PET have been studied.

用差示扫描量热法对聚对苯二甲酸乙二酯／热致液晶高分子共混体系的等温和非等温结晶行为进行了研究。

The crystalline morphology of a thermotropic aromatic copolyester with flexible spacer has been studied by microscopy techniques.

采用偏光显微镜、扫描和透射电镜从不同层次的结构水平上研究了含柔性间隔基热致液晶性共聚酯的结晶形态。

The results demonstrate that this novel polyamide has an obvious liquid crystalline behavior when being heated into molten state, and is a typical kind of thermotropic liquid crystal.

结果表明，该聚酰胺在熔融状态下具有明显的液晶态结构，属于典型的主链型热致液

Polypropylene ; thermotropic liquid crystalline polymer ; hybrid composite ; mechanical properties ; dynamic mechanical analysis

聚丙烯；热致液晶聚合物；混杂复合材料；力学性能；动态力学分析

Thermotropic liquid crystalline of PSLG was revealed by the DSC measurements.

经表征，合成的单体SLGNCA和PSLG均具有光学活性。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。