查询词典 polymer

The present invention relates to the depolymering cyclization reaction of aromatic dithio ether polymer to prepare aromatic cyclic dithio ether compound under the presence of mercapto group containing compound and alkali matter.

本发明涉及利用芳香双硫醚聚合物的解聚成环反应来制备芳香双硫醚环状化合物的方法。该方法采用芳香双硫醚聚合物在含巯基的化合物和碱性物质存在的条件下发生解聚成环反应生成双硫醚环状化合物。

In an agitated reactor, the polymer was dissolved in cyclohexane at 60-70 °C and purged with nitrogen.

在一个反应釜，聚合物溶解于环己烷，在60-70 ° C和无机氮。

The copolymerization of cycloolefin and α-olefin, and structure of the obtained polymer are significantly affected by the structure and symmetry of metallocene catalysts, electronic effect and steric hindrance of ligands.

着重介绍了加成聚合法中茂金属催化剂的结构对称性、配体的电子和体积效应、反应条件等对聚合活性、产物组成与序列分布及相关热性能的影响。

The copolymerization of cycloolefin and α-olefin,and the structure of the obtained polymer are significantly affected by the structure and symmetry of metallocene catalysts ,electronic effect and steric hindrance of ligands.

着重介绍了加成聚合法中茂金属催化剂的结构对称性、配体的电子和体积效应、反应条件等对聚合活性、产物组成与序列分布及相关热性能的影响。

We composed the active cyclostyle polymerand then inserted the rare-earth to the cyclostyle polymer by sol-gel method. Then weprepared the new type nanometer oganic rare-earth compounds.

我们设计合成了纳米稀土金属溶胶和活性模板聚合物，然后用溶胶-凝胶法在活性模板聚合物上导入纳米稀土金属化合物，进而制备了新型纳米有机稀土金属复合物。

DNA refers to deoxyribonucleic the acid deoxyribonucleic acid (chromosome and gene constituent) the deaeration nucleotide high polymer, is the chromosome principal constituent.

DNA 指deoxyribonucleic acid 脱氧核糖核酸(染色体和基因的组成部分)脱氧核苷酸的高聚物，是染色体的主要成分。

To improve the environmental performance of polymer degradation, decomposer easy that waste recovery and disposal friendlytridion environment.

改善环保性能采用聚合物降解剂、分解剂等使废弃物易回收处理，利于环保。

All the decomposition temperature of the polymer was above 300 ℃, with a good thermal stability.

所有共聚物的热分解温度均在300℃以上，具有良好的热稳定性。

In this part of thesis,the definiens, origin and development of CMEs are mentioned,and the preparations,types and characterization techniques of CMEs are introduced subsequently.In addition,the preparation methods and applications in electrochemical analysis of functional silica and polymer modified electrodes are detailedly reviewed.

本部分首先简单介绍了化学修饰电极的定义和来源与兴起，然后介绍了化学修饰电极的制备和类型以及表征方法，着重综述了功能化硅胶和聚合物修饰电极的制备方法及其在电分析化学中的应用。

The first polymer particles have a glass transition temperature in the range of from -20 DEG C.

该第一聚合物颗粒的玻璃化转变温度为-20至25℃。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。