查询词典 polymerization

The development of high-performance rubber and nanoporous functional polymer materials started a new field of application of anionic polymerization.

高性能节能橡胶和各种纳米孔状功能聚合物材料的发展给阴离子聚合提供了新的机遇。

Due to the importance of anionic polymerization in polymer ,the dynamics was also discussed by statistics method.

鉴于阴离子型聚合在高分子科学中的特别地位，本文也用了聚合反应的统计理论对本实验体系的动力学与分子量分布进行了初步探讨。

The results showed that in this system, the relatively low temperature(70℃) was required in order to avoid the side reaction and to carry out the living anionic polymerization of MMA.

结果表明，本实验体系中，在较低温度下(-70℃以下)才能有效地避免聚合过程中发生的副反应，实现MMA的活性阴离子聚合。

Methods of suitable antifoaming agents for suspension polymerization of PVC are analyzed as well as the influence of antifoaming agents on the properties of polyvinyl chloride resins produced by suspension process .

介绍了消泡剂消泡的机理和类型，分析了悬浮法聚氯乙烯生产中如何选择适宜的消泡剂，以及使用消泡剂后对悬浮法聚氯乙烯树脂质量的影响。

Propylene polymerization with cat246 and cat24 was carried out, and atactic polypropylene was obtained.

以cat246和cat24为催化剂，催化丙烯聚合，得到了无规产物。

Only a single glass transition temperature appeared in the dynamic mechanical spectra indicating atactic copolymers were obtained.The tensile strength and water resistance are higher than those of samples parpared by conventional emulsion polymerization method.

三元共聚物在动态粘弹谱图上只出现单一的玻璃化转变温度峰，是完全的无规共聚物，拉伸强度明显大于常规乳液聚合方法得到的聚合物，耐水性也得到显著提高。

In the inductive period of the polymerization, the rate is proportional to the second power of the potential, but in the autocatalytic period, the rate is only proportional to the potential.

在一系列的聚合电位下制备了聚苯胺修饰电极，得到聚合电位与PA膜电化学性质的关系，达到通过控制聚合电位来得到不同电化学性质PA膜的目的，为PA膜研究中聚合电位的使用提供了较为系统的数据。

For the investigation of LC cells, this research focus on the surface analyses by suing SEM, both of the morphologies caused by various photo-polymerization conditions (various intensities of UV light and the presence of electric fields) and the effects of morphology on the electro-optical properties will be surveyed. The beadlike morphology was obtained from photo-crosslinkable monomer B-ThBiPhC6Ac 2,5-Bis-[4-(6-acryloyloxy-hexyloxy –phenyl ]-thiophene.

照光聚合单体 B-ThBiPhC6Ac 2，5-Bis-[4-(6-acryloyloxy -hexyloxy-phenyl]-thiophene 在照光聚合后其高分子形成颗粒状的形态，而化学结构与前者相似的单体B-TrPhC6Ac 4，4''-Bis-(6-acryloyloxy-hexyloxy-m-terphenyl，仅后者的中心化学结构改为苯环，由其 SEM 图可以看出其高分子的形态改变为颗粒状和纤维状。

In the three systems, system realizes the crosslinking of PVC bases on the peroxide crosslinking mechanism, the tensile strength of crosslinked PVC has been improved somewhat, the IR spectrum of gel demonstrates that there are characteristic absorption peaks of n-alcohol that belongs to ethanol amine and benzenoid group. From the analysis of gel structure , deduces that the mechanism of crosslinking reaction: under the initiations of peroxide and high temperature, PVC yields macromolecules free radicals, at the same time , styrene"s polymerization and grafting onto PVC takes place, at last the system forms crosslinking structure through coupling between radicals; confirms that triethanol amine can absorb HC1 produced by degradation of PVC, so improves the crosslinking efficiency of peroxide, decreases the HCl"s promotion for PVC"s degradation; deduces that triethanol amine can activate the PVC macromolecules and prolong the free radicals" life-time of PVC macromolecules; the effect to the PVC macromolecule makes styrenes graft reaction easy, and thus improves the crosslinking efficiency.

三种体系中三乙醇胺/过氧化二异丙苯/苯乙烯体系基于过氧化物交联机理实现了聚氯乙烯的交联，聚氯乙烯交联后拉伸强度有一定提高，凝胶红外光谱分析证实了凝胶结构中含有乙醇胺的伯醇基团特征吸收和苯环的特征吸收，由凝胶结构分析，推断出交联反应的机理：聚氯乙烯在过氧化物和热作用下产生大分子自由基，苯乙烯在过氧化物和大分子自由基的作用下发生聚合和接枝反应，最终通过自由基之间的偶合产生交联；证实三乙醇胺可以吸收聚氯乙烯分解产生的HCl，提高了过氧化物的交联效率，消弱了HCl对聚氯乙烯降解的促进作用；推断三乙醇胺可以活化聚氯乙烯大分子并有可能使聚氯乙烯大分子自由基存在的时间得以延长，对聚氯乙烯大分子的作用使苯乙烯的接枝反应易于发生，从而提高了交联效率。

A new series of Ni complexes [NiBr2] bearing bidentate amino-oxazoline ligands have been synthesized and applied for polymerization of styrene.

系列新的胺基-恶唑啉双牙配位基及其镍金属错合物，[NiBr2] 4，已被成功地合成出来，并且可应用在苯乙烯的聚合反应上。

The objective is to subjugate and discourage the people, because that allows the elite to continue to rule unopposed.

其目的是压制和打击人民的积极性，因为这可以让实权派继续统治不会沦为反对派。

GOD,this is the second time you vanquished me!

天啊，这是第二次你打败了我！