Step Polymerization

Further Discussion on Two - Step Polymerization

关于二步聚合的进一步讨论

A new CAD software for caprolactam polymerization was reported . Its reliability was verified by the results from plants with single VK tube polymerization or two step polymerization .

介绍了己内酰胺聚合反应工程CAD软件包的建立，用工厂单VK管聚合和两步法聚合生产工艺验证了该软件包的可靠性。

The studied effects about the foaming control rheology by using monomer group . divide step polymerization and additive order , decide on three step polymerization technology in order ol MMA-St , MMA - Mz . and St-AN .

通过研究单体组合、分步聚合及加料顺序对发泡调节剂流变性的影响，确定了按MMA-St、MMA-Mz和St-AN的三步聚合工艺。

The whole process of the polymerization included nucleophilic addition , proton transfer and step reaction polymerization .

整个过程为亲核加成-质子转移-逐步聚合过程。

Aromatic polyureas were synthesized from 4,4 ′ - diphenylmethane diisocyanate and m-phenylene diamine by two step solution polymerization .

采用4,4′-二苯甲烷二异氰酸酯（MDl）和间苯二胺为单体，经两步法溶液聚合制备了芳香族聚脲。

Second , using the traditional step of polymerization , is difficult to prepare a large size latex particles , leading to its toughening effect of the alloy is not very satisfactory .

其次，采用传统的一步乳液聚合，很难制备出大粒径胶乳粒子，导致其增韧PBT/PC合金效果不是很理想。

It is made up of such eight modules as an introduction , radical polymerization , radical co-polymerization , ionic polymerization , coordination polymerization , the preparation method of chain polymerization , step reaction polymerization and chemical reaction of polymers .

它由八个模块组成，即绪论、自由基聚合、自由基共聚合、离子聚合反应、配位聚合反应、连锁聚合实施方法、逐步聚合反应、聚合物的化学反应。

It is the reverse of the propagation step in addition polymerization .

这一过程是加聚反应历程中链增长步序的逆过程。

A kind of rigid polymer microsphere with core shell structure was synthesized by multi step composite emulsion polymerization technique .

通过多步复合乳液聚合方法合成了一种具有核壳结构的刚性聚合物微球。

Research on the Interlinkage Mechanism among the Stages in the Athlete s Overall Perennial Training Process ; It is the reverse of the propagation step in addition polymerization .

运动员全程性多年训练过程中的区间链接机制这一过程是加聚反应历程中链增长步序的逆过程。

The conditions in the second step of seed polymerization were : emulsifier / seed latex less than l0.2 % , seed latex / monomer less than 5 % , polymerization temperature 60 ~ 70 ℃, and polymerization time 3 ~ 5h .

第二步种子聚合条件：乳化剂用量／种子胶乳量不大于10.2%，种子胶乳量／单体用量小于5.0%，聚合温度60～70℃，聚合时间3～5h。

The relationship between Guan distribution and Poisson distribution of molecular weight of polymers has been given by moment analysis , which is the first step for inferring the polymerization mechanism from molecular weight distribution of addition polymer .

本文通过矩数分析给出了Poisson分布与三参数指数型分布的关系.这是由加聚物买验分布推断反应机理的初步尝试。

Unmodified titania is too hydrophilic to stabilize initial droplets , which induces homogeneous nucleation and the formation of solid spheres . The stabilization effect of titania works step by step during polymerization .

未改性二氧化钛由于过度亲水不利于稳定初始液滴，在聚合过程中会发生液滴的瓦解，只能通过水相成核得到聚苯乙烯实心微球，二氧化钛的稳定作用是在聚合过程中逐步实现的。

METHODS The albendazole polybutycyanocrylate nanoparticles ( ABZ PBCA NP ) were prepared with one step , two step and three step emulsification polymerization respectively .

目的优化乳化聚合法制备阿苯达唑聚氰基丙烯酸正丁酯纳米球的处方工艺。